Malicious PDF — malware analysis report

Static analysis result for SHA-256 d40dc7f26df99517…

MALICIOUS

PDF

87.8 KB Created: 2021-09-09 14:54:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 1e963a4e8e1c78f3f348ba227d9ebdf5 SHA-1: 5f74c899c91d367963f3ae1769e8ab48caabfbc2 SHA-256: d40dc7f26df9951708e3c54ba8f676ff5bbb4781440d84ab0437c5333f34cf4d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised CMS upload storage and disposable hosting, indicative of a link farm designed to obscure the final destination. ClamAV and ML classifiers strongly flagged this PDF as malicious, specifically as a phishing trojan. While no scripts were directly extracted, the heuristic firings suggest the PDF's primary function is to redirect users through a series of links, likely to a phishing page or a malware download.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://www.moteco.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16134721fcdc55---balefoxipetir.pdf In PDF document text
    • http://gruppocinofilomarsalese.com/userfiles/files/tivajoxogifaj.pdfIn PDF document text
    • http://ghettaetamionarchitetti.it/userfiles/files/rekipaxidonase.pdfIn PDF document text
    • https://listapp.in/ci/userfiles/files/15268750235.pdfIn PDF document text
    • https://study-abroad-travel.com/ckfinder/userfiles/file/sabur.pdfIn PDF document text
    • https://xn--23-6kci4asohe8k.xn--p1ai/userfiles/file/sazojemuromode.pdfIn PDF document text
    • https://malinaionescu.ro/userfiles/file/kosuratubepif.pdfIn PDF document text
    • http://marienoellebermond.com/img/uploaded/file/12968814425.pdfIn PDF document text
    • http://litho-and-co.fr/ckeditor/upload/files/70815060924.pdfIn PDF document text
    • http://www.marsagri.com/wp-content/plugins/formcraft/file-upload/server/content/files/161337d82c8905---pefapo.pdfIn PDF document text
    • https://eguiders.com/uploads/85156997199.pdfIn PDF document text
    • http://hqshop24.com/userfiles/file/sekurivozagama.pdfIn PDF document text
    • http://cualuoiskydoor.com/webroot/img/files/28514863403.pdfIn PDF document text
    • https://www.andimoda.com/wp-content/plugins/super-forms/uploads/php/files/be9492ade797bb6381cff1bb29f9b726/77614102714.pdfIn PDF document text
    • http://hattrick-sports.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613902a09bc28---sajuzajelilemozoboz.pdfIn PDF document text
    • https://www.certificagreen.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613327cd31821---nevefo.pdfIn PDF document text
    • http://zatexpress.com/upload/userfiles/files/25636414502.pdfIn PDF document text
    • http://rutka.pl/media/upload/files/579fa7018ecb18f0829755ae5386af3f.pdfIn PDF document text
    • http://basketaci.cz/UserFiles/File/56128592438.pdfIn PDF document text
    • http://nt-module.ru/ckfinder/userfiles/files/wokelimevoxiwumak.pdfIn PDF document text
    • https://dallaslandscapedesign.com/media/files/35043151153.pdfIn PDF document text
    • http://www.nationaalgolfcongres.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16139467c9ddac---vawemikalabav.pdfIn PDF document text
    • http://churchtextile.com/userfiles/file/11847888854.pdfIn PDF document text
    • http://doradcyprawni.com/images/pliki/57781216729.pdfIn PDF document text
    • https://frasertechno.com/wp-content/plugins/formcraft/file-upload/server/content/files/161367b81c3520---logagividexezavafabosoj.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=best+escape+games+for+android+freePDF 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_off0000f312.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF312 10968 bytes
SHA-256: 1999a934bab8a6c719d4b5e8550b035e02bf369c3ea3b2368a1a76cf6d686743
font_01_sfnt_off00010c5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C5E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012470.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12470 17500 bytes
SHA-256: 4dc5a1a648efb4c3b0946f10a5efc1db3b453072b001ff100c5e04ba3578a90a

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