Malicious PDF — malware analysis report

Static analysis result for SHA-256 0a8aec5486a84ea0…

MALICIOUS

PDF

67.6 KB Created: 2021-10-05 09:04:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 001d50d014be47e402619d098cb02cc0 SHA-1: 3f3c9eadb636e9f283429d4f07ac354071475691 SHA-256: 0a8aec5486a84ea003bdda0a7db48d23f0915f6b6c5bd5bbb88f1b521bd9198b
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF is identified as a phishing lure due to its image-only nature and embedded clickable links. Multiple heuristics indicate it's a link farm hosted on potentially compromised or disposable domains, designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely leading to a phishing site or malware download.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 67 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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 http://motorlustor.net/userfiles/file/43680631956.pdf In PDF document text
    • http://studioguatta.it/userfiles/files/nomabitazujidijabirasapa.pdfIn PDF document text
    • https://www.shipgo17.com/plugin/ckeditor/ckfinder/userfiles/files/9452981089.pdfIn PDF document text
    • http://www.auditsi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1615960d0d419b---6360635552.pdfIn PDF document text
    • http://openendrep.com/userfiles/files/13982933163.pdfIn PDF document text
    • http://handbook.hu/upload/page/file/72158939271.pdfIn PDF document text
    • https://fengshan-zhennangong.org/upload/ckfinder/files/zoturenirupo.pdfIn PDF document text
    • http://pnc21.com/files/fckeditor/file/14748246986151c46cda207.pdfIn PDF document text
    • https://briljant-maleri.se/UserFiles/files/11716686950.pdfIn PDF document text
    • http://attlas.center/userfiles/file/61639125524.pdfIn PDF document text
    • http://jobcred.com/rk/jobcred/uploads/image/file/lesimalusapasoxad.pdfIn PDF document text
    • http://remontnoedelo.ru/wp-content/plugins/formcraft/file-upload/server/content/files/161452563ab071---tamofefika.pdfIn PDF document text
    • http://lifestyleufa.ru/wp-content/plugins/super-forms/uploads/php/files/1fc185d15ac40e1379731cbf6f7197a3/radibipexodipabak.pdfIn PDF document text
    • https://aadhaarretail.com/administrator/imagetemp/file/kizazaxexu.pdfIn PDF document text
    • http://bergepkolcsonzo.hu/userfiles/file/2152760671.pdfIn PDF document text
    • https://milsagliksen.org/upload/ckfinder/files/megotuda.pdfIn PDF document text
    • http://marketingnews.fr/images/file/firaluxumeruravifak.pdfIn PDF document text
    • http://nayyaralidada.com/alpha/ckfinder/userfiles/files/vazatesupijitapopi.pdfIn PDF document text
    • https://rabudiagnostic.com/userfiles/files/temujuxapunor.pdfIn PDF document text
    • https://petek.biz/resimler/files/timezonuperugejozoxoramuk.pdfIn PDF document text
    • http://asesoriagarpe.com/wp-content/plugins/formcraft/file-upload/server/content/files/16153d5e99d0fd---60893182421.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=theme+of+the+poem+snake+by+dh+lawrencePDF 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_off0000abfc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xABFC 14188 bytes
SHA-256: 664da2af0ea3ca6b666df7b59b952eced07cb11d35fac3e11b56048f46fadf89
font_01_sfnt_off0000cefb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCEFB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e712.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE712 11188 bytes
SHA-256: 8aa8b2b5f0b7ed0f0c2720424928f4ab85fc2430c3f210a1727d9b2f1268dcbd

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