Malicious PDF — malware analysis report

Static analysis result for SHA-256 3e539fdbae6a6133…

MALICIOUS

PDF

73.7 KB Created: 2021-08-28 06:44:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: cb079c7668059d3b405adaaa3d82c0d7 SHA-1: 40f576ec50a5903443e9560fe69f8c9553b97d13 SHA-256: 3e539fdbae6a6133def23fe11a04af8455e7131cee977da9b9f913a2bc16d36b
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. The document acts as a link farm, directing users to compromised CMS upload storage and disposable hosting sites, which is a common tactic for distributing further malware or conducting phishing. The presence of embedded URLs and the overall structure suggest it's designed to trick users into downloading malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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.
  • 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 http://cedresarquitectura.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8b48eb2ecb---gutinu.pdf In PDF document text
    • http://drukarnia-warszawa.pl/pliki/file/85652682396.pdfIn PDF document text
    • https://siphouse96.com/wp-content/plugins/super-forms/uploads/php/files/c1d9198a643d9724e8ab067e296ceee8/lamegegurujazi.pdfIn PDF document text
    • https://yuktogel.com/contents//files/rimotajebetidamanikiwerar.pdfIn PDF document text
    • http://www.hj-bouwt.be/wp-content/plugins/formcraft/file-upload/server/content/files/1612782248fd45---71206682991.pdfIn PDF document text
    • https://bilegt.mn/userfiles/files/91070565184.pdfIn PDF document text
    • http://deborahkay.com/ckfinder/userfiles/files/56512766597.pdfIn PDF document text
    • http://reiki-roots.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc0bb52786---3943835136.pdfIn PDF document text
    • http://cwesp.biz/upload/file/43146583087.pdfIn PDF document text
    • http://shinies.ru/img/lib/file/binolikakumured.pdfIn PDF document text
    • https://serka.com/serka/upload/files/57447071724.pdfIn PDF document text
    • http://rund.cz/UserFiles/File/41405630862.pdfIn PDF document text
    • http://oiseau-bleu-morzine.com/userfiles/file/39608277429.pdfIn PDF document text
    • http://zoncmswebsitebeheer.nl/files/editor/file/14589332161.pdfIn PDF document text
    • https://masini-de-ambalat.ro/images/userfiles/74441829710.pdfIn PDF document text
    • https://vatlieutaphu.com/upload/files/41439047687.pdfIn PDF document text
    • https://www.a2zmedical.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a2f2199f13c---zekatinem.pdfIn PDF document text
    • http://st-johnson.com/Uploadfiles/files/rulinadawilulimolotip.pdfIn PDF document text
    • https://campermagazine.tv/public/file/34267319095.pdfIn PDF document text
    • https://magazinul-de-instalatii-sanitare.ro/app/webroot/files/userfiles/files/gozamuxoxorufajob.pdfIn PDF document text
    • http://amfmeg.org/wp-content/plugins/formcraft/file-upload/server/content/files/1606d81fead8fd---nidogirunuxufawugimowaf.pdfIn PDF document text
    • http://eotp.info/sites/default/files/fck/file/xadujejim.pdfIn PDF document text
    • https://stellabakingcompany.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d03e6c65183---fujanubarevurolewewuxita.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=great+table+topicsPDF 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_off0000bfda.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBFDA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d7f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7F1 10444 bytes
SHA-256: 381362373a886b25616026981548879c824b618016c3f8db68450d63d8e62bb3
font_02_sfnt_off0000ef89.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF89 16604 bytes
SHA-256: 8a89b22f3a6fd25ae72b933c282a3c91b258e483e9f08496071d888020dd2bb6

Open this report in the interactive analyzer, or submit your own file for analysis.