Malicious PDF — malware analysis report

Static analysis result for SHA-256 2ca0f42723c5361a…

MALICIOUS

PDF

66.5 KB Created: 2021-09-30 11:56:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: b8006fe08370c57554133dfabbc7a9b2 SHA-1: 1d690e8fabf9f2308174e90cde6bd0659819a948 SHA-256: 2ca0f42723c5361ad35909b7644488f67acecf7a3941fc35c84e955976e43a2e
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF is identified as an image-only lure, typical for phishing attacks, containing numerous links to external sites. The presence of multiple links on disposable hosting and compromised CMS uploads suggests an attempt to obscure the final malicious destination. Although no scripts were explicitly extracted, the PDF structure and heuristic firings strongly indicate a malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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
  • 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 66 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 https://crysiq.ru/uplcv?utm_term=logo+logo+android PDF link annotation
    • https://namratalakhotia.com/userfiles/files/lizokozodowesalo.pdfIn PDF document text
    • http://nomorecpapmachine.com/userfiles/files/sisag.pdfIn PDF document text
    • http://areaengineeringsrl.eu/userfiles/files/58045200884.pdfIn PDF document text
    • http://www.ettermanenterprises.com/ckfinder/userfiles/files/lakupiwi.pdfIn PDF document text
    • http://dj-maily.com/uploads/pages/files/81589730755.pdfIn PDF document text
    • https://sharidendesignasphalt.com/wp-content/plugins/super-forms/uploads/php/files/bc8acda3fcaf1b784306b159a0e65aab/vovilu.pdfIn PDF document text
    • http://omeofest.eu/userfiles/files/ginivubukavoregifagobux.pdfIn PDF document text
    • http://sissonne.hu/editor_up/fexuwoterokop.pdfIn PDF document text
    • http://www.libroparlatolions.it/backoffice/ckfinder/userfiles/files/temilepezijovelod.pdfIn PDF document text
    • https://linhquan-group.com/upload/ck/files/94450007930.pdfIn PDF document text
    • https://kotata-zlin.cz/obr/clanky/file/kevapaluzadelodom.pdfIn PDF document text
    • http://kameleonhastanc.hu/files/file/kupimufofudixalatun.pdfIn PDF document text
    • http://cablexconsulting.com/Upload/file/54235509040.pdfIn PDF document text
    • https://comfort8889.com/upload/files/xubujonofurorikaf.pdfIn PDF document text
    • http://patanjali.zohukum.com/ckfinder/userfiles/files/pojixif.pdfIn PDF document text
    • https://marciasmithconsulting.com/wp-content/plugins/super-forms/uploads/php/files/0904957d93849559d27dcc1c3478b8c0/vividelalat.pdfIn PDF document text
    • http://xn--80affcyoc0ac1f6a.xn--p1ai/admin/modules/ckeditor/ckfinder/userfiles/files/fewoma.pdfIn PDF document text
    • https://jerseyshorepirates.com/userfiles/files/dazobikuso.pdfIn PDF document text
    • http://www.patricktennis.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16151ee503b346---28122189456.pdfIn PDF document text
    • https://www.quatainvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161405effeca58---lidumeloreranez.pdfIn PDF document text
    • http://ahdjcm.com/upload/files/9932579435.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_off0000ac51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAC51 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c467.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC467 9980 bytes
SHA-256: 6fc3e8805a1060a36f674d709dacc6eb0f377ef7bdea581cec221e4c32a7d5fb
font_02_sfnt_off0000da42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA42 14112 bytes
SHA-256: 2ecc3ddf91161b32a34df99cef5053f609573649b1256f298d6a07e035257ea4

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