Malicious PDF — malware analysis report

Static analysis result for SHA-256 547c2b5688a3597e…

MALICIOUS

PDF

88.2 KB Created: 2021-08-10 06:22:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 2ad10537ee198b6cf89e37dd0a85b45c SHA-1: ed98c83bd615f794e9540136f97efe07a994af65 SHA-256: 547c2b5688a3597ed84a9f5c1a5e5365b77d214482c1a2384ca4fe04db9de615
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, with several pointing to compromised CMS upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further payloads via these links. The document body is heavily obfuscated and unreadable, providing no direct user-facing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://sportsht.com/userfiles/file/jasuzuzufowodareku.pdf
    • https://binarbaidequipment.com/public_html/userfiles/file/venitanovoxiveroruka.pdf
    • https://amesmedicalservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b622815be56---lopozikimuperoperuxe.pdf
    • http://namlongprojects.com/images/uploads/files/22778315512.pdf
    • https://paloaltospeakerseries.com/wp-content/plugins/super-forms/uploads/php/files/ca6054e2ef724bc394b9a4b3ac68d3d6/zejuxujifenopi.pdf
    • https://www.partyshuttlebus.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160911da5c8917---sovogeba.pdf
    • http://asja-doll.ru/userfiles/file/kubofejopegamovopifop.pdf
    • http://vegasoft.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160acb59a0f736---luxurogerapedomafaro.pdf
    • http://www.ibadirect.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088885f76c25---24000168397.pdf
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/160bd6dab8e66a---suvoxodojezog.pdf
    • https://wlao.on.ca/wp-content/plugins/super-forms/uploads/php/files/7e705be4d8d598742153a20daf2c1571/37961350495.pdf
    • http://korea-seals.com/ckfinder/userfiles/files/84791795566.pdf
    • https://kassa-evotor.ru/wp-content/plugins/super-forms/uploads/php/files/ld9vlv1iokl0knv9s3b85l62g1/liwagubiwok.pdf
    • https://vaytieudungtragop.com.vn/wp-content/plugins/super-forms/uploads/php/files/0lbf84s9ej231psjieolpia7hg/39150329170.pdf
    • https://mrdak.cc/uploadfile/files/zavetubexokuwakategino.pdf
    • http://kperrylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/78019447124.pdf
    • https://caribemed.com/userfiles/file/33241642150.pdf
    • http://nanoscopy.ru/uploads/files/voxomusawifesikaremaku.pdf
    • http://satisfytech.com/ck/upload/files/54719756088.pdf
    • http://global-gypsum.com/wp-content/plugins/formcraft/file-upload/server/content/files/160764c0696eb7---juxaludonobakuzojawejuw.pdf
    • http://roxburyhs1987.com/clients/63080/File/tinerukujagisegizuzipiw.pdf
    • https://www.hontoys.com.au/wp-content/plugins/super-forms/uploads/php/files/83d7qpmb7bd09h3ubre3r5f7hv/pijaxuzuwezivagududipad.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=how+can+you+see+yourself+20+years+from+now
    • 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_off0000f3bf.bin
60a2bd5496c2b11ac00c41e1a412c24dcbc5c8b8b722587449049657fe5681ea
pdf-font-stream PDF embedded font (sfnt) at offset 0xF3BF 17572 bytes
font_01_sfnt_off00012181.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12181 16792 bytes
font_02_sfnt_off00013998.bin
4af21e55a0b609e0fb9037e34ba66eca3b5d132c6989f1f10e94e2154990afe1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13998 10840 bytes