Malicious PDF — malware analysis report

Static analysis result for SHA-256 ff1af96abb998b08…

MALICIOUS

PDF

100.5 KB Created: 2021-06-29 17:00:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 7c1e216da1c089224df7bdcd0f8c4621 SHA-1: 459e5780b83a5b47895706118cdd44d7898c8880 SHA-256: ff1af96abb998b08c6f20e10daf46f82c10f86ff9a5105367af090047ffd0245
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious. It functions as a link farm, containing numerous external URIs pointing to various websites, many of which appear to be compromised or disposable hosting. The primary purpose seems to be directing users to potentially malicious content or phishing sites, aligning with the 'Spearphishing Attachment' technique.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9757

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://pistant.ru/uplcv?utm_term=meaning+of+exile+in+telugu PDF link annotation
    • http://uekekb.ru/!upload/files/5681543785.pdfIn PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/d79eef5bb7188d531748e3906e0934b0/senigukofesajivadib.pdfIn PDF document text
    • https://dungcuruamui.com/wp-content/plugins/super-forms/uploads/php/files/bu1lv1c5uvth88ndo47miubmob/70347989503.pdfIn PDF document text
    • http://bawaconstructions.com/editorData/file/94498825675.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077f38422413---getozojuxorevuzumiweseji.pdfIn PDF document text
    • https://www.bluegreenshouseboats.in/wp-content/plugins/formcraft/file-upload/server/content/files/1609bda6bb2b00---bonivegiguxuwozat.pdfIn PDF document text
    • https://zionapostolicministries.org/uploads/file/tezesupupisodukewanuxil.pdfIn PDF document text
    • http://araonline.hu/uploads/file/sapugedusun.pdfIn PDF document text
    • http://www.tobywells.org/media/fckdir/file/wafifejasifiwivuziwut.pdfIn PDF document text
    • http://jtour.vn/userfiles/file/77432072319.pdfIn PDF document text
    • https://www.bouwenaaneensterkwerkgeversmerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608081e7e54b3---togata.pdfIn PDF document text
    • http://www.yourhealthyourchoice.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608c62b184fa3---walexokomoso.pdfIn PDF document text
    • http://kazenergy.kz/wp-content/plugins/formcraft/file-upload/server/content/files/160b5ca90ce70e---42620380600.pdfIn PDF document text
    • https://baxsporthorses.com/userfiles/file/40738774858.pdfIn PDF document text
    • http://www.truca-taoules.com//ckfinder/userfiles/files/13033480992.pdfIn PDF document text
    • https://securitydm.com/slicice/file/33122394221.pdfIn PDF document text
    • https://olgapopovaphoto.com/wp-content/plugins/super-forms/uploads/php/files/5935d64f83603dda8fd602cb443c262e/68440414432.pdfIn PDF document text
    • https://lienlacanien.com/img_pages/file/62825388747.pdfIn PDF document text
    • http://tuzvedo.hu/elemek/file/98185387174.pdfIn PDF document text
    • https://floraplant.gr/FCKeditor/userimages/file/80629829951.pdfIn PDF document text
    • http://www.mkkdigital.pt/wp-content/plugins/formcraft/file-upload/server/content/files/16080db64b232b---56348630096.pdfIn PDF document text
    • https://goldenparadisestsimons.com/wp-content/plugins/super-forms/uploads/php/files/e68a7e8a219fc5246e543b33d3f3d51a/33061570956.pdfIn PDF document text
    • http://assistance.uz/images/shared/file/sesog.pdfIn PDF document text
    • 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off0000f897.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0xF897 19832 bytes
SHA-256: 34792761944a0a20935ac02d2155838375485e19cc38ac1906b584e13760262a
font_00_sfnt_off0000e134.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE134 10316 bytes
SHA-256: 072fb0443be57a5fcf4cb996ae850326968e91a1e5c1b4060dbdebddb1e7bd9c
font_02_sfnt_off0001199d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1199D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off000131af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x131AF 27996 bytes
SHA-256: c5c6b3c2d1f478f83f863bc27f0f40fa2c6c6db9a4f092c4222fde4b549e8f1d
font_04_sfnt_off00017372.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17372 4352 bytes
SHA-256: 14f0de74b4fd2e4b078ad08f2c5cd88700341f86252b3327bec0d7c58382e63b

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