Malicious PDF — malware analysis report

Static analysis result for SHA-256 86b89bde232faea9…

MALICIOUS

PDF

94.0 KB Created: 2021-07-01 23:05:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 63686c3a2252ae73668438ac28ed5f8e SHA-1: 623e1585e5c27366fef27d5fc1c9c8c355d7dc78 SHA-256: 86b89bde232faea9616a23ec0e1651cfce9dcedcfb4e8e6d408b1c8f929bc296
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains numerous embedded URLs, many pointing to compromised CMS upload storage or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The presence of these URLs and the overall detection pattern indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://garglob.ru/uplcv?utm_term=qualities+of+a+good+girl PDF link annotation
    • https://bouwservicewinthagen.nl/userfiles/image/file/27946322179.pdfIn PDF document text
    • http://cameronhaddock.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ae3d873a32---jejixutoxasulamumujezoras.pdfIn PDF document text
    • http://biosite.ru/images/news/file/tokeremil.pdfIn PDF document text
    • http://nw-line.ru/generic/uploaded/71727823371.pdfIn PDF document text
    • http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/n3b4ltd5eo7gj2bihbsfofcrh1/75066202205.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/dovuzosixobilaw.pdfIn PDF document text
    • https://iamluno.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c4e72d54d1a---tofugiruvakafakex.pdfIn PDF document text
    • http://www.expertnutritionadvisor.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b776d6d695---66513315352.pdfIn PDF document text
    • http://www.gametimecatering.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091767156a78---67444996123.pdfIn PDF document text
    • https://www.hintonassociates.com/wp-content/plugins/super-forms/uploads/php/files/3573591f3a253867c522d90a3839799d/82712876325.pdfIn PDF document text
    • https://kachhiproperties.com/wp-content/plugins/super-forms/uploads/php/files/8q4k8neq5srtuc8ktl1h9ng8j6/vikevefeperefodukig.pdfIn PDF document text
    • http://s2ipower.com/survey/userfiles/files/74753580048.pdfIn PDF document text
    • https://e-lightingcontrols.com/wp-content/plugins/super-forms/uploads/php/files/f231655c1d8e30c658bc4320805685b7/wuxaredotalobilupaw.pdfIn PDF document text
    • http://aurora-c.jp/files/files/jukogiwugut.pdfIn PDF document text
    • https://whitelightdesign.com/wp-content/plugins/super-forms/uploads/php/files/5f5907766da0c7826657d0dd2e5fd8db/37938121647.pdfIn PDF document text
    • http://theemasternetworker.com/ckfinder/userfiles/files/sanudo.pdfIn PDF document text
    • https://www.electriclighting.com/wp-content/plugins/super-forms/uploads/php/files/34c53f523f468d6a3a8df921346440cf/vekorotebaliv.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/f575d9986b191998bbf32920f9e70a69/72631493827.pdfIn PDF document text
    • http://writtenmail.com/upload_images/file/sopikidelap.pdfIn PDF document text
    • http://ciskmv.com/css/file/zaxokulosujesafixolisawup.pdfIn PDF document text
    • https://maximatrimony.com/ckfinder/userfiles/files/gasokuraxonogenazibibir.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160845395e9c6b---vuvazop.pdfIn PDF document text
    • https://feriaesotericadeatocha.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c0e98afd99---tevomovameveje.pdfIn PDF document text
    • http://www.thelawchamber.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085a77be2924---xijakejufaduwarurekipidef.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_off00010a57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A57 17996 bytes
SHA-256: 79775c235f5177e39c7df02be37a9649460a71d8c9b575d88c3fc311a067e9f6
font_01_sfnt_off00013902.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13902 10584 bytes
SHA-256: 2d90ffa205092f2bdba5bd12182bb1b1b1c066b6ada284212a634c3cbd198c14
font_02_sfnt_off00015136.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15136 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1