Malicious PDF — malware analysis report

Static analysis result for SHA-256 c31b895e9662d68c…

MALICIOUS

PDF

82.1 KB Created: 2021-09-06 08:07:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 032eb35cc0e3fd77f19805ae63b24720 SHA-1: c7af96416ae44d23c9f4ced2229c611ee7152f99 SHA-256: c31b895e9662d68ce0f993171e7e2387ac184be966e8e27a017832b313eec9ce
156 Risk Score

Malware Insights

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

The PDF was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains a link farm pointing to compromised WordPress upload directories, suggesting a phishing or redirection attempt. The document body is unreadable, but the presence of numerous external links and the compromised hosting indicate a malicious intent to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://svenstavik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607acf56d3a7e---56214015586.pdf In PDF document text
    • https://areshin.ru/wp-content/plugins/super-forms/uploads/php/files/31368f6564966d9ef1a02305502d2fe7/77345151665.pdfIn PDF document text
    • http://www.argentum.com/wp-content/plugins/super-forms/uploads/php/files/efuo5pkfl4r8la7lo7n0p7c72u/34213725664.pdfIn PDF document text
    • http://www.skupp.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1607179a8452e1---1774678550.pdfIn PDF document text
    • https://lea-inc.com/wp-content/plugins/super-forms/uploads/php/files/95e00a46fb9dd77d6e96c22b065350ca/95953101436.pdfIn PDF document text
    • http://luatsutiengtrung.com/app/webroot/uploads/files/97822973753.pdfIn PDF document text
    • http://intechsol.kz/wp-content/plugins/formcraft/file-upload/server/content/files/160aa46084fe23---17898923489.pdfIn PDF document text
    • http://koddous.com/userfiles/file/witejusexima.pdfIn PDF document text
    • http://www.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e13337fbcf---75657115147.pdfIn PDF document text
    • http://recamonde.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b8b98971bf1---peperenapapaxixuteraf.pdfIn PDF document text
    • http://topopentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a0a0659ab2---57905580691.pdfIn PDF document text
    • https://vidolamerica.org/wp-content/plugins/super-forms/uploads/php/files/bcc394b71b865d7612f633b44df6e671/mabuma.pdfIn PDF document text
    • https://www.justgym.co.za/wp-content/plugins/super-forms/uploads/php/files/bbcngb9cl3klultrmanlgs2ea4/50486933562.pdfIn PDF document text
    • http://designerhouse.ru/upload/files/gezekoladalazipas.pdfIn PDF document text
    • http://sbnjl.com/userfiles/files/komemiribexusupoxilaropul.pdfIn PDF document text
    • http://abc-tel.ru/data/File/93986291535.pdfIn PDF document text
    • http://atya.eu/files/file/watirorodemu.pdfIn PDF document text
    • http://cy2hand.com/userfiles/56841461488.pdfIn PDF document text
    • http://xn----dtbsgbucafmmaf.xn--p1ai/servimages/editor/files/11803483053.pdfIn PDF document text
    • http://vector-mebel.ru/uploads/files/69503774684.pdfIn PDF document text
    • http://www.awakohchang.com/image/upload/File/8262764291.pdfIn PDF document text
    • http://miskolciharsona.hu/pictures/file/pegososukizowabalemis.pdfIn PDF document text
    • https://travelsafeway.com/userfiles/file/gizib.pdfIn PDF document text
    • http://yngc.ru/admin/ckfinder/userfiles/files/tomoxesewevuwumex.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=cours+sur+le+diagramme+de+gantt+pdfPDF 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_off0000d843.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD843 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f055.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF055 19208 bytes
SHA-256: 1560f148f0e1839f938f16fde9731cd8f81984bef8d1824892939fa77d0d2715
font_02_sfnt_off0001211e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1211E 10972 bytes
SHA-256: 09f8a4368cf8ce7155253e39fd366dbe08443548e3a1b3110e71923abc7693b6

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