Malicious PDF — malware analysis report

Static analysis result for SHA-256 9edb786e78a575fc…

MALICIOUS

PDF

89.0 KB Created: 2021-09-08 08:26:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 718818e549877378b7169af967b532df SHA-1: c5e451745a328a7fc31bb5142fe850cc6791c23d SHA-256: 9edb786e78a575fc5f0bd6cbc2d1ea4ef0759a0bcb3237a59bf97dd7199aa969
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to compromised WordPress upload directories, suggesting a link farm designed to lure victims to malicious content. While no scripts were directly extracted, the nature of the embedded URLs and the detection signatures point towards a phishing or redirection attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://dmddsgn.com/wp-content/plugins/super-forms/uploads/php/files/8f400b369613844c4dad9ae09646a9d1/bimonopu.pdf In PDF document text
    • https://hr-serdahel.hu/images/file/fegekilirujujigodujefob.pdfIn PDF document text
    • http://cambridgekapurthala.com/damana/userfiles/file/wusupoz.pdfIn PDF document text
    • https://balbok.net/admin/ckfinder/userfiles/files/98114204628.pdfIn PDF document text
    • https://cosanuesa.com/componentes/editor/ckfinder/userfiles/files/zegoxexotinilixol.pdfIn PDF document text
    • http://nuestrasenoranm.org/clients/8/88/88a18899c67a61641ca1f7d027daa919/File/40736976864.pdfIn PDF document text
    • https://oncallanatomist.org/ckfinder/userfiles/files/tufasalavewekimexuti.pdfIn PDF document text
    • https://xn--64-mlcufjjaii0l.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/8fec9808c395ab40fcae722c37dfeaad/dupubasuwedawutede.pdfIn PDF document text
    • http://gongin.humenia.com/upload/userfiles/2021/08/files/210829220214.pdfIn PDF document text
    • http://ccsup.co.th/uploads/ckfinder/files/zojifevonuraxem.pdfIn PDF document text
    • http://soles2walk.cz/data/file/82193080943.pdfIn PDF document text
    • https://svetpoznaniyaonline.ru/wp-content/plugins/super-forms/uploads/php/files/dddbed604797fcfd6a355dcbe05d0a77/56957472653.pdfIn PDF document text
    • https://bf-pomosch.ru/wp-content/plugins/super-forms/uploads/php/files/tvhmnq4klrfc0ig57p0enjlsn7/divulajubiwidovogaxu.pdfIn PDF document text
    • http://2440027.ru/upload/file/ginikufoxoxitulokik.pdfIn PDF document text
    • https://nazrabilisim.com/calisma2/files/uploads/28210684378.pdfIn PDF document text
    • http://www.colegiometa.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/16073de7ca07f1---68617991045.pdfIn PDF document text
    • https://polymadeniyaglar.com/fckeditor/userfiles/file/wepuboj.pdfIn PDF document text
    • http://rld-carbon.ru/file/sojigesufobe.pdfIn PDF document text
    • http://computer-rudolstadt.de/upload/file/xinawonikepatexejimumusi.pdfIn PDF document text
    • https://www.geosuiteonline.de/wp-content/plugins/formcraft/file-upload/server/content/files/160885f2d6c032---jajiditarepobokiden.pdfIn PDF document text
    • http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/orj0fe0e256ohspitjglcuml25/17467864292.pdfIn PDF document text
    • https://avigailpekelman.com/sites/default/files/file/gufis.pdfIn PDF document text
    • https://eclipsetheaters.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a08e4855655---woxaguwuvokaxupere.pdfIn PDF document text
    • http://frederickfollows.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607e6d42419b4---65874776561.pdfIn PDF document text
    • https://bedandbreakfastholten.nl/userfiles/file/biwakiv.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=mapa+espa%C3%B1a+comunidades+autonomas+mudo+pdfPDF 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_off0000f1bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1BD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000109cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109CF 19348 bytes
SHA-256: 990f69cde2e0d4780d987aec3afd8b3702a8f65f489cd2b78288e0289d285e47
font_02_sfnt_off00013a90.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A90 10932 bytes
SHA-256: 351e6782bffcffddbbff8998a89424c95b394f220e2e4d29d10b467c9c186a1a