Malicious PDF — malware analysis report

Static analysis result for SHA-256 1cde80eefdff1251…

MALICIOUS

PDF

94.1 KB Created: 2021-07-20 05:45:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 32a977b8e2e6b2760f6d51e37d29d39f SHA-1: faf81e8984595fef43003cbe9bb3910ea4f9c028 SHA-256: 1cde80eefdff12514c556fdab63d628dc07bd3dcdfc052f6b9f06dc8b9ec94bd
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a high number of embedded links, many pointing to compromised WordPress upload directories and disposable hosting, indicating a link farm designed to distribute malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware delivery. No scripts were extracted, but the numerous URLs serve as the primary attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9786

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://www.rockandroll.blog.br/wp-content/plugins/super-forms/uploads/php/files/hp28311itj1ncj7iovjevs5mkm/64501936652.pdf In PDF document text
    • https://www.sevgiliyevideo.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a5b31d17205---zagasurupov.pdfIn PDF document text
    • https://choiceenergynetwork.com/wp-content/plugins/super-forms/uploads/php/files/cf1ee8dc85a2b83b002370950f875a78/nekoduwivurimisuf.pdfIn PDF document text
    • http://neodev.space/wp-content/plugins/formcraft/file-upload/server/content/files/160a1ec47cc4ac---bazepuwisikerisoxowinoj.pdfIn PDF document text
    • https://higher-reason.com/wp-content/plugins/super-forms/uploads/php/files/ikiv4lgkp13kuokvavbvpfcaou/67259202403.pdfIn PDF document text
    • https://www.fmworks.com.tr/wp-content/plugins/super-forms/uploads/php/files/n0r8eo0bb5dulgm2n5p2cijsts/77102757614.pdfIn PDF document text
    • https://sonntag-immobilien.lu/userfiles/files/pibawazavikakafurimikirok.pdfIn PDF document text
    • http://ambulatorioveterinarioilghirlandaio.it/userfiles/files/mefowunukoxanel.pdfIn PDF document text
    • http://michelesherrinlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/totusepowalurazupexo.pdfIn PDF document text
    • https://burstallconrad.com/editor_files/file/rokosujekinabojokexowose.pdfIn PDF document text
    • http://centralgiving.com/media/userfiles/file/mejota.pdfIn PDF document text
    • https://limpjet.com.br/wp-content/plugins/super-forms/uploads/php/files/bbe6c91ceac8c4dae3159e8e4b68fff5/lejafojidomajorodewa.pdfIn PDF document text
    • http://topcudental.com/img/userfiles/files/51879308297.pdfIn PDF document text
    • http://brilspa.ro/userfiles/file///papaguxis.pdfIn PDF document text
    • https://flycam.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1608b340abcb9b---18196186222.pdfIn PDF document text
    • https://www.arphplumbing.co.uk/wp-content/plugins/super-forms/uploads/php/files/ok0ha8ni8n8tv7rdpcbs2u33mt/vadofebolixalo.pdfIn PDF document text
    • http://techscreening.com/userfiles/files/2860960317.pdfIn PDF document text
    • https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/72a4f391a133eb006e9de99a261b6b7e/21483981465.pdfIn PDF document text
    • https://bookatowncar.com/userfiles/file/jaxibameku.pdfIn PDF document text
    • http://www.alexgis.com/siteuploads/editorimg/file/2557183629.pdfIn PDF document text
    • https://trichynext.com/wp-content/plugins/super-forms/uploads/php/files/cb33897f35581940bdf97fdcd792be67/33024200178.pdfIn PDF document text
    • http://www.segurosfacility.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c18f07d8003---26738580476.pdfIn PDF document text
    • https://joyfool.art/wp-content/plugins/super-forms/uploads/php/files/fcf592700bd4771407dbbc3bfea920b6/ragifaxega.pdfIn PDF document text
    • http://otelm4b.ru/admin/ckfinder/userfiles/files/29074570394.pdfIn PDF document text
    • https://schmitz.cz/res/file/webuk.pdfIn PDF document text
    • https://noukos.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16083d6bf25ca1---1196190757.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=sidney+crosby+and+nathan+mackinnonPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f48f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF48F 11012 bytes
SHA-256: 1d240f8e7246c0751b5cff6693c110ad64d6e8ab7a3d544f61965455edce5393
font_01_sfnt_off00010dfa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DFA 16544 bytes
SHA-256: 66b7945b99a9c78025a9a0ace4161995b24b08b80ea391fd428eddc3553bac27
font_02_sfnt_off000124bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124BD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00013ccf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13CCF 18000 bytes
SHA-256: a3cb1ce03c32cb4f483542cec7ac20b5eb5176789cf06f67af46232b224bc09f

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