Malicious PDF — malware analysis report

Static analysis result for SHA-256 643b33df86a77f2a…

MALICIOUS

PDF

94.2 KB Created: 2021-06-30 21:05:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 0c10a813a6f5b8b753c8e08dfae193ee SHA-1: 556b5fdc1ac6a6da2cfc8c4ec5708cbc42068f00 SHA-256: 643b33df86a77f2ac232115baa7baf32159a96bbf98d802e75a735c1e7783c37
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links, many pointing to compromised CMS uploads, suggesting it's designed to lure users to external sites. ML and ClamAV detections confirm its malicious nature, specifically flagging it as a phishing trojan. The presence of link farm techniques and compromised hosting indicates a phishing or redirection attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9935

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://praward.tw/wp-content/plugins/super-forms/uploads/php/files/e39d785b2a3084804f8248295c53e02b/92964624024.pdf
    • http://bio86.fr/fichiers/ranir.pdf
    • https://hacunamatata.ru/wp-content/plugins/super-forms/uploads/php/files/db0cf0c0e8059fbca008952504367a93/78558341358.pdf
    • https://www.numberoneporthill.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607f9dbdad9f4---39401989164.pdf
    • https://wecafephuket.com/wp-content/plugins/super-forms/uploads/php/files/otrl90fl470861tpgj48dcekjm/31457950919.pdf
    • https://www.aironface.com/wp-content/plugins/super-forms/uploads/php/files/11fdb6fef6bbcfe6bb762fa919ce5c61/52457519388.pdf
    • http://graphicon.hu/wp-content/plugins/formcraft/file-upload/server/content/files/160a434e54ac21---navosulazilujetad.pdf
    • https://www.corridar.com/wp-content/plugins/super-forms/uploads/php/files/0leoje5g89fnu480ghaj4oif9j/wififoxalita.pdf
    • http://eau-msu.ru/ckfinder/userfiles/files/18222967698.pdf
    • https://kvgrup.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/160a6173c18783---zoxurinakigatijevuvede.pdf
    • https://118highschool.am/wp-content/plugins/super-forms/uploads/php/files/adbe694a54f5a2992d7229517957aa89/gibamuzet.pdf
    • http://www.apsetedavisi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070fea5906ba---mulerodifimeratezarog.pdf
    • https://rhythmcprandfirstaid.com/wp-content/plugins/super-forms/uploads/php/files/b3769ce742f1bfffcee2fb1137f13feb/kijawodup.pdf
    • http://roocenter.ru/upload/file/43053898550.pdf
    • http://asiavent.com/UserFiles/file///53270652107.pdf
    • https://drainscovers.com/wp-content/plugins/super-forms/uploads/php/files/6b1e2d7407e671393120505a42e5cb71/wotowudo.pdf
    • http://agnieszkapawlik.com/userfiles/file/tenigidofajafezavinopo.pdf
    • http://amadpich.com/userfiles/file/leridetazululenon.pdf
    • http://mijneigenlift.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608d17e6ada58---11840530809.pdf
    • http://pmdrecycling.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607080d7cc81d---94220257016.pdf
    • http://autoshiftbid.com/fckeditor/userfiles/file/7281718607.pdf
    • https://aplusadvance.com/naver_editor/data/file/wapaxe.pdf
    • http://wadirumshootingstars.com/userfiles/file///208811767.pdf
    • https://nothingbutsafetyglasses.com/userfiles/file/favixurugubeluvu.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=hearts+of+iron+4+cheats+country+tags
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001095a.bin
1958b6c43e0c829feb8270c41630b61e6b5b74f64687be2e7346b4754e05b2e6
pdf-font-stream PDF embedded font (sfnt) at offset 0x1095A 10852 bytes
font_01_sfnt_off0001226d.bin
1d3b983046e0c05733188e72af56754938ca9f461b496ca1913db8f85271b22f
pdf-font-stream PDF embedded font (sfnt) at offset 0x1226D 18776 bytes
font_02_sfnt_off0001537c.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1537C 16792 bytes