Malicious PDF — malware analysis report

Static analysis result for SHA-256 70e617d57a9b62f3…

MALICIOUS

PDF

90.5 KB Created: 2021-06-29 01:27:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 359dd952dcac1d4cfd76daf7d50912e4 SHA-1: a6127bb967e99c2b6d42f9e96f0702272cefe618 SHA-256: 70e617d57a9b62f3aeb41704c7b6e164e2de861909a65d14c755d21e345f5bc6
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many pointing to compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery. The presence of 'cmd9ruu6r9e/kuluzatotivapaviposele.pdf' and 'http://sts-logistika.' within the document text further supports the malicious nature of the links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • LOLBin token sequence in document text high SE_LOLBIN_RUN_COMMAND
    Extracted document text contains a Windows script/execution tool name (PowerShell, mshta, cmd, rundll32, regsvr32, …) within 220 characters of a dangerous flag, command verb, or URL. This is a visible 'run this' instruction in HTML/PDF/RTF lure bodies, or — in macro-laden Office files — the macro's own string-pool entries appearing adjacent in extracted text.
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://coretry.ru/uplcv?utm_term=good+brain+teasers+and+answers PDF link annotation
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609de122f3149---38742357202.pdfIn PDF document text
    • https://www.harasportcenter.com/wp-content/plugins/super-forms/uploads/php/files/unhv2a44j64md86aognrd753ra/26038207017.pdfIn PDF document text
    • https://askopenko.com/wp-content/plugins/super-forms/uploads/php/files/0ce2b4d1c4eb2cc1c280f5f1d0ce8be4/wimejazilog.pdfIn PDF document text
    • http://sharise.net/Uploadfiles/files/54061435362.pdfIn PDF document text
    • https://cosmopolitanhotelbg.com/uploads/wysiwyg/files/55501866936.pdfIn PDF document text
    • https://ifacemount.com/wp-content/plugins/super-forms/uploads/php/files/a0fmuigfgj12aidcmd9ruu6r9e/kuluzatotivapaviposele.pdfIn PDF document text
    • http://sts-logistika.ru/wp-content/plugins/super-forms/uploads/php/files/c45f8b4a3534fd786063943fdad6a0b0/fomibogom.pdfIn PDF document text
    • http://grani-tonkogo-mira.ru/wp-content/plugins/super-forms/uploads/php/files/3e66bc90c94bf8f31bf5285cf4d51574/18644176438.pdfIn PDF document text
    • http://eduomania.com/wp-content/plugins/formcraft/file-upload/server/content/files/160846aaa9100d---tugupevab.pdfIn PDF document text
    • http://xn--or3bi2da319p.com/upload/fckeditor/file/40972122079.pdfIn PDF document text
    • https://www.drserapkagan.com/wp-content/plugins/super-forms/uploads/php/files/bv6hqc4c5rc28lk4lclddea4k2/texuf.pdfIn PDF document text
    • https://siroyensao.com/upload/files/92487703276.pdfIn PDF document text
    • https://cosplay-expo.it/ckfinder/userfiles/files/90918408274.pdfIn PDF document text
    • https://claphamjunction.com.au/wp-content/plugins/super-forms/uploads/php/files/e2436000a6f57de0d4f309a8db2d8a32/95462257159.pdfIn PDF document text
    • http://kirks-pool.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609da8c73ebeb---99284923855.pdfIn PDF document text
    • http://www.hcibatiment.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1608191afeddf3---89794990746.pdfIn PDF document text
    • https://jaunimodienos.lt/wp-content/plugins/super-forms/uploads/php/files/rrhpulka7d71b6e7t1i603q91u/96398348612.pdfIn PDF document text
    • https://agilitynd.com/wp-content/plugins/super-forms/uploads/php/files/dc7e9467f9c83c3ebb9ec1ff0b0d25c2/56838465499.pdfIn PDF document text
    • http://lideparts.com/userfiles/file/1620933115.pdfIn PDF document text
    • http://lifemartrealestateconnect.com/wp-content/plugins/super-forms/uploads/php/files/8luapo0g3tenm5d0pj58358442/ripewasarataxeki.pdfIn PDF document text
    • http://juha.be/_files/file/numaniwevojiru.pdfIn PDF document text
    • https://forumhotel.by/wp-content/plugins/super-forms/uploads/php/files/4k3e012hpi736589so8q4075o2/66048059096.pdfIn PDF document text
    • https://finestblogger.de/wp-content/plugins/super-forms/uploads/php/files/701rimvp6oe02m6sl44707osfc/tozawagegipugap.pdfIn PDF document text
    • https://www.kadinlarsitesi.org/wp-content/plugins/formcraft/file-upload/server/content/files/16070974e37c75---gulamega.pdfIn PDF document text
    • https://www.a2zmedical.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1606ff8eba5e19---zuniworegerulidazifatu.pdfIn PDF document text
    • https://www.sacda.org/wp-content/plugins/super-forms/uploads/php/files/5msl9t9sn37ugnsbkeskvr1bf2/1499957712.pdfIn PDF document text
    • http://sts-logistikaIn macro / runtime command snippet
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001007d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1007D 16988 bytes
SHA-256: e6620ec69a766ba4edaee1b2b132aef6a9aa3a71cb83772e44d1fdf3cb81f777
font_01_sfnt_off00012c94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C94 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000144ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x144AB 10460 bytes
SHA-256: 75a81034bac7fff653c9fc06b90117bf404fee6411cc07365cc2c3f422f1310c

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