Malicious PDF — malware analysis report

Static analysis result for SHA-256 1afec34f7b3c6a6b…

MALICIOUS

PDF

71.2 KB Created: 2021-09-13 04:56:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: f28a314aece3d2fc15fce97e2ff5f6f3 SHA-1: 53e6cfd9287b5a0eb1bd678101541b503188ae1a SHA-256: 1afec34f7b3c6a6b5a564435a2c453c8214163283f18b8b36f86a6e9534e2a32
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate the document functions as a link farm, directing users to multiple external URLs, some hosted on compromised CMS uploads. The presence of numerous links, including one with a 'utm_term' parameter suggesting a tracking or lure mechanism, supports the attack pattern of directing users to potentially malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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 http://majstrissmt.eu/www-data/file/kizagenebitogi.pdf In PDF document text
    • http://viaterrestre.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613e31587708b---71499218451.pdfIn PDF document text
    • https://spandoekland.nl/userfiles/file/36914686332.pdfIn PDF document text
    • http://5percent-design-action.com/upload/users/files/46754231805.pdfIn PDF document text
    • https://astefin.ro/ckfinder/userfiles/files/32266902369.pdfIn PDF document text
    • https://eghamatyab.com/basefile/bainbookcom/files/topimilasa.pdfIn PDF document text
    • https://mai-avto.ru/upload_files/file/sadijikibupibifox.pdfIn PDF document text
    • http://impactpluslearning.com/ckfinder/userfiles/files/dibakagamodogipa.pdfIn PDF document text
    • http://deforma.it/userfiles/files/tajodujisudovifobi.pdfIn PDF document text
    • http://js-space.de/userfiles/file/ritaforolanases.pdfIn PDF document text
    • https://villamishkan.com/310renonew/front/images/files/4063275240.pdfIn PDF document text
    • https://adikkedua.com/contents/files/ganikikemebexexe.pdfIn PDF document text
    • http://www.hypnotiseur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613056b7048d2---sesuzojafenumofopedarole.pdfIn PDF document text
    • http://pileshoppen.dk/userfiles/file/koxetemuravewugipufa.pdfIn PDF document text
    • http://www.medical-psychology.gr/wp-content/plugins/formcraft/file-upload/server/content/files/161397ee2e5b96---fawodonapamid.pdfIn PDF document text
    • https://dotcomtravelegypt.com/userfiles/files/derarijopoxedevupuwovo.pdfIn PDF document text
    • https://magicdiscoradio.hu/userfiles/file/27146355791.pdfIn PDF document text
    • https://www.bouwenaaneensterkwerkgeversmerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613129385465f---rovemaluzamasamotovogaf.pdfIn PDF document text
    • https://christianbelieversmatrimony.com/web/christiansbelieversmatrimony/photos/ckeditor/files/42344994218.pdfIn PDF document text
    • https://gamletaarnhuset.no/wp-content/plugins/formcraft/file-upload/server/content/files/1613e7df9ac3a8---16077837220.pdfIn PDF document text
    • http://stellarp.com/userfiles/file/17335191578.pdfIn PDF document text
    • http://laros.cz/UserFiles/file/63361203977.pdfIn PDF document text
    • http://telesson.net/_UploadFile/Images/file/patusujam.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=instagram%2B%2B+view+private+account+downloadPDF 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_off0000b53e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB53E 15892 bytes
SHA-256: 0eba2158c8e6cb3886d62e33daf51b564e9d6cf10dba19452e0fb2d5bf6d4dc0
font_01_sfnt_off0000dd82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD82 11060 bytes
SHA-256: 31ed13a18af5f6c80f49de97a2bd803210867e8f9451df016f5a1aebc85c665b
font_02_sfnt_off0000f719.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF719 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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