Malicious PDF — malware analysis report

Static analysis result for SHA-256 39d12fee6d764ed4…

MALICIOUS

PDF

81.7 KB Created: 2021-09-02 23:04:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 9f6584dcf5e489dde14b79d791754d0c SHA-1: ef42576eeb0d23c66c6fbe80af0a57f129bca373 SHA-256: 39d12fee6d764ed457ad048745fa354ac667dcdbd50e49b1a1de7894fd95e8dc
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous URLs pointing to compromised WordPress sites and other domains, likely serving as a distribution point for phishing or malware. The presence of multiple external URIs and the compromised CMS upload links strongly suggest an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://laborke.ru/uplcv?utm_term=compound+interest+chart+worksheet PDF link annotation
    • http://aberdeeneyes.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1606e0c36cd229---monujubilanuxagunimijub.pdfIn PDF document text
    • https://loctra.net/userfiles/file/juvupifekalajusuf.pdfIn PDF document text
    • https://teenvolunteerdallas.org/wp-content/plugins/super-forms/uploads/php/files/4ad4661b85a87dbf2291e13567c4d30b/96236582784.pdfIn PDF document text
    • http://www.ddd-iasi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160a1ed3f094cf---sisedivezubor.pdfIn PDF document text
    • https://najlepsze-w-polsce.pl/uploads/42169624173.pdfIn PDF document text
    • http://drstevealbrecht.com/wp-content/plugins/super-forms/uploads/php/files/0778d793640e278d3f39a303d11f74fe/nagurasesav.pdfIn PDF document text
    • http://www.skupp.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1607b927c4a028---88922154733.pdfIn PDF document text
    • https://choiceenergynetwork.com/wp-content/plugins/super-forms/uploads/php/files/d81d53cd409a2d4688c0aae1214d034d/paferevutozufez.pdfIn PDF document text
    • http://www.nisbd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab20c9ae84f---70889040712.pdfIn PDF document text
    • https://computerzone.pk/file/76906098115.pdfIn PDF document text
    • https://telewebmarketing.com/FCKeditor/file/pozerafo.pdfIn PDF document text
    • https://anukulagrotech.com/ci/userfiles/files/gutekigubitagemozapur.pdfIn PDF document text
    • http://energo-market.ru/sadm_files/26287481722.pdfIn PDF document text
    • http://rund-sro.cz/UserFiles/File/deduvisanoxerixubofanipuk.pdfIn PDF document text
    • http://ne-moloko.ee/wp-content/plugins/super-forms/uploads/php/files/4bed078a687e597d3d7089cbd0922a8e/45286265154.pdfIn PDF document text
    • http://icltindia.in/userfiles/file/52492436942.pdfIn PDF document text
    • http://skupka23.ru/upload/m/masigog.pdfIn PDF document text
    • http://silver1979.com/upload/file/16269534875.pdfIn PDF document text
    • https://congtydaihai.com/upload/files/tizegitod.pdfIn PDF document text
    • https://fmpride.com/wp-content/plugins/super-forms/uploads/php/files/009853ce01e62ec7c7678b97616a9591/xokasexitigakebibakop.pdfIn PDF document text
    • http://jaatkinson.com/userimages/pojode.pdfIn PDF document text
    • http://olimpic.hu/ckfinder/userfiles/files/87755642116.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_off0000dd72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD72 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f589.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF589 11040 bytes
SHA-256: 452e2aced4554b8632d9cc71952fbefe02632eb4a5b98d52b0b0a86bd48e012b
font_02_sfnt_off00010f1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F1E 16276 bytes
SHA-256: b039468bb5a13bbfe40f85f56693d11c837b5bdc42cad8c0ed19e9e5e67d45cc

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