Malicious PDF — malware analysis report

Static analysis result for SHA-256 cecfaa5fc41af799…

MALICIOUS

PDF

70.8 KB Created: 2021-09-09 12:38:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: bf6f92eae9d266ff39add76c8a0595a5 SHA-1: b95b4b65216485737f34aee26a71cef3e546ffae SHA-256: cecfaa5fc41af7996f8dd9428c3c6af1039b78b3d377a4d0bc853c900726d3c0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs, many of which point to compromised CMS upload directories or are part of a link farm hosted on disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious document delivery mechanisms.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://inwebjor.ru/uplcv?utm_term=game+download+mini+militia PDF link annotation
    • http://bagiez.de/userfiles/file/45048059882.pdfIn PDF document text
    • http://almawred-sy.com/files/adminfiles/files/jiwakotalibujupi.pdfIn PDF document text
    • http://www.hypnotiseur.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134d939c5788---vuwelude.pdfIn PDF document text
    • https://dmshospital.com/mm_engg/files/vibomunogokukitovarane.pdfIn PDF document text
    • https://profitaler.com/UserFiles/file/57184061252.pdfIn PDF document text
    • http://auburn-companies.com/userfiles/files/kusuwupevekamomukoteduta.pdfIn PDF document text
    • https://www.superioreagle.com/wp-content/plugins/formcraft/file-upload/server/content/files/161330e938a2e7---75365075846.pdfIn PDF document text
    • https://kiptep.ru/file/3378481542.pdfIn PDF document text
    • http://madinaboys.com/easydo%20v2.00/files/uploads/12935998711.pdfIn PDF document text
    • http://kowalstwwo.pl/public/cms/images/file/witavidixojo.pdfIn PDF document text
    • https://adasms.fr/userfiles/file/kepukanenadixekif.pdfIn PDF document text
    • https://korvioinfotech.com/ckfinder/userfiles/files/96795727647.pdfIn PDF document text
    • http://ersenergy.com/UserFiles/file/93593033921.pdfIn PDF document text
    • http://birizgardenhotel.com/userfiles/file/42692183350.pdfIn PDF document text
    • http://advocaatindex.nl/images/uploads/kumabewanusagisobipino.pdfIn PDF document text
    • https://www.potravinyav21.cz/ckfinder/userfiles/files/10564053386.pdfIn PDF document text
    • http://hometextiles-consultant.com/ckfinder/userfiles/files/bavokaxokavizomesirup.pdfIn PDF document text
    • http://zpkprzemysl.pl/ckfinder/userfiles/files/79271961857.pdfIn PDF document text
    • http://4998horo.gmmwireless.com/contents/files/kiralirunexopaferav.pdfIn PDF document text
    • http://stjconsulting.it/userfiles/files/mebolukap.pdfIn PDF document text
    • https://sdyh.gr/wp-content/plugins/super-forms/uploads/php/files/57hoi6kbf78fbfs1pvu74flvm7/1094171003.pdfIn PDF document text
    • http://qiangka.com/ckfinder/userfiles/files/soketejamorod.pdfIn PDF document text
    • http://aardbeienfeesten.nl/uploadimages/files/32390123256.pdfIn PDF document text
    • https://b2b-intelligence.it/uploads/file/88415157296.pdfIn PDF document text
    • http://skiflogistics.ru/userfiles/file/15068645148.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_off0000b865.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB865 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d07c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD07C 10264 bytes
SHA-256: da1b0f34c7b1e0e96a70b0813c30d11f285e91b9fe52d7bff896ec8520047d6d
font_02_sfnt_off0000e78d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE78D 14976 bytes
SHA-256: fb8b8db393a5167de08fe34d2da6fdd8b5210e6f9a31242607af589ca7c9dc7a

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