Malicious PDF — malware analysis report

Static analysis result for SHA-256 fa7b3a441fb7cff8…

MALICIOUS

PDF

81.9 KB Created: 2021-09-05 09:06:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 9eaddee962e3655562220a2a4837dcba SHA-1: 2781a4c5a922ba4b56b8684123f59a3364708aa2 SHA-256: fa7b3a441fb7cff85ebe9a6034246ab637cd9008e53dc431512e3d68211e8d53
156 Risk Score

Malware Insights

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

The PDF contains numerous external URIs and link farms pointing to compromised websites, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The file's structure and content align with a malicious link farm designed to lure users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://irlanc.ru/uplcv?utm_term=mobile+cell+phone+repairing+pdf PDF link annotation
    • http://ithaca1962.com/clients/41687/File/50318278305.pdfIn PDF document text
    • http://tuanlongland.com/upload/files/tamepasepaniruxuganan.pdfIn PDF document text
    • https://webtraffic.ch/wp-content/plugins/super-forms/uploads/php/files/4naiqpev5vgkab0qn5o4qev0pn/saseze.pdfIn PDF document text
    • https://aymexco.eu/ckfinder/userfiles/files/livosilizuxufazules.pdfIn PDF document text
    • https://www.axelendinggroup.com/wp-content/plugins/super-forms/uploads/php/files/c2ed362476e142fdb68d4b6b6bf90e00/tofifajome.pdfIn PDF document text
    • https://mebelpozakazu.ru/wp-content/plugins/super-forms/uploads/php/files/118d50fa9f54deeabdb7b19dad9c33f0/xoligel.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/6plvt74ipu9ujbjq8dmas6adc3/38102191202.pdfIn PDF document text
    • http://www.melodypods.com/wp-content/plugins/formcraft/file-upload/server/content/files/160847ac13e49f---9340408219.pdfIn PDF document text
    • http://haiphongcontest.com/images/files/webigavaxa.pdfIn PDF document text
    • http://www.mueblesgamez.com/ckfinder/userfiles/files/wubuvilefuteduxaxes.pdfIn PDF document text
    • http://oneself.pro/wp-content/plugins/formcraft/file-upload/server/content/files/160a4992b958f8---gediputoga.pdfIn PDF document text
    • http://baharemadinah.com/wp-content/plugins/formcraft/file-upload/server/content/files/161012e9f5c43a---9114259768.pdfIn PDF document text
    • http://tao-ssct.org/data/upload/file/38361041983.pdfIn PDF document text
    • https://www.criteriainvest.com.br/wp-content/plugins/super-forms/uploads/php/files/e3ur825vu76t8lko0fof835tsd/56436967910.pdfIn PDF document text
    • http://www.orhancoskun.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f3509e9615---ximepofeminulidesebiz.pdfIn PDF document text
    • http://www.segurosfacility.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160dd6d2ef1d1c---benegoxo.pdfIn PDF document text
    • http://3gr-group.com/ci/userfiles/files/denotuxesarisubu.pdfIn PDF document text
    • https://inlandautorepairmurrietaca.com/wp-content/plugins/super-forms/uploads/php/files/763d00be67a10990ddc41e4432535c85/36588548866.pdfIn PDF document text
    • http://toanlinh.vn/upload/files/wolodusuporatap.pdfIn PDF document text
    • https://sbufficio.it/file/22178080863.pdfIn PDF document text
    • http://ktcyy.com/ckfinder/userfiles/files/81987787485.pdfIn PDF document text
    • https://madeinstlucia.com/userfiles/files/tesonanilotivipuvom.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_off0000d8cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8CD 18988 bytes
SHA-256: 5787c5e099a3d724c26f2811aaabef46395721a8dbb9317a3cfd2936c146c2b6
font_01_sfnt_off00010996.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10996 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000121ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121AD 10764 bytes
SHA-256: c872fd438c729698ef9ac863c4bf9fe71f87baed0558a7374c48f5b81c0d0920

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