Malicious PDF — malware analysis report

Static analysis result for SHA-256 8143d936b4883b63…

MALICIOUS

PDF

87.2 KB Created: 2021-09-21 05:24:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 0623a2c250303d0f0392f7da3a9a1ce8 SHA-1: fa1d4fa0e6cd918641e255e820607d0b2226afdf SHA-256: 8143d936b4883b6322b3894f1b20c9976d1cafc949f0edb17320f38a01c4d3fc
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ML classifiers and ClamAV, with multiple heuristics indicating it's a link farm pointing to compromised websites. The document body is heavily obfuscated, but the presence of embedded URLs and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic suggest the primary purpose is to redirect users to malicious sites. No scripts were extracted, but the PDF structure itself likely contains JavaScript to facilitate these redirects.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 7

  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://shevian.com/images/file/zalezajolidif.pdf In PDF document text
    • http://everest-c.ru/ckfinder/userfiles/files/zuziguwin.pdfIn PDF document text
    • http://myhomeinparis.com/userfiles/files/98007551088.pdfIn PDF document text
    • https://camgloberealtor.com/userfiles/file/sagesexodegilop.pdfIn PDF document text
    • https://cakkue.com/contents/files/41712405232.pdfIn PDF document text
    • http://ldksolar-officialliquidation.com/userfiles/files/luxolunu.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131705108bc3---12912800869.pdfIn PDF document text
    • http://tutek.eu/userfiles/file/4162041320.pdfIn PDF document text
    • http://keitbg.com/images/files/titumuwifajesudeji.pdfIn PDF document text
    • http://asesoriagarpe.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140e5246182a---42499272526.pdfIn PDF document text
    • http://geometracosentino.com/userfiles/files/zuzaliradupa.pdfIn PDF document text
    • http://fuhua.tumujike.com/assets/upload/files/202109121013548170.pdfIn PDF document text
    • http://ailizia.com/userfiles/17003316217.pdfIn PDF document text
    • https://inchiriereelicopterromania.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613f34fbcbe43---23914705396.pdfIn PDF document text
    • http://umffz21.ru/admin/ckfinder/userfiles/files/dosafejunaxejiw.pdfIn PDF document text
    • https://thomsonindia.com/userfiles/files/80937808578.pdfIn PDF document text
    • http://lineshare.net/upload/files/20210906155150.pdfIn PDF document text
    • https://galerieportelouise.be/userfiles/files/napufewapijegulig.pdfIn PDF document text
    • https://www.sussexweddingservices.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16131b7da6ca89---bufejiwazinapozij.pdfIn PDF document text
    • http://haiqi-machine.com/d/files/99330950393.pdfIn PDF document text
    • http://haiqi-machine.com/d/files/91101126485.pdfIn PDF document text
    • http://bumsnab.ru/uploads/files/bowifabebusesozelob.pdfIn PDF document text
    • http://offerseir.com/basefile/offerseircom/files/bevorum.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=file+transfer+android+to+pc+wirelessPDF 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_off0000f1a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1A8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000109ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109BA 17152 bytes
SHA-256: 91cad6c825247ee11fe6a92cf4496da40005da5334b5b75559a9c4809ee042d7
font_02_sfnt_off00013648.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13648 10676 bytes
SHA-256: 83e91714dcb583a75580dfad7c2ede0c22eb17be7caed0d9322aafa9379419e7

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