Malicious PDF — malware analysis report

Static analysis result for SHA-256 f6f21f14163c1a56…

MALICIOUS

PDF

92.7 KB Created: 2021-06-26 15:09:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: bf01719a212087d7d4bd20c6813e25d1 SHA-1: 019b747dd2880dee97516ed9653e2ac1a39f2fb1 SHA-256: f6f21f14163c1a5640d764d919a83c8dca9ebff78af659094d4ecce8424146ea
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains numerous links pointing to compromised WordPress sites and disposable hosting, suggesting a link farm or phishing lure. The presence of embedded URLs and the nature of the heuristics indicate an attempt to redirect users to malicious content, likely for credential harvesting or malware distribution.

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://infrive.ru/uplcv?utm_term=fallout+3+character+guide
    • https://www.golaw.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a1cb384457a---47577117031.pdf
    • http://kwong-cheong.com/userfiles/92513386165.pdf
    • https://vestol.bg/files/file/53789600851.pdf
    • http://benardoutlite.com/admin/fckeditor/fckdata/file/92182757589.pdf
    • https://grahampropertytax.com/wp-content/plugins/super-forms/uploads/php/files/3d39198e81c88fd2ea1e6c91f86b248d/zijaz.pdf
    • https://wholisticvibrations.com/wp-content/plugins/super-forms/uploads/php/files/72e69091f482a90594b6ecad2cbde0e3/domanubixibekozeru.pdf
    • http://iltorg.ru/upload/file/vojezakub.pdf
    • https://htfcompact.com/wp-content/plugins/super-forms/uploads/php/files/667065ffd28c8da430008df21f78ec43/22093849571.pdf
    • http://www.holzbau-hoelzl.at/wp-content/plugins/formcraft/file-upload/server/content/files/160a151e817767---didilaroxetolekufavizeke.pdf
    • https://hissekurban.com/resimler/files/79223866396.pdf
    • https://tucsonhomewindowtint.com/wp-content/plugins/super-forms/uploads/php/files/0a2573958400ba380984a7e994cba953/pumogivewususikuwoxerivu.pdf
    • http://dabaizhongxue.com/upload_fck/file/2021-5-15/20210515032850564242.pdf
    • https://robertmatzuzi-massagetherapist.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160bcd27784308---10997500784.pdf
    • https://takiminsahada.com/wp-content/plugins/super-forms/uploads/php/files/7euu1p3ea41u8ctes9e5i6mlnd/simozipuge.pdf
    • http://maxidmum.com/images/upload/fck/file/povodumujafi.pdf
    • https://www.generalutilities.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7cf98d9f01---51335166978.pdf
    • http://skuplaptop.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1608be2a5a0d52---56246590409.pdf
    • http://nyett.hk/uploads/news/files/sexorunitigegekikez.pdf
    • https://www.hagensmarketing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607870b3a3849---jedutakuxapitowidugosawob.pdf
    • http://sillajen.com/fckeditor/_upload/file/48517547178.pdf
    • http://escolacaritas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c3da8915661---lonemeluxadosijaxidozat.pdf
    • https://nacionalequipamentos.com/ckeditor/uploads/files/83439478515.pdf
    • http://xn--80akij1ajew.xn--p1ai/wp-content/plugins/formcraft/file-upload/server/content/files/160a0581369b76---degokinijib.pdf
    • https://gamletaarnhuset.no/wp-content/plugins/formcraft/file-upload/server/content/files/160743d6c156df---19480256343.pdf
    • 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_off0001085d.bin
d4a14ced6dae59994c0af7853f19c3bf6dad590d35733c76d77563f5c780e618
pdf-font-stream PDF embedded font (sfnt) at offset 0x1085D 10628 bytes
font_01_sfnt_off0001209c.bin
c9dd4ca97a22c3d9a847410b8d61fcb4a63b2c6f7cd1244b8ce68d586b44e93c
pdf-font-stream PDF embedded font (sfnt) at offset 0x1209C 17380 bytes
font_02_sfnt_off00014dc3.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x14DC3 16792 bytes