Malicious PDF — malware analysis report

Static analysis result for SHA-256 86d90ce579b1ceb9…

MALICIOUS

PDF

102.9 KB Created: 2021-06-29 16:02:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 5f46e9c2a89de3187f381f69d28e3fe3 SHA-1: 1e3c142b2a5251be5accf3b9b9f88772833b5f84 SHA-256: 86d90ce579b1ceb9d723540b0231409b34872b8759b23fcbf417d71bd08258b6
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous embedded links, many pointing to compromised WordPress uploads and disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The presence of these links indicates an attempt to facilitate phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9790

Heuristics 7

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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=what+two+products+of+the+light+dependent+reactions+are+used+up+in+the+light+independent+reactions
    • http://brilsports.ro/userfiles/file///masine.pdf
    • https://www.pharmaright.ca/wp-content/plugins/super-forms/uploads/php/files/0dngu1nbt2lmutio9lgm74g01q/90433553490.pdf
    • https://www.areatransfers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f1ee686cd2---66065586399.pdf
    • http://serendipityorlando.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607665df90d43---85265689597.pdf
    • https://web-sila.ru/wp-content/plugins/super-forms/uploads/php/files/77d512e03be9b088206e83f8a8b41e23/titos.pdf
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/d0e625to8248f0eheknmqi5ta3/15324627797.pdf
    • http://mas.vacations/wp-content/plugins/formcraft/file-upload/server/content/files/160afb3e0a05f5---2163397384.pdf
    • http://acecaalcoy.com/userfiles/file/88746502728.pdf
    • https://petroblend.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090b939751be---47316570735.pdf
    • https://plumcourse.com/wp-content/plugins/super-forms/uploads/php/files/3a4dae81f01cab7465520748bb733015/bufobiwijudan.pdf
    • https://mosallaesf.ir/uploads/ck/files/28589118411.pdf
    • https://emergent-partners.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aea774db72e---26502496442.pdf
    • https://humicdp.com/uploads/2021-06-12/images/files/38608277298.pdf
    • http://anhuifan.com/upload_fck/file/2021-5-26/20210526145932102796.pdf
    • https://travelselection.us/wp-content/plugins/formcraft/file-upload/server/content/files/160c0d1d01740f---vuribodipebawolififigak.pdf
    • http://gyobel.it/public/file/58657435110.pdf
    • https://tavio.ru/files/file/82347849094.pdf
    • https://www.sadcmedia.com/wp-content/plugins/super-forms/uploads/php/files/3fl2l8eti8pcmirsnc0bat059g/javaririzikom.pdf
    • http://bigpictureresources.com/userfilesbigpicture/file/nunubuxe.pdf
    • http://blpest.com/UserFiles/file/65803614495.pdf
    • http://forglass.sk/userfiles/file/temub.pdf
    • https://bursaceviritercume.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab8ff9818da---nexaputikipasixu.pdf
    • https://humanistbeauty.com/wp-content/plugins/super-forms/uploads/php/files/6fnmun7ksdqkiq19dmhqvp2p5u/mopixotazesokoxitazefoja.pdf
    • http://hani-bee.com/userfiles/files/47805542406.pdf
    • http://kazenergy.kz/wp-content/plugins/formcraft/file-upload/server/content/files/160c87c80a80b4---73224698135.pdf
    • https://tocgia247.com/wp-content/plugins/super-forms/uploads/php/files/kb8co40ada9a0fmbmcv0up6754/tulumuvuxajerixu.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00012b8c.bin
ab310f1db4cd7a337287a8b5ab929ec57bba97cdbea270000fda700f76104d67
pdf-font-stream PDF embedded font (sfnt) at offset 0x12B8C 11080 bytes
font_01_sfnt_off00014526.bin
06fd3b04336a14a1590f253c2cd95d81c80aa156c59dc25dcaaff3e491571d01
pdf-font-stream PDF embedded font (sfnt) at offset 0x14526 17276 bytes
font_02_sfnt_off00017286.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x17286 16792 bytes