Malicious PDF — malware analysis report

Static analysis result for SHA-256 f2c6d1048ea8d6db…

MALICIOUS

PDF

78.1 KB Created: 2021-09-03 06:37:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: cb98e40050f045bcf7e379f13eb98d6d SHA-1: f220e49c572a6ab960ba4dfa0170fbee39d90a42 SHA-256: f2c6d1048ea8d6dbb3edf54539f419b5cd7ab67d80f7a80536f2d74def35ab62
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. Numerous URLs were extracted, many pointing to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users to phishing or malware sites. The presence of external URIs and link farm heuristics strongly supports a phishing or credential harvesting attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9958

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://synerhu.ru/uplcv?utm_term=anticancer+drugs+from+marine+sources+pdf PDF link annotation
    • http://computerdoki.hu/user/file/magegiweledut.pdfIn PDF document text
    • https://genesislighting.net/wp-content/plugins/super-forms/uploads/php/files/5c4a8649481b938a1a2a267b5e25fa9e/29892522058.pdfIn PDF document text
    • http://dzbnf.com/upload/file///daxamifomujewupebunaraje.pdfIn PDF document text
    • https://fedico.ca/upload/editor/file/82362874565.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/zixizipujalutiwedonigato.pdfIn PDF document text
    • http://ineke-ott.nl/keramiek-beelden-imagesfile/fugel.pdfIn PDF document text
    • https://livstyle.ro/home/livstyle/public_html/uploads/files/xapivudupukugusutokuve.pdfIn PDF document text
    • http://bizwd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607eed488a3f1---diborofujaxalumunoberusu.pdfIn PDF document text
    • http://drinkandshrink.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607e85f065162---nokodarajobalojikigun.pdfIn PDF document text
    • https://amatnieks.lv/pictures/image/suzarekopujinanotilotufal.pdfIn PDF document text
    • http://sazjah.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088d9fa66993---xewunibovogu.pdfIn PDF document text
    • https://forumhotel.by/wp-content/plugins/super-forms/uploads/php/files/8ib4ruvdcaov6ropjodbsi7pl2/dusonunat.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5ef8766f67---zifemizapazuno.pdfIn PDF document text
    • https://www.pferde-fuer-unsere-kinder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608c892ab7a25---zavon.pdfIn PDF document text
    • https://goodmix-psc.com/userfiles/files/roluwuvaliw.pdfIn PDF document text
    • http://africanhairbraidingsalon.com/userfiles/file/kubozofa.pdfIn PDF document text
    • https://fjordancv.info/wp-content/plugins/super-forms/uploads/php/files/679cf97cdeff0a24f45d05a2a2f99669/8592298622.pdfIn PDF document text
    • https://bursaceviritercume.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb6bbc20f38---fojoj.pdfIn PDF document text
    • http://isemya.by/modules/ariol/static/ariol/ckfinder/files/dadezuzugonid.pdfIn PDF document text
    • http://lambanghieuquangcaogiare.net/vietkiendo/upload/file/zesabumagesoz.pdfIn PDF document text
    • https://almuhja.ps/ckfinder/userfiles/files/kitasowukowum.pdfIn PDF document text
    • https://asiatravel.kg/wp-content/plugins/super-forms/uploads/php/files/3349c0bd690e705121ecd32d133774c5/82421073980.pdfIn PDF document text
    • http://lonerangerfanclub.com/ckfinder/userfiles/files/68679199510.pdfIn PDF document text
    • 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_off0000c7bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7BD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dfcf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFCF 18932 bytes
SHA-256: 5eaf61e3ba1c1e35e83cc021f4467613353ac6ab868a0fc9fe47d97128ab2915
font_02_sfnt_off00011161.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11161 11000 bytes
SHA-256: 605ad136e646f7637ee7daf7b4ba4762057d8f761d3d8e4ce66882b994e0f4ed

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