Malicious PDF — malware analysis report

Static analysis result for SHA-256 a3e8b476542eb5ba…

MALICIOUS

PDF

97.5 KB Created: 2021-08-02 21:13:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: ac85170d379cc5a23aa0b5ebc4d47aa0 SHA-1: 3082ad03dc85f1606aa1978821743f0a805dcf9c SHA-256: a3e8b476542eb5ba3c740e2590430c352ee44cdab472a56139d3b2ca9fa9db12
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the presence of multiple suspicious URLs points to a social engineering attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://vibrosystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160acab944afca---17326095451.pdf In PDF document text
    • https://www.olympusnorge.no/wp-content/plugins/super-forms/uploads/php/files/vgimusqn03e4trsc8s9uu6p8c3/marepot.pdfIn PDF document text
    • https://acronimocostanzo.com/userfiles/file/33813899098.pdfIn PDF document text
    • http://madinaboys.com/easydo%20v2.00/files/uploads/30255489518.pdfIn PDF document text
    • https://qamarapps.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf19fe778d3---guguni.pdfIn PDF document text
    • https://robertmatzuzi-massagetherapist.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160c060813d781---21935317078.pdfIn PDF document text
    • https://ddriu.hu/wp-content/plugins/super-forms/uploads/php/files/14eae718930aa0aea7bcc7dc3fe9c017/kuxanikukofedopoxokezofuw.pdfIn PDF document text
    • https://okazdedziecko.pl/_files/Media/file/peduwegefuxufisomuxewaxu.pdfIn PDF document text
    • http://ahsaipu.com/v15/Upload/file/2021561059388443.pdfIn PDF document text
    • http://tvcsoltau.de/userfiles/file/zujafinala.pdfIn PDF document text
    • http://run2endalz.org/clients/2/2b/2b4973775a35d8819257a28a16fdea67/File/86354050652.pdfIn PDF document text
    • http://kaitosushisb.com/uploads/files/lebeziwidiro.pdfIn PDF document text
    • https://chetanaus.org/bheru/uploadfiles/file/94082387725.pdfIn PDF document text
    • http://totaleclipsenv.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077883c5ab1b---29847678470.pdfIn PDF document text
    • http://tea-ra.com/user_data/upload/save_image/files/76043176174.pdfIn PDF document text
    • http://istvietnam.com/rich_editor/file/funivavamotukup.pdfIn PDF document text
    • https://smoothnomad.com/wp-content/plugins/super-forms/uploads/php/files/3lom7d04sv3jkmb9r1qdoeqvpc/tiviloboku.pdfIn PDF document text
    • https://enville.com/wp-content/plugins/formcraft/file-upload/server/content/files/160705bd9c1c8a---piwekemuwiwekemijapi.pdfIn PDF document text
    • http://thuexedanang247.com/uploads/image/files/65872604503.pdfIn PDF document text
    • https://www.ideaklinikkadikoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bceaf4a89c6---96435516508.pdfIn PDF document text
    • https://air-separation-supplier.com/d/files/52903027489.pdfIn PDF document text
    • https://www.mozartcantat.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160cbdad44826b---wasiwunufojimidamobov.pdfIn PDF document text
    • http://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/oeo242e6ii6k3qrmffsebht6dj/limijavalolosaxababevi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=asgardian+female+namesPDF 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f650.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF650 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010e67.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E67 10460 bytes
SHA-256: ae2245c23de8fae5284bfd12c9975df6283d2f4b622fa5503085170264b75bd9
font_02_sfnt_off000125d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125D8 17300 bytes
SHA-256: c55bf375448d5342e556bcd09b6b6479d56248f45e83abaeb20fe3cf6add34b2
font_03_sfnt_off00013ffb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13FFB 2060 bytes
SHA-256: cdd85f995bcbb8df48df6e829b640b4b7df49b400848d1a3fce3cd362009fa7d
font_04_sfnt_off00014953.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14953 17996 bytes
SHA-256: 6c32676c2e89667c5b9d845d16c5d69635d008f6022c950819cc6f9755c5102c

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