Malicious PDF — malware analysis report

Static analysis result for SHA-256 a37f85e0c7f1a687…

MALICIOUS

PDF

111.7 KB Created: 2021-07-02 19:43:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 68fde8cd697c86e615e63a730b33a03d SHA-1: 062e4b6d13081e01e75244584305cb81ca0e9498 SHA-256: a37f85e0c7f1a6872b0d047542ee0efe0ee715ce6650e1ba6270f81cf827d4ad
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to compromised WordPress sites, suggesting a phishing or malware distribution campaign. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were explicitly extracted, the PDF structure and link farm behavior are indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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=crockpot+goulash+with+stew+meat PDF link annotation
    • https://securitydm.rs/slicice/file/guwidigefuloradetokexebu.pdfIn PDF document text
    • https://www.saenger-ohg.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608d3ed926af4---38691511194.pdfIn PDF document text
    • http://www.marcelasemper.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ffa0e0038d---xodezipusatetexapogamelo.pdfIn PDF document text
    • http://paillasse.hu/userfiles/file/94766375457.pdfIn PDF document text
    • http://xoblates.com/clients/e/e0/e08cfb93fb97b00c28394d0532709dc9/File/zadexarigugizitipiku.pdfIn PDF document text
    • https://www.audioclinica.pt/wp-content/plugins/super-forms/uploads/php/files/92dgi429gtsrbd7b46hhohrp03/9121310967.pdfIn PDF document text
    • http://esrafisek.com/images_upload/files/83260378967.pdfIn PDF document text
    • http://arcadia1973reunion.com/clients/3/33/33cb7023d77084166ed027ca16b579b7/File/77320422417.pdfIn PDF document text
    • http://chieusangducphat.com/uploads/userfiles/file/46786174495.pdfIn PDF document text
    • http://inlikeflintlogistics.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d193098415c---fujejoganotozo.pdfIn PDF document text
    • http://contelex.it/userfiles/files/gaxezanevejad.pdfIn PDF document text
    • https://betentour.com/sites/default/files/file/naporonabonitudebarizofi.pdfIn PDF document text
    • http://socialbomjesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606d0b0564e1b---madupofixavitagoj.pdfIn PDF document text
    • https://mattweidnerlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb4438987f2---jakojasemozolovenixik.pdfIn PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/7f72884b1d9f9736d1e3cb5753d9b6a5/niguvetufenewuxi.pdfIn PDF document text
    • https://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085bf716b13c---34368795413.pdfIn PDF document text
    • https://www.colegiodesafio.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/1607ad3ca6a8d0---sumegixabazefomipovijex.pdfIn PDF document text
    • http://anhbanglaw.com/userfiles/file/libax.pdfIn PDF document text
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/pmi41avesfcf287rh83568cnl2/40587968061.pdfIn PDF document text
    • https://pinotcar.com/wp-content/plugins/super-forms/uploads/php/files/1f18845682113f25e79c284f9dd4dd13/juboni.pdfIn PDF document text
    • https://www.oasipizza.it/wp-content/plugins/formcraft/file-upload/server/content/files/16089a67a16ba8---66587914229.pdfIn PDF document text
    • http://minhphucvietnam.com/uploads/userfiles/file/92477644558.pdfIn PDF document text
    • http://asbazainville.org/userfiles/file/nomedowusefikonikojifos.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_off00014e62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14E62 19548 bytes
SHA-256: 9def5577903e12f3c7517fbd88a0d35897de8fc97cfbda8809abe55d9aed3165
font_01_sfnt_off00017fb8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17FB8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000197cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x197CF 11024 bytes
SHA-256: 5d9a8ab307f6a0732fe052787f5f5d8611179089a11c299ce042c8316aec9e6e