Malicious PDF — malware analysis report

Static analysis result for SHA-256 0fc8f09dfdbcd6da…

MALICIOUS

PDF

72.2 KB Created: 2021-06-20 08:36:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-02
MD5: 95de57bd1cec0e89f423a4b9190ad1a7 SHA-1: 92b635a103df519f08f25ccc36f90a3ea6deb03a SHA-256: 0fc8f09dfdbcd6da5c8daabceaf662d52532151f5c6f1706c1761dfe535dc8ad
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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 https://readxyz.com/wp-content/plugins/super-forms/uploads/php/files/a90871dfa98c86c2fd9945f6df07ab6d/bilorokakezotawoxej.pdf In PDF document text
    • http://mesotects.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5f4f87ffdd---11701211863.pdfIn PDF document text
    • http://ufnk.fr/app/webroot/files/file/33446537444.pdfIn PDF document text
    • https://www.ideakliniksisli.com/wp-content/plugins/formcraft/file-upload/server/content/files/160878cb590a4b---punelipategaguvupozupuf.pdfIn PDF document text
    • http://innotack.com/userfiles/files/48570645460.pdfIn PDF document text
    • http://sip7.online/wp-content/plugins/super-forms/uploads/php/files/25545f9a4c7c5b5c1b388e43c37b9747/vimamera.pdfIn PDF document text
    • https://juhaszautovill.hu/userfiles/file/91371711732.pdfIn PDF document text
    • http://ackerviewguesthouse.com/userfiles/file/muzebefodedita.pdfIn PDF document text
    • https://dagvandearchitectuur.be/_files/file/voxodibaduz.pdfIn PDF document text
    • https://hmv.ir/wp-content/plugins/formcraft/file-upload/server/content/files/160a2f0529789f---44566642834.pdfIn PDF document text
    • http://agrobud.net/uploaded/file/70590461180.pdfIn PDF document text
    • https://sunwayhk.com/louis/STARKGROUP/ckfinder/userfiles/files/punipenezenogadapo.pdfIn PDF document text
    • https://aulacvn.com/upload/fck/file/87703256277.pdfIn PDF document text
    • https://www.bocamvigliesrooms.com/wp-content/plugins/super-forms/uploads/php/files/4edfe662de1b7739d3686ac238c7a208/tagagomapimepavovesu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=mushoku+tensei+worldPDF 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://scripts.sil.org/OFLIn 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_off0000c87e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC87E 4864 bytes
SHA-256: ad71b0570e628a2c837eae8cab5f9417dbadde86405d6ee1ea8a0cfe0d874507
font_01_sfnt_off0000d918.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD918 10964 bytes
SHA-256: 63349ca02e635fdd62b656469836b25a30617f2f36fd90cca669d1727206f864
font_02_sfnt_off0000feb9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEB9 16092 bytes
SHA-256: 39b2f4b99ee08965fd4836f89f628a00cde8346cb181131bba0308e80db8fb67

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