Malicious PDF — malware analysis report

Static analysis result for SHA-256 ab9619e83a7646d4…

MALICIOUS

PDF

82.2 KB Created: 2021-09-06 20:43:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: a612ef96a7885077e46f04844c1918ad SHA-1: 94783097a83229fa5855d11c4d46c96156f3ac35 SHA-256: ab9619e83a7646d4be04e779d4ca682dda12b554a4599de7907cb815153340cf
156 Risk Score

Malware Insights

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

The PDF contains a large number of links, many pointing to compromised WordPress sites and disposable hosting, suggesting a link farm or SEO poisoning tactic. ClamAV detection and ML classification strongly indicate malicious intent, likely to redirect users to phishing or malware distribution sites. No scripts were extracted, and the document body was unreadable, limiting further analysis of specific payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://shellserva.nl/docs/Image/file/80534076458.pdf In PDF document text
    • https://www.lavishlook.se/wp-content/plugins/super-forms/uploads/php/files/dde0cc0b7df8d89fb49ee6dc82758bc9/konigukuxijew.pdfIn PDF document text
    • http://hattrick-sports.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c627c8e6ae1---45394119173.pdfIn PDF document text
    • https://hydratrend.com/application/third_party/ckfinder/userfiles/files/20461141033.pdfIn PDF document text
    • https://www.histoiresdegroupes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607592c1d3fe2---fomunikomelutab.pdfIn PDF document text
    • https://die-elke.de/cms/elke_page_files/file/pekap.pdfIn PDF document text
    • https://europacreativaeuskadi.eu/files/galeria/files/50919327074.pdfIn PDF document text
    • https://inclinedigital.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d2a744a0eae---xanogebelugutojobawinus.pdfIn PDF document text
    • http://collegium-connect.nl/ckupload/files/nigigagipe.pdfIn PDF document text
    • http://skkouty.cz/ckfinder/userfiles/files/95102515926.pdfIn PDF document text
    • http://bridgesonthepark.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099333a357f7---bukizugufokiropobapof.pdfIn PDF document text
    • http://dentalclinicbangalore.com/uploads/vizegedirajopekesimivur.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/f930fd2162d9e09431cefac8d61bf73d/61593085458.pdfIn PDF document text
    • https://www.infrascale.com/wp-content/plugins/super-forms/uploads/php/files/c65e046da6e374cd3d0c005b53a13221/wejozerujipe.pdfIn PDF document text
    • http://kutyasturak.hu/images/files/rexetotukizexi.pdfIn PDF document text
    • http://trackeg.com/en/wp-content/plugins/formcraft/file-upload/server/content/files/1607717a1c2b25---xapemivep.pdfIn PDF document text
    • http://www.trimbleexpress.sk/wp-content/plugins/formcraft/file-upload/server/content/files/16104043415883---1076448744.pdfIn PDF document text
    • http://computer-rudolstadt.de/upload/file/6555645697.pdfIn PDF document text
    • http://henri-ruch.ch/doc_pub/file/jelezipesanufidekezosi.pdfIn PDF document text
    • http://cloverpark1959.com/clients/51168/File/botosugaxemobabevowofuwo.pdfIn PDF document text
    • https://www.helpagesl.org/wp-content/plugins/formcraft/file-upload/server/content/files/1612cd689176e1---14794643273.pdfIn PDF document text
    • https://www.acptechnologies.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bae17dbce74---xarufitazome.pdfIn PDF document text
    • http://mgmkt.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160df97cfdd8eb---50034019556.pdfIn PDF document text
    • http://garmagostaran.com/Upload/file/kikakokutuwom.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=ryobi+pinless+moisture+meter+manualPDF 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_off0000dc3a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC3A 17716 bytes
SHA-256: 3af69ef2bc16655ca6aed3e6872ed9fb4cc61fc99ba39a284c8e8b8084b5ea5c
font_01_sfnt_off00010a0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A0E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012225.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12225 10812 bytes
SHA-256: 3c26aa3be0bb3b982a9e20d9f4c8624591fbec852c12b5ba7352eef36899359d

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