Malicious PDF — malware analysis report

Static analysis result for SHA-256 a76ee5229d116101…

MALICIOUS

PDF

75.2 KB Created: 2021-09-05 00:38:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 501a7a87b95c737d14c419e8d63ec306 SHA-1: 7187b6f08a6e14d3b3c8cf1653d0c0be16ec05a4 SHA-256: a76ee5229d116101f81fe36daa70a50aaf26713233e3c68f9fa591418a3c3820
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics as containing a link farm, with several URLs pointing to compromised CMS upload directories. The ML classifier and ClamAV also identified the file as malicious, specifically as a phishing trojan. Although no scripts were extracted, the presence of numerous links suggests an attempt to redirect users to malicious sites, likely as part of a phishing or content distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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 http://www.blackhillsdancecentre.com/wp-content/plugins/formcraft/file-upload/server/content/files/160919baa9cb42---rubutu.pdf In PDF document text
    • https://www.mii.net/wp-content/plugins/super-forms/uploads/php/files/4506a836f211c101d4aa8383280c34e2/2272908734.pdfIn PDF document text
    • https://inunekocp.jp/mailmagazine/upload/files/pezizunudupomuromineka.pdfIn PDF document text
    • http://akkoryazilim.com/userfiles/file/gurajogegasuna.pdfIn PDF document text
    • https://agrimal.pl/userfiles/file/zijajifugeganufusoraxovo.pdfIn PDF document text
    • http://gavinlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/23709672005.pdfIn PDF document text
    • http://chromowane.com/userfiles/file/fasaja.pdfIn PDF document text
    • https://brothers-music.com/ckfinder/userfiles/files/84270795793.pdfIn PDF document text
    • https://castilloexterior.org/ckfinder/userfiles/files/rekelag.pdfIn PDF document text
    • http://www.fashiongale.ro/userfiles/files/10066412408.pdfIn PDF document text
    • https://www.mobytec.com.br/mobytec/wp-content/plugins/formcraft/file-upload/server/content/files/1607f2558843a3---rugano.pdfIn PDF document text
    • https://777mto.com/contents//files/63966559197.pdfIn PDF document text
    • http://asu.com.vn/wp-content/plugins/super-forms/uploads/php/files/sp4marsan0sf8n5q4u7s30jo95/kavipitud.pdfIn PDF document text
    • http://ilovegabal.net/fckeditor/_upload/file/22458527433.pdfIn PDF document text
    • http://jockmurray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c9bba247ed0---sibutumepa.pdfIn PDF document text
    • http://livestreaming.group/wp-content/plugins/super-forms/uploads/php/files/jurnikr8cqjao5n3c8uq835ighiob25j/16657729171.pdfIn PDF document text
    • https://www.expoagrogto.com/wp-content/plugins/super-forms/uploads/php/files/i21vesfdof2a2do8mb8qcuhp42/7384732312.pdfIn PDF document text
    • https://www.aeap.com.br/ckfinder/userfiles/files/zesefadovelutiwoxozokuf.pdfIn PDF document text
    • http://traditionsradio.com/wp-content/plugins/super-forms/uploads/php/files/7nm5acu6earn88m77loi16rld5/81045017873.pdfIn PDF document text
    • https://www.dynasil.com/wp-content/plugins/super-forms/uploads/php/files/c1c1da5714aa15dd0eb58ba73adabf78/xipipalowesowuta.pdfIn PDF document text
    • http://tavernadelsnoguers.com/wp-content/plugins/super-forms/uploads/php/files/3bd5a1bed57cf942b43726dbae880eea/sujamovizitek.pdfIn PDF document text
    • https://mgogs.com/mgfiles/file/zizekivi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=baveja+parasitology+book+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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c212.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC212 16832 bytes
SHA-256: 943df911cb6676630b8b1689d21df9ecac96e36770d02d20bbc96de1d2445bcc
font_01_sfnt_off0000ed58.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED58 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001056f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1056F 11164 bytes
SHA-256: 5881078601aa0e64b09773e354a7b1033656aa07a534bd25c1a561acbc87cbf9

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