Malicious PDF — malware analysis report

Static analysis result for SHA-256 3f2e70ddb35a363d…

MALICIOUS

PDF

88.0 KB Created: 2021-07-01 00:24:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: d4ed9bac4773d9f5f3a79111747ed6c1 SHA-1: 67a19e0ebc472651376e3f2c8823de91bf9724df SHA-256: 3f2e70ddb35a363d526acfaa99c6fbe042ef43950b6a7bf35d4039bba7b8a33f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF identified as malicious by ClamAV and an ML classifier. It contains numerous URLs, many pointing to compromised WordPress sites, suggesting a link farm designed to lure victims. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports this. While no scripts were explicitly extracted, the nature of the embedded URLs and the detection as a phishing trojan indicates a likely attempt to redirect users to malicious or phishing content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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
  • 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 http://baanpowertrain.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c73fda08ba---pilejogubaz.pdf In PDF document text
    • https://massagetheory.ca/wp-content/plugins/super-forms/uploads/php/files/59003112fba790ad3872fc2297106e4f/84606066117.pdfIn PDF document text
    • https://www.avantagesapp.com/uploads/files/81225513033.pdfIn PDF document text
    • http://www.socalgreatwhite.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607dff1964b95---zefurifir.pdfIn PDF document text
    • http://danies.ru/ckfinder/userfiles/files/26146848852.pdfIn PDF document text
    • http://trenermichal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160c2ea417de3a---45569996842.pdfIn PDF document text
    • http://lightningriskassessment.com/ci/userfiles/files/perazebofokuvavajetaw.pdfIn PDF document text
    • http://stroynerud-sm.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160c8fc13d1a78---bufumerojene.pdfIn PDF document text
    • http://www.julitolaschools.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d7ddab2ecee---917419815.pdfIn PDF document text
    • http://akkoryazilim.com/userfiles/file/pivisamugi.pdfIn PDF document text
    • https://yarsan.ru/wp-content/plugins/super-forms/uploads/php/files/c26cb73a8d722f153b9a3f71da57ef2c/fifovodiwamu.pdfIn PDF document text
    • https://landlorddebtadvisory.com/wp-content/plugins/super-forms/uploads/php/files/cqni2onitrhqbm3rrfauma5316/ximutobiroruzurunaz.pdfIn PDF document text
    • https://www.sehersirin.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b8cf2201fb---7326049635.pdfIn PDF document text
    • https://emilline.dk/ckfinder/userfiles/files/vakavenelukozexoxanixanog.pdfIn PDF document text
    • http://share-world.tw/userfiles/file/35761032988.pdfIn PDF document text
    • http://mispuntossaga.com/campannas/file/7564038315.pdfIn PDF document text
    • https://isleo.com/i_photos/file/4396604291.pdfIn PDF document text
    • https://asi-filter.pl/files/file/fasimuv.pdfIn PDF document text
    • https://sweetestspaparty.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d9d957b007---bifonixezibijeg.pdfIn PDF document text
    • http://tamker.hu/userfiles/file/tebofonixej.pdfIn PDF document text
    • http://dentherapia.hu/files/file/xozidomifipepujuwej.pdfIn PDF document text
    • http://chinalabware.es/d/files/40684214467.pdfIn PDF document text
    • http://www.bestlifepolicy.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608cd24c8cd51---56815453869.pdfIn PDF document text
    • http://akcjonariusz.com/UserFiles/file/1351625823.pdfIn PDF document text
    • https://unique.global/wp-content/plugins/super-forms/uploads/php/files/d994a0894ccb64dd17c6e2e7aba2aff6/17084394740.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=national+lampoon%27s+favorite+deadly+sinsPDF 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_off0000f30c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF30C 17648 bytes
SHA-256: c5ce44457de66a11d24d5912dcf63260ed0bbcfec26c87b87459842fc98b7fc2
font_01_sfnt_off00012182.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12182 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013999.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13999 10848 bytes
SHA-256: 0eba1d3db91b5c44420247d3c26a83e2388f6ef2194711eb03261bbaafdd83ea