Malicious PDF — malware analysis report

Static analysis result for SHA-256 ed3d23004ef9c72c…

MALICIOUS

PDF

87.7 KB Created: 2021-08-24 18:52:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: d6305a340767a5b01b81e7463ee3b500 SHA-1: f8624c74921fc88b6482dfccc3f817f43af815ca SHA-256: ed3d23004ef9c72cd065c80b735bb9c82cec17202fa6cb74715eb93f0f6f3c39
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The file contains numerous external URIs and links to compromised WordPress upload storage, suggesting it is part of a link farm designed to redirect users to malicious sites. The presence of 'utm_term' parameters in some URLs further supports a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9877

Heuristics 7

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://krisoc.ru/uplcv?utm_term=ccc+question+answer+in+english PDF link annotation
    • https://calldidocta.com/wp-content/plugins/super-forms/uploads/php/files/76ce1b0287b2e4dd334006ef3aa61193/pixajasutut.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/tm100of0oqmi8icijk7p1n1gd3/60255553507.pdfIn PDF document text
    • https://sv-fin.ru/wp-content/plugins/super-forms/uploads/php/files/a606b424da015dc9abb582efb453b1de/65591671593.pdfIn PDF document text
    • http://saigonford3s.com/uploads/2021-07-19/images/files/kelerinasebadisabamomor.pdfIn PDF document text
    • http://heilpraxis-pankow.de/wp-content/plugins/formcraft/file-upload/server/content/files/160945cfc2c884---6430102230.pdfIn PDF document text
    • https://martabaktelor.com/contents//files/mevek.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609df4ba8af73---nasotuwiweketamowek.pdfIn PDF document text
    • https://snqrsl.quebec/upload/editor/file/45809260004.pdfIn PDF document text
    • https://wacee.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607347ddd3c07---2885150270.pdfIn PDF document text
    • https://viboot.com/ckfinder/userfiles/files/xovilaxupirifirowifigip.pdfIn PDF document text
    • https://anzmrrn.org/wp-content/plugins/formcraft/file-upload/server/content/files/160d50848e1283---56905072116.pdfIn PDF document text
    • https://xn----7sbabak5acz7byau.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/6028277847da8cd1365e3e201a700c87/givojalu.pdfIn PDF document text
    • http://dinskayarealty.ru/media/file/jidugubakakupi.pdfIn PDF document text
    • http://raduzhniy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cfc5ec2f450---61503132952.pdfIn PDF document text
    • http://gzmzwl.com/Uploadfiles/files/94728064871.pdfIn PDF document text
    • https://www.lokalesichtbarkeit.de/wp-content/plugins/super-forms/uploads/php/files/rju1alv08nrdacnn7n2cb9hsvn/negepoxurilo.pdfIn PDF document text
    • http://bellezaeimagen.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/16098f0c40bdab---paletovapig.pdfIn PDF document text
    • http://ecohost.ru/pics/images/file/relowiladinegetojotin.pdfIn PDF document text
    • https://gegeny.hu/uploads/file/pisetabo.pdfIn PDF document text
    • http://accurateverdicts.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc68cbeb479---guganulavuvufagagew.pdfIn PDF document text
    • http://sartor.ru/upload/files/98111229844.pdfIn PDF document text
    • https://hinaweb.com/upload/file/nadoroladitiminekezorap.pdfIn PDF document text
    • http://aberdeeneyes.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160bd7bc205f0a---foloremabobijo.pdfIn PDF document text
    • https://walkandsmile.com/userfiles/file/46486371896.pdfIn PDF document text
    • http://szalkasszorutacskok.hu/app/webroot/files/content/files/38477027593.pdfIn PDF document text
    • http://besttailor.info/ckfinder/userfiles/files/tubuwopakibufomerojuz.pdfIn PDF document text
    • http://fcvperu.org/data/fcvperu/userfiles/file/42463631514.pdfIn PDF document text
    • 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_off0000f187.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF187 10872 bytes
SHA-256: d3aef16383f774227ab549b1a0771c7812cb00f1a9ac6ef335aca3dfd56aaea5
font_01_sfnt_off00010a6a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A6A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001227c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1227C 17180 bytes
SHA-256: 9b27d6b52cc5019a27e031e612604fb3fc7e6ed3b9e82fbf21be0f07d4db177b

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