Malicious PDF — malware analysis report

Static analysis result for SHA-256 13416a77f36ffc4a…

MALICIOUS

PDF

81.6 KB Created: 2021-09-19 10:19:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 9b1b6fb735ffebef532383119f7c3a74 SHA-1: cbf7f2d1ec3649558cf6ee2e80f40492a33940ce SHA-256: 13416a77f36ffc4a1a29cfe16dac90ce6499d8d1ac0a2cf23a08108b7aabc073
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, with specific heuristics indicating a payment redirection lure. The document contains numerous links to potentially compromised websites, suggesting an attempt to redirect users to malicious content or phishing pages. While no scripts were explicitly extracted, the presence of embedded URLs and the nature of the heuristics strongly suggest a phishing or scam attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Payment redirection / bank-detail change lure high SE_PAYMENT_REDIRECT_LURE
    Document describes new or changed bank, wire, ACH, IBAN, SWIFT, or routing instructions — a high-value business-email-compromise pattern
  • 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://arte-salon.ru/upload_picture/kofudunu.pdf In PDF document text
    • http://alvit-bk.ru/userfiles/file/22681849297.pdfIn PDF document text
    • http://vswet.ru/f/67330408463.pdfIn PDF document text
    • https://controlcert.se/wp-content/plugins/formcraft/file-upload/server/content/files/1613ba4e9e8bf7---24519251856.pdfIn PDF document text
    • https://sevenhillsgroup.net/ckfinder/userfiles/files/kiwosovedefavasolub.pdfIn PDF document text
    • http://anpharma.net/upload/files/202748264.pdfIn PDF document text
    • http://anoh.net/pds/userfiles/files/15471629580.pdfIn PDF document text
    • http://seasonmediagroup.com/pic/file/8580461195.pdfIn PDF document text
    • https://buonoantonio.it/userfiles/file/74856855535.pdfIn PDF document text
    • http://topnotchimports.com/ckfinder/userfiles/files/jonetogawuti.pdfIn PDF document text
    • https://heart-calligraphy.com/uploads/files/202109050127327500.pdfIn PDF document text
    • http://www.tempshift.com/app/webroot/files/uploadimagesfile/volokaf.pdfIn PDF document text
    • http://tt-ural.su/admin/ckfinder/userfiles/files/tedusutimivabememom.pdfIn PDF document text
    • http://toanthinh.vn/webroot/img/files/88419707734.pdfIn PDF document text
    • http://pegasomeeting.medcoast.net/ckfinder/userfiles/files/36080088491.pdfIn PDF document text
    • https://www.enviedecrire.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141ad61616d2---46155105624.pdfIn PDF document text
    • http://englandmatchshirts.com/assets/file/24704535667.pdfIn PDF document text
    • http://notar-frings.de/userfiles/file/webosowefek.pdfIn PDF document text
    • http://neuchina.org/userfiles/file/gewatifekireritinusojam.pdfIn PDF document text
    • http://emannsltd.com/userfiles/38870349842.pdfIn PDF document text
    • https://rubfila.in/files/file/zobodunadakuligosowifaker.pdfIn PDF document text
    • http://orderbestwings.com/uploads/files/lifolezilaxigovedod.pdfIn PDF document text
    • http://entone.es/wp-content/plugins/super-forms/uploads/php/files/b6b53f1abd01e3eec36ed8c7830dfdb1/nuxatuba.pdfIn PDF document text
    • http://magyaringatlanadatbazis.hu/dev/_user/file/woseterituwukiruxisi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=send+file+from+pc+to+mobile+via+wifiPDF 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_off0000d8be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8BE 10980 bytes
SHA-256: 1b41f35a5af0ed6bd20e117509a1d7f152e100f48ba862ca5e10d7cdda809d2b
font_01_sfnt_off0000f20f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF20F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010a21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A21 18108 bytes
SHA-256: a220936f52e1f59bd438c8d823952c8b33d4ea7c482c3316330883b0b70273ab

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