Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc2fa64d2a8ab2cd…

MALICIOUS

PDF

94.5 KB Created: 2021-09-01 14:30:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 9df4dd38e6a1fb5a355c60b043f2a5d6 SHA-1: e6031447fd470a91d16ef9cc1193151a06dbe04a SHA-256: bc2fa64d2a8ab2cda74a4fd5d32f3653eddd2dd016ddcd41c61d3dd9c782f5c8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. Heuristics indicate the PDF contains a link farm pointing to multiple distinct hosts, many of which are compromised CMS uploads. While no scripts were explicitly extracted, the nature of the link farm suggests an attempt to redirect users to malicious sites, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://www.almuhja.com/ckfinder/userfiles/files/9937134718.pdf In PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ecd360befb1---2368569672.pdfIn PDF document text
    • http://exactblue.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9144a360a6---79893889576.pdfIn PDF document text
    • http://nensi.si/upload/file/raxobepegomefapewa.pdfIn PDF document text
    • https://cal.lighting/wp-content/plugins/super-forms/uploads/php/files/eae1cfbb946221c6f2dd3bf5b036980a/81721009076.pdfIn PDF document text
    • http://conniecorsentino.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/bazewewikalediwen.pdfIn PDF document text
    • https://laflammerouge.ch/userfiles/files/50799726277.pdfIn PDF document text
    • https://kalatranslation.co.uk/wp-content/plugins/super-forms/uploads/php/files/lu7tmccqojtsfaqkbekadvd5un/42308294498.pdfIn PDF document text
    • https://humantouchtranslations.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/16072c471ac9d7---pemag.pdfIn PDF document text
    • http://audidalys.lt/ckfinder/userfiles/files/66072777507.pdfIn PDF document text
    • https://rainbowprinter.com/app/webroot/files/file/forafevasa.pdfIn PDF document text
    • http://rogersdesignhouse.com/uploads/files/durolexinuseroliwun.pdfIn PDF document text
    • https://robinio.de/wp-content/plugins/super-forms/uploads/php/files/6me42nr6dj7jd7svdrs86aelia/17289570148.pdfIn PDF document text
    • http://amoy-art.com/Upload/file/vabonitezewesutevowateb.pdfIn PDF document text
    • https://petroblend.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073868f13bf3---90590378221.pdfIn PDF document text
    • https://chinese-wall.tw/upload/files/98799027883.pdfIn PDF document text
    • https://atlanthealth.com/wp-content/plugins/super-forms/uploads/php/files/851c5354d3fd1780dd4e52da45228d45/xonibesiraxifupako.pdfIn PDF document text
    • http://bygreenpure.com/userfiles/file/21631560517.pdfIn PDF document text
    • http://math-talk.kr/wp-content/plugins/super-forms/uploads/php/files/bdsseqs6003rhs2p5esic5cdr4/pebem.pdfIn PDF document text
    • http://pasted-radio.de/web/files/85901577912.pdfIn PDF document text
    • https://bowenpainter.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607247728940e---xinugujozurevapelado.pdfIn PDF document text
    • https://www.mybizwebsites.com/wp-content/plugins/formcraft/file-upload/server/content/files/16121aa9175015---63258422770.pdfIn PDF document text
    • https://castilloexterior.org/ckfinder/userfiles/files/15457950301.pdfIn PDF document text
    • http://lg-palette.com/upload/files/pusoderidoxatagu.pdfIn PDF document text
    • https://betonwerkendejonge.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c385702e045---wubaxukedikubusegamubovi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=stand+by+me+2019+full+moviePDF 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_off00010c86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C86 17376 bytes
SHA-256: 70956f502ceaf22f80e182e2460ffb2735165e9886a5be0f22f27e753c1d76fb
font_01_sfnt_off00013979.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13979 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00015190.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15190 11204 bytes
SHA-256: 53829b14d429167a010d2e98553061a3f62fd04268a2e7b93c3a35c39249d113

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