Malicious PDF — malware analysis report

Static analysis result for SHA-256 0f04cf23157bc310…

MALICIOUS

PDF

91.0 KB Created: 2021-08-09 15:59:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: e5651fe1b68cc52aeb2f6296a68eca38 SHA-1: 0057777096e84a9f79122c81416d2fb597fb7525 SHA-256: 0f04cf23157bc3106654327717e94d5ea70cd4eaedd0b2e8997729b5ef501203
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier indicating phishing and trojan activity. It contains numerous links to compromised websites, suggesting it's part of a phishing campaign or a distribution vector for further malware. The presence of external URIs and link farms on potentially disposable hosting further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://drafthe.ru/uplcv?utm_term=adobe+lightroom+cc+tutorial+pdf PDF link annotation
    • https://wscnaturalhealings.com/wp-content/plugins/super-forms/uploads/php/files/6f7b8bc4e2954b361ab9eabc63a58db0/mutofazomi.pdfIn PDF document text
    • https://xn----7sbabak5acz7byau.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/79a77cb5458e16ef9959c53d6ec2e3be/zanafapokaditanu.pdfIn PDF document text
    • https://bienenaktuell.com/sites/bienenaktuell.com/files/file/xejofa.pdfIn PDF document text
    • https://mandalaconfeccao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b285face737---mimafozawojakinulogomi.pdfIn PDF document text
    • https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/9e6c133db9caf3e0cceeb1f393d5ae13/rogubusekisizifakaxirak.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/7c8f8ab3141fc8027f52fa29c0984b16/mabufodoteriweru.pdfIn PDF document text
    • http://strategie-online.net/catalogue_dynamique/file/fepesagavanunakirufu.pdfIn PDF document text
    • https://churchosonline.com/wp-content/plugins/super-forms/uploads/php/files/69fb54d67c4cc75cfe54d53d228d25b2/sowerilifozuwowin.pdfIn PDF document text
    • http://weilandensemble.nl/ckfinder/userfiles/files/31658389767.pdfIn PDF document text
    • https://kisikana.hr/userfiles/file/58952983113.pdfIn PDF document text
    • https://voolabs.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dc1d1ae98ae---xibixilebupej.pdfIn PDF document text
    • https://newtech-utm.pl/userfiles/file/xesubosapexoniboxurez.pdfIn PDF document text
    • http://wib24-admin.de/uploads/file/35731065136.pdfIn PDF document text
    • http://udclassof1968.com/clients/74076/File/91686265947.pdfIn PDF document text
    • https://saftanton.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1608400b1ec97b---dokakapikinarofotibebivu.pdfIn PDF document text
    • https://sellos-mecanicos.com/wp-content/plugins/super-forms/uploads/php/files/732a5dbde64d647a7c50ac97af84eea4/32483159496.pdfIn PDF document text
    • https://mattweidnerlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160da25e562c9b---31523522587.pdfIn PDF document text
    • http://www.veronicaneal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/1609d12f9adb08---vipuzonubegamowime.pdfIn PDF document text
    • https://relleno-acidohialuronico.com/wp-content/plugins/super-forms/uploads/php/files/6f303fb7bd98c7db06b1bc079b56009d/kepubamik.pdfIn PDF document text
    • http://kazenergy.kz/wp-content/plugins/formcraft/file-upload/server/content/files/160786d30ec25c---bebijijel.pdfIn PDF document text
    • http://www.siphonicflowmandiri.com/upload/files/35013494161.pdfIn PDF document text
    • http://teraval.cz/res/file/vubojas.pdfIn PDF document text
    • http://accessiblevehicleservices.com/userfiles/file/lewizadevesulokegotebuxu.pdfIn PDF document text
    • https://unique-u.biz/images/uploads/file/dofilalanebamakakijufed.pdfIn PDF document text
    • https://olmitek.by/wp-content/plugins/super-forms/uploads/php/files/j4socbomgequm0pdd714un74k2/viniweberesodikirut.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ed0f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED0F 16956 bytes
SHA-256: 989053afba322dfbcbbd4b871cc7acf7ab2d3896a51d8eb5b4e7f983a19c6514
font_01_sfnt_off0001192d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1192D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013144.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13144 11016 bytes
SHA-256: 4dd3b31d652883fab4114352d42836e42c713803d5844a781307df4235d02306
font_03_sfnt_off00014a6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14A6B 5292 bytes
SHA-256: bb210a0e4c99644deee5d990342926c85d4bb6be10e76b5c8b4083658479d866

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