Malicious PDF — malware analysis report

Static analysis result for SHA-256 4cbd3be6c46647c3…

MALICIOUS

PDF

42.6 KB Created: 2021-06-26 05:48:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-27
MD5: fd9499ed1a12dafe699e1b83c11673a5 SHA-1: 4bfc35c7ec0698d87abcba61e186ffae35802d13 SHA-256: 4cbd3be6c46647c3fa4e8c6f8d7896f99fee76b1b77c7320e5904532eb3446b9
174 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document is identified as malicious by ML classifiers and ClamAV, exhibiting characteristics of a phishing lure. It contains a link farm pointing to multiple compromised CMS upload directories, suggesting an attempt to distribute further malicious content or phish for credentials. The document body is heavily obfuscated, but the presence of numerous external URIs indicates a strong likelihood of redirection to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7328

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
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 42 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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
  • 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://laborke.ru/uplcv?utm_term=miller+and+levine+experience+biology+the+living+earth PDF link annotation
    • http://1hozain.ru/files/userfiles/files/26282661137.pdfIn PDF document text
    • https://tootooair.com/FileData/ckfinder/files/20210614_B8404E1D1731D6AA.pdfIn PDF document text
    • http://www.maarsehoveniers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160be3080e09f3---wopizij.pdfIn PDF document text
    • http://diagonal.org.ar/wp-content/plugins/formcraft/file-upload/server/content/files/1607e1f21562eb---87922653695.pdfIn PDF document text
    • http://nd-58.ru/wp-content/plugins/super-forms/uploads/php/files/8f15fe6b5fa46bcc773fc696ce6c7d2c/6087631248.pdfIn PDF document text
    • https://www.helpfulhunks.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1609e48a57f836---rakuxizer.pdfIn PDF document text
    • https://regalcabs.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160754f8ec7081---45815397779.pdfIn PDF document text
    • https://givemeit.ru/wp-content/plugins/super-forms/uploads/php/files/aafb2f7cf584dfd7e0a03beb965edca8/89469757558.pdfIn PDF document text
    • http://reelproductionshd.com/userfiles/file/zegijepufegojenilesefog.pdfIn PDF document text
    • https://miamivanservice.net/wp-content/plugins/formcraft/file-upload/server/content/files/1608ba5e51ce2c---68729726180.pdfIn PDF document text
    • http://triumphtoday.org/wp-content/plugins/formcraft/file-upload/server/content/files/160861fa844e47---fusisunalopakagubedab.pdfIn PDF document text
    • https://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/67f1e4bec30614f3aa0d78fc05224584/pexurixifunexezim.pdfIn PDF document text
    • http://llux.vn/uploads/files/tivowukusadime.pdfIn PDF document text
    • http://clearlakesd.org/wp-content/plugins/formcraft/file-upload/server/content/files/160cc341c253fd---7957433302.pdfIn PDF document text
    • http://www.leesii.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c7c8d1f6a2---92443868789.pdfIn PDF document text
    • https://hojoairport.com/images/file/mufip.pdfIn PDF document text
    • http://kleinschaden.expert/userfiles/file/68412368797.pdfIn PDF document text
    • http://ciskmv.com/css/file/72832492124.pdfIn PDF document text
    • http://trenermichal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160834ae347581---wumunalu.pdfIn PDF document text
    • http://playeasypiano.com/resources/fck_images/49630789723.pdfIn PDF document text
    • http://accurateverdicts.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076c8206f842---xoxiwebudavik.pdfIn PDF document text
    • https://www.pharmaright.ca/wp-content/plugins/super-forms/uploads/php/files/p7u0c0vgsb70cm58tb2ifr7u4s/fovabirigagovirubibo.pdfIn PDF document text

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