Malicious PDF — malware analysis report

Static analysis result for SHA-256 70f73a1c1a623a1b…

MALICIOUS

PDF

87.9 KB Created: 2021-09-01 20:45:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: b134e4bcf3e9fddbe5564db6c4ea2e9f SHA-1: b3bf376cdfbb3a0d588eb86bafe686fd316c4a1a SHA-256: 70f73a1c1a623a1b2b341798f49d552d61cec1b893236fc1b8ef9aa3628d755d
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file flagged by ClamAV as a phishing trojan. It contains embedded JavaScript and numerous external URIs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://www.horisunmauritius.com/wp-content/plugins/super-forms/uploads/php/files/03429b0df5e33a5de55ed1f9aeca2714/dedetodeguxo.pdf In PDF document text
    • https://kipass.fr/userfiles/file/80223427189.pdfIn PDF document text
    • http://bigandtallking.com/userfiles/file/sisurexivavufulelixinijad.pdfIn PDF document text
    • https://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/b935e8a715c2ceef8cac9692d8d49d64/46006157683.pdfIn PDF document text
    • https://ambalatender.com/upload/files/rusudediwe.pdfIn PDF document text
    • http://paintmaster.hu/js/ckfinder/userfiles/files/kuwujateviwora.pdfIn PDF document text
    • http://ropesadventure.com/d/files/mogiravivinarek.pdfIn PDF document text
    • https://amigo-shop.105h.net/upload/files/89678898883.pdfIn PDF document text
    • http://hesexpo.com/img/editor/image/file/sonivuperif.pdfIn PDF document text
    • http://lhsclassof1971.com/clients/74120/File/48898938453.pdfIn PDF document text
    • http://cetinelektrik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160a5db2c0b19e---sipigud.pdfIn PDF document text
    • http://evabody.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160814aebbcfae---52639643905.pdfIn PDF document text
    • http://turagent007.ru/userfiles/file/81950302717.pdfIn PDF document text
    • http://baanpowertrain.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae8dd6b1686---duvexafi.pdfIn PDF document text
    • http://yuhenganquan.com/userfiles/file/20210616105153_249741003.pdfIn PDF document text
    • https://agrilaui.com/userfiles/file/24218223404.pdfIn PDF document text
    • http://qdcmd.com/data/files/87674758942.pdfIn PDF document text
    • https://www.officinadelgustoroma.com/wp-content/plugins/super-forms/uploads/php/files/1a88e8ea90110e642618ca175bc0fd34/bikisepibopoped.pdfIn PDF document text
    • https://functionalmovement.gr/wp-content/plugins/super-forms/uploads/php/files/259ce431668404e45606881e2fe6e326/65941270617.pdfIn PDF document text
    • https://plswa.com/wp-content/plugins/super-forms/uploads/php/files/9ffef1cdad48f605605647dda482e662/48721735930.pdfIn PDF document text
    • https://universal4shipping.net/userfiles/file/zekuwo.pdfIn PDF document text
    • http://www.optionassurance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160845fb68a219---fifipimab.pdfIn PDF document text
    • http://sochistandart.com/ckfinder/userfiles/files/xowekika.pdfIn PDF document text
    • http://jamoncup.es/wp-content/plugins/formcraft/file-upload/server/content/files/16105890a98e00---52997983439.pdfIn PDF document text
    • http://www.farparts.cl/wp-content/plugins/formcraft/file-upload/server/content/files/16081db436964f---48472425293.pdfIn PDF document text
    • https://www.officinadelguIn macro / runtime command snippet
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=domain+range+and+codomain+of+functionPDF link annotation
    • 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_off0000ea91.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA91 20548 bytes
SHA-256: d4de49700cf4770d776674427493c36b2b5fb97914c63dc2696d6239278de31f
font_01_sfnt_off00012089.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12089 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000138a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x138A0 10708 bytes
SHA-256: 4a8f2299e3502d8951a909975576e49ad77b217c45feeb3703f0c896d8adb6dc

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