Malicious PDF — malware analysis report

Static analysis result for SHA-256 ac42306d478fed44…

MALICIOUS

PDF

94.6 KB Created: 2021-08-12 07:48:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: ac9debf6e235092503651a3e58e04a1f SHA-1: b1a16453af0b628c5455cc0451b513b612061210 SHA-256: ac42306d478fed4470c8f9371e54781a180136b3d384d9c89c3d349b8ecaf01f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload storage or disposable hosting, indicating a link farm designed to mislead users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution via these links. No scripts were extracted, and the document body was unreadable, so the attack pattern is inferred from the URL structure and heuristic firings.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 6

  • 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 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 http://micronforgacsolo.hu/UserFiles/file/juzaj.pdf In PDF document text
    • http://for-rent-antwerp.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d42a85187e6---72771748551.pdfIn PDF document text
    • https://csom.cz/wp-content/plugins/super-forms/uploads/php/files/c1ad9f813200bb3962515ece3d1a900f/pitobu.pdfIn PDF document text
    • https://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b9eb055f06---70385021661.pdfIn PDF document text
    • https://airshow-bg.com/file/76750031077.pdfIn PDF document text
    • https://www.webplease.it/wp-content/plugins/super-forms/uploads/php/files/uughjslmmbbcicqqletfnuikec/ravabadisowedaxalemalo.pdfIn PDF document text
    • https://monuments-msk.ru/wp-content/plugins/super-forms/uploads/php/files/38d83ebc1f4fe96bb5d295db0f194b5f/bafefedevizavizumuxex.pdfIn PDF document text
    • http://greenberetrotcmedals.org/clients/e/ee/eef2f5edcbf7b69ea683240098563b39/File/zibew.pdfIn PDF document text
    • https://pomacanthe-art.fr/imagebeforeafter/files/midudimozitejubefiga.pdfIn PDF document text
    • http://benhvienlaptop.biz/userfiles/file/72530982091.pdfIn PDF document text
    • http://cohn-vossen.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610ec7b239a57---263057635.pdfIn PDF document text
    • https://numen-wow.com/userfiles/cloud//files/zugarirowozasamo.pdfIn PDF document text
    • http://rotang.net/userfiles/file/51238830749.pdfIn PDF document text
    • https://www.geo-decouverte.com/ck/ckfinder/userfiles/files/82819432341.pdfIn PDF document text
    • http://autoscuolepintozzi.it/userfiles/files/jivuwufasutoboxigoxo.pdfIn PDF document text
    • http://medicaldistri.com/ckfinder_files/files/jujipusekikiwemoninab.pdfIn PDF document text
    • http://hillsclinic.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/83236229150.pdfIn PDF document text
    • http://www.drop-lok.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084d1ff91d96---43651416246.pdfIn PDF document text
    • http://sm.ac.th/ckfinder/userfiles/files/82432318021.pdfIn PDF document text
    • https://www.breastcancerfoundation.in/wp-content/plugins/super-forms/uploads/php/files/907ebe1ac4fcca247db1e96886a909eb/bitubofawiwo.pdfIn PDF document text
    • https://www.kadinlarsitesi.org/wp-content/plugins/formcraft/file-upload/server/content/files/1606fb595c12a4---nibasizizeduged.pdfIn PDF document text
    • http://ejmk.com/ej/upload/files/jofowijabumimuwi.pdfIn PDF document text
    • http://www.zaluziemalina.cz/userfiles/file/29429728000.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=what+is+the+purpose+of+aggregate+planningPDF 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_off00010dfc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DFC 17828 bytes
SHA-256: ce57fd1b434b92f962d122293645188d60eb647136a8a908f920cb2d8391515a
font_01_sfnt_off00013c78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C78 10728 bytes
SHA-256: a05371875ad0db047f1e75484acb1412a17999dca6ce5b76e73eed8c607e1edc
font_02_sfnt_off00015515.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15515 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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