Malicious PDF — malware analysis report

Static analysis result for SHA-256 d73ecb9313c57a07…

MALICIOUS

PDF

79.7 KB Created: 2021-09-08 05:11:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 5fe04fad6dd4096fe7f38a753e3ff516 SHA-1: eca2f4f75da9ea40d4d1ed7b1c7d734579c0dee7 SHA-256: d73ecb9313c57a07cd2ed0e05ec09b8139f7f2d27e589f026fa819e97bcaa5cb
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to compromised websites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The presence of multiple external URIs and link farms points towards an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

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://inwebjor.ru/uplcv?utm_term=waiting+on+the+world+to+change+chords+pdf PDF link annotation
    • http://brandnewgoods.net/userfiles/file/74860910593.pdfIn PDF document text
    • http://scea.edu.mn/ckfinder/userfiles/files/lenurusiruposoxidup.pdfIn PDF document text
    • http://kapsalonindex.nl/images/uploads/26462145896.pdfIn PDF document text
    • http://barrarioservicos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b15e2f40ae1---sewaladubagumafigumirim.pdfIn PDF document text
    • https://kindeeyudee.com/ck_files/files/tumul.pdfIn PDF document text
    • https://podimercrm.com/img/files/24261971820.pdfIn PDF document text
    • https://amalighting.com/wp-content/plugins/super-forms/uploads/php/files/7a36f6b51a8869381ce11d572d13c9e2/29934446430.pdfIn PDF document text
    • https://quickonboarding.com/wp-content/plugins/super-forms/uploads/php/files/95e19ca61a5a34de406ed10ac2db88e4/ponawixiwifegoninuv.pdfIn PDF document text
    • https://www.toptalentusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/161189fbaa778f---momoreten.pdfIn PDF document text
    • http://uniquecharacters.com/upload/files/73222065718.pdfIn PDF document text
    • https://classicandcamper.co.uk/wp-content/plugins/super-forms/uploads/php/files/vvb1ij25l0trlas12pevihprv2/sosivojamiwivadu.pdfIn PDF document text
    • https://nsck-cykelmotion.dk/userfiles/file/36993766874.pdfIn PDF document text
    • https://lcd96.ru/wp-content/plugins/super-forms/uploads/php/files/78285624f003d40f38b345eec48573c2/70216296982.pdfIn PDF document text
    • https://srp-galabau-rostock.de/wp-content/plugins/super-forms/uploads/php/files/tn11ukfhidhvemo6puorv5lhko/63428102425.pdfIn PDF document text
    • https://www.dolphinrfid.com/wp-content/plugins/formcraft/file-upload/server/content/files/160de14d1566fa---32188081558.pdfIn PDF document text
    • https://lllk.ru/wp-content/plugins/super-forms/uploads/php/files/1a088b0645f22164c8dd3be171d6e952/31864827233.pdfIn PDF document text
    • http://parkhighclassof60.com/clients/871169/File/4043697337.pdfIn PDF document text
    • http://galeriejacqueselbaz.com/userfiles/file/sibusulaso.pdfIn PDF document text
    • http://samtle.net/ckupload/files/70056688980.pdfIn PDF document text
    • http://dui-antidote.net/images/userfiles/file/genuwud.pdfIn PDF document text
    • https://www.ikedatosou.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c7ccd377f1---biluvalajejowusejidoli.pdfIn PDF document text
    • https://kermoulin.com/userfiles/file/82242455845.pdfIn PDF document text
    • https://autotrilogy.com/wp-content/plugins/super-forms/uploads/php/files/48826610a117f90e1035dccd5fc4f0b2/surovupilurefozixifojel.pdfIn PDF document text
    • https://limpjet.com.br/wp-content/plugins/super-forms/uploads/php/files/6e4106b2fbb8759b24e437c8a8445d6f/jutoletopisutibanasudijas.pdfIn PDF document text
    • https://www.cukoyem.com.tr/wp-content/plugins/super-forms/uploads/php/files/evtavc71icip1o1vq5i3fvgge1/lalepofotajalugoworomu.pdfIn PDF document text
    • http://doubletroubels.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cd9c6ccf23---xevegusade.pdfIn PDF document text
    • https://residenciasanamaro.es/userfiles/files/19030317560.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d363.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD363 17288 bytes
SHA-256: 3c833a1db7a4806b3963b75bc3d3d2c667232bcd90f7b3a4d776a597d3032a29
font_01_sfnt_off0000ffd5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFD5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000117ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117EC 10976 bytes
SHA-256: c2d5313e3dd3bdaf62d9137ae0d2397d4aa14c6797dfb9fa118d27caf796231a

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