Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b43768cd03a3084…

MALICIOUS

PDF

122.9 KB Created: 2021-06-28 18:22:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: 8e09b86379daf9f3d12c65096ad99713 SHA-1: 669d9f2188309453713c688a2f4e1ae005588354 SHA-256: 5b43768cd03a308426193ef024d36d59620d8ae32d53dd38fa3d69153b326f3a
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous URLs pointing to compromised WordPress sites, likely to host phishing pages or further malware. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggests this is a tactic to distribute malicious content through SEO manipulation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9936

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://philabc.ru/uplcv?utm_term=herblore+ironman+guide+osrs PDF link annotation
    • https://www.scilights.com/wp-content/plugins/super-forms/uploads/php/files/341a84d3c37fde715fff070d68236efa/kejekaxepemiwikotujejepi.pdfIn PDF document text
    • https://www.lang-mayer.de/wp-content/plugins/formcraft/file-upload/server/content/files/16083eb646dd67---62441188343.pdfIn PDF document text
    • http://www.inhd.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608331ebf2a1e---gesimimusenotoz.pdfIn PDF document text
    • http://crystalnymph.by/wp-content/plugins/super-forms/uploads/php/files/50b7b3a37fae28bfabfbc2995c67793d/pipugisarelibogure.pdfIn PDF document text
    • https://lakecountyoralsurgery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c8047d3996---52134306139.pdfIn PDF document text
    • https://iwistw.com/upload/files/gevadogabotawupuda.pdfIn PDF document text
    • https://cwlighting.com/wp-content/plugins/super-forms/uploads/php/files/412a2d640e029e086a602b74368d934b/8683470935.pdfIn PDF document text
    • https://www.idahomedia.com/wp-content/plugins/super-forms/uploads/php/files/6db6b81245896d92b78be7a057e244d0/17235552397.pdfIn PDF document text
    • https://cavalier-hundezucht.ch/userfiles/file/13913308762.pdfIn PDF document text
    • http://foire-fromages-et-vins.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072b04ced061---munomabunakuxoredakumaw.pdfIn PDF document text
    • https://www.areatransfers.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082045e7cd18---16347174390.pdfIn PDF document text
    • http://aliceinformaticasrl.com/user/pages/4444029658.pdfIn PDF document text
    • https://fermuar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160967be482a67---toxudededoxelapitanutuxu.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/67655516757.pdfIn PDF document text
    • https://kogan-photo.ru/wp-content/plugins/super-forms/uploads/php/files/18528042d381bc0963dec030edb6f9b0/9449335515.pdfIn PDF document text
    • http://www.training4thefuture.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607bf8dd6a02d---30041359292.pdfIn PDF document text
    • http://www.dj-csnl.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160aa8a0df005f---kagotiluviduxoguti.pdfIn PDF document text
    • http://lapawan15.com/shop/fck_file/file/19997743856.pdfIn PDF document text
    • https://zohopinler.com/calisma2/files/uploads/62008753109.pdfIn PDF document text
    • https://larioenergy.net/uploads/file/83842382980.pdfIn PDF document text
    • https://www.advids.co/wp-content/plugins/formcraft/file-upload/server/content/files/160c8f4dea990b---kegurozekejod.pdfIn PDF document text
    • https://dacinsara.ro/fckfiles/file/dologokol.pdfIn PDF document text
    • http://www.dean-cpa.com/files/adminpic/file/virabu.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_off000180db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x180DB 17340 bytes
SHA-256: 91686c2ddf244c0a62a4b78a96b9f719cd314a2c38336240d3cc621cd07187b8
font_01_sfnt_off0001ae47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1AE47 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001c65e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1C65E 10724 bytes
SHA-256: 119fd6ad16bd3b7b66e45911e6aaf74ce708fd0f263ac44fca26e70223323cb5

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