Malicious PDF — malware analysis report

Static analysis result for SHA-256 379251b488cc1442…

MALICIOUS

PDF

94.0 KB Created: 2021-07-24 23:04:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: dd535a39838d8b47c7bd2d6d3a47e4d0 SHA-1: 1605a7c351623bc6bf61862dd32a13fe8edc5002 SHA-256: 379251b488cc1442239d27e4b90a5a0d71b223a41601b5e8f45973cac0a6941c
196 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 phishing or trojan threat. It contains a link farm pointing to multiple compromised WordPress sites and disposable hosting, suggesting an attempt to distribute malicious content or phish users. The presence of embedded URLs and the nature of the heuristics strongly suggest this document is designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

Heuristics 8

  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://joefairless.com/wp-content/plugins/super-forms/uploads/php/files/09da17164adcf64939b4feb14e69fb6c/27986688527.pdf In PDF document text
    • http://xn--e42bt3l.net/upfile/files/bafivanukufobemaruveje.pdfIn PDF document text
    • http://yetisirkaucuk.com/firma/files/55736342631.pdfIn PDF document text
    • http://www.jimenez-casquet.com/wp-content/plugins/formcraft/file-upload/server/content/files/160901e5e1019e---85012697351.pdfIn PDF document text
    • https://saraelv.no/wp-content/plugins/formcraft/file-upload/server/content/files/160a2e7116cddb---5060209509.pdfIn PDF document text
    • http://festivaldeliteraturadepereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc7083a0859---giremat.pdfIn PDF document text
    • https://777mto.com/contents//files/9530729511.pdfIn PDF document text
    • http://redwoodpwr.com/wp-content/plugins/super-forms/uploads/php/files/eg8rg63j6gpkvodd57acp36tn2/rumuviwozaroger.pdfIn PDF document text
    • http://elitaliaweb.it/upload/file/51233654169.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/9cc3149e9a95144efa526a4d785775fa/98488267924.pdfIn PDF document text
    • https://bravo-hk.com/userfiles/file/87191948754.pdfIn PDF document text
    • http://ampletrekking.com/userfiles/file/masefe.pdfIn PDF document text
    • https://muguet.fr/sites/default/files/file/viwesaninilugefene.pdfIn PDF document text
    • https://primewestelectrical.com/wp-content/plugins/super-forms/uploads/php/files/67da5cc96da5c11e4097eaf1f54b3765/20010388935.pdfIn PDF document text
    • https://psychotherapie-dr-albrecht.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609936b15626f---nabaj.pdfIn PDF document text
    • http://audiomaster.se/wp-content/plugins/formcraft/file-upload/server/content/files/160f1479100ff0---wonewurekunetapiruz.pdfIn PDF document text
    • http://asiavent.com/UserFiles/file///69486220405.pdfIn PDF document text
    • http://endustriyelkiralama.com/wp-content/plugins/super-forms/uploads/php/files/3j1le5e9hgpa6nlcvgvd6f233b/31682986205.pdfIn PDF document text
    • https://www.geosuiteonline.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608aac98c3187---88259829428.pdfIn PDF document text
    • https://prikolnaya.com/wp-content/plugins/super-forms/uploads/php/files/6a10e5ee1eaf63bad71846254ac6a16e/vagukujorigitotatafi.pdfIn PDF document text
    • http://www.allatpatikapecs.hu/images/file/44107022538.pdfIn PDF document text
    • http://engroupe.ca/aym_image/files/72353490815.pdfIn PDF document text
    • https://acornschoolcharleston.org/wp-content/plugins/super-forms/uploads/php/files/5c2cf7e499d23d5d5cfb39cce1f944c0/kekolisesuporude.pdfIn PDF document text
    • https://primax.fr/wp-content/plugins/super-forms/uploads/php/files/6mkjrtqrbjlhm18lig8biiiig6/figufali.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=what+is+captive+portal+login+on+android+phonePDF 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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010934.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10934 10852 bytes
SHA-256: cd7e9005a6ce9544bc5dccfe4540a165725cda77d7a7dae78e3ba4e1a41cecbf
font_01_sfnt_off00012209.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12209 17856 bytes
SHA-256: 8277c3ba123c730a313df6df6a3560843153f96ce7f5ba1ab84c17efe9cdac48
font_02_sfnt_off0001512f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1512F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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