Malicious PDF — malware analysis report

Static analysis result for SHA-256 01cfcaf40e48cb7b…

MALICIOUS

PDF

75.4 KB Created: 2021-06-13 16:43:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 312009d2582e62bff05a6cc90a55222b SHA-1: c4acaac48137c65c5484419da6e24a9a64b58939 SHA-256: 01cfcaf40e48cb7b464871b9f1dcadd1e8cd36d2db5227a5eb4dc44d1b93865f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains a link farm pointing to compromised WordPress sites, likely serving as a phishing lure. The presence of embedded URLs and the nature of the heuristics suggest the primary goal is to redirect users to malicious or phishing websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://pistant.ru/uplcv?utm_term=final+quiz+round+ideas PDF link annotation
    • https://gulertrafik.com/wp-content/plugins/super-forms/uploads/php/files/onuf4p54kheda6tdp8ie7gg9uk/sawasilijudupigusogu.pdfIn PDF document text
    • https://g-ortho.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607325a94e932---lixisif.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/a8kg81cniq7bso5a10kvrnpdv1/21663225969.pdfIn PDF document text
    • http://stopasbestos.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160b192d011a0c---36809836427.pdfIn PDF document text
    • https://mvpartners.be/images/uploadedimages/file/9783471486.pdfIn PDF document text
    • https://soechi.net/userfiles/file/4464163852.pdfIn PDF document text
    • http://permanentnimakeup-brno.cz/userfiles/files/fomebaruxe.pdfIn PDF document text
    • https://ladangmimpi.com/contents//files/23264718406.pdfIn PDF document text
    • http://erbilsunhotel.com/wp-content/plugins/super-forms/uploads/php/files/igqugh5r97bs1gb7991olijth2/99313050023.pdfIn PDF document text
    • http://vdgairconditioning.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609a10ba7074d---85299026383.pdfIn PDF document text
    • http://101-games.ru/images/uploads/files/dulejezekupajusizitup.pdfIn PDF document text
    • http://www.theagentpipeline.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073de284bc73---dazozadoravud.pdfIn PDF document text
    • https://hotelindigha.com/FCKeditor/file/mepinozisanifoluk.pdfIn PDF document text
    • https://earplighting.com/wp-content/plugins/super-forms/uploads/php/files/e3392890cec1e6255a2f6cabd3c4a71d/37141772809.pdfIn PDF document text
    • https://neoville.ru/wp-content/plugins/super-forms/uploads/php/files/ee252bc49805d9b671488227a0bf2719/10803783606.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e9c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9C8 4948 bytes
SHA-256: d13d4e22362707f95ae05e3382566230df7d8082105cfd78c3a6578a71a30718
font_01_sfnt_off0000fab1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAB1 11440 bytes
SHA-256: a21f3f2775e49fdef3b3820055c3fed283897bbdfc68e77ff7db7d33b53b1d79

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