Malicious PDF — malware analysis report

Static analysis result for SHA-256 f56ef9bb430d45b0…

MALICIOUS

PDF

83.4 KB Created: 2021-06-25 15:31:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: c467332032a6587be9ac54de4c8a18c0 SHA-1: 7cd99647f6761b8d3c19b09c4464fdbb831c9ec3 SHA-256: f56ef9bb430d45b0189954d325165d7629f522c7902afb160cf12f8741a04943
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as a link farm, directing users to numerous external URLs hosted on compromised CMS uploads and disposable domains. The ML classifier and ClamAV also identified it as malicious, likely a phishing or malware distribution lure. Although no scripts were explicitly extracted, the nature of the link farm suggests an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://mebelpozakazu.ru/wp-content/plugins/super-forms/uploads/php/files/78e8295d1e7b50c5352147e853f3ed3d/turuwixaxejurozojizuwuve.pdf
    • https://www.higher-energy-trampolineclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/160715549f0004---31531381427.pdf
    • http://festivaldeliteraturadepereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099895118c80---92348583998.pdf
    • http://ahcxdq.com/uploads/file/20095142694.pdf
    • http://opalbiosciences.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095ff2a4cc14---vatoxukepij.pdf
    • http://www.itbaloch.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b420592d314---sirimobitupe.pdf
    • https://tavio.ru/files/file/75033784928.pdf
    • http://habitat3.eu/userfiles/files/75677221793.pdf
    • http://www.anieliasfx.com/uploads/textareas/file/47738412084.pdf
    • https://www.erenang.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608265bed824a---zugimepafegolo.pdf
    • https://www.budgetskemaet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16077330e61361---16103472838.pdf
    • http://drinkandshrink.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608d545316ab0---kinesuvarevutemagaboru.pdf
    • https://annjulieskarpmo.com/userfiles/file/2830905754.pdf
    • http://www.centralperdana.com/file/buxure.pdf
    • https://www.kadinlarsitesi.org/wp-content/plugins/formcraft/file-upload/server/content/files/16073f0a1b02db---tudegekariwoponuwomow.pdf
    • https://xn--64-mlcufjjaii0l.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/aecc3140d8eb28fd3f89c798483a6957/zekiboginusem.pdf
    • https://georgiamusicpartners.org/wp-content/plugins/super-forms/uploads/php/files/eaac17b5de88b296fcc51a18c84eb1ed/99979805692.pdf
    • https://performanceltg.com/wp-content/plugins/super-forms/uploads/php/files/2fdc94858042597e921a143d092e3c8f/tasoxiwijixoximabudijago.pdf
    • http://moon-villa123.com/CKEdit/upload/files/wewadato.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=rabindranath+tagore+love+poems+in+bengali
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000df33.bin
d3f98b22612c9c3623c6d2928f2aed84a974810803970bfad4c040502f001235
pdf-font-stream PDF embedded font (sfnt) at offset 0xDF33 11088 bytes
font_01_sfnt_off0000f872.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF872 16792 bytes
font_02_sfnt_off00011084.bin
6ed1c6df734509c7e3829170920e84052ea0a01d0f1fe8bd03b3d9060049390c
pdf-font-stream PDF embedded font (sfnt) at offset 0x11084 17252 bytes