Malicious PDF — malware analysis report

Static analysis result for SHA-256 947334d7bc0ec634…

MALICIOUS

PDF

87.8 KB Created: 2021-09-07 19:34:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 92e59933ec4105ab577f1ab8d8544db1 SHA-1: d83695f0e1decb78c8cfbe033ac735202b8c1b94 SHA-256: 947334d7bc0ec63491fb7fcde330989cbadd53b245fac66263a5d6c05e2d7322
156 Risk Score

Malware Insights

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

The PDF document contains a link farm directing users to multiple external URLs, some of which are hosted on compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The document body is heavily obfuscated and unreadable, providing no direct content-based clues.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://zigzagontwerp.nl/sites/default/files/file/84757099515.pdf In PDF document text
    • http://muaah.ca/userfiles/files/64086111511.pdfIn PDF document text
    • https://cbolean.com/wp-content/plugins/super-forms/uploads/php/files/4e8161c442b9208f1f523f30cabe5071/zukesosubulabixutovisis.pdfIn PDF document text
    • https://viecmarketing24.com/upload/files/38246295904.pdfIn PDF document text
    • https://westhigienia.hu/editor_up/41768563169.pdfIn PDF document text
    • https://ercrs.org/wp-content/plugins/super-forms/uploads/php/files/dfphj1lm1ab6hg8fur41hm5f9e/vosule.pdfIn PDF document text
    • https://howardsteeves.com/wp-content/plugins/super-forms/uploads/php/files/30257ba6f26b3f1d23884b2bad63aea4/80076009989.pdfIn PDF document text
    • https://truck-diagnostic.ru/wp-content/plugins/super-forms/uploads/php/files/d0764a2dc85ad92de0459d66b7cd3db6/2843122603.pdfIn PDF document text
    • http://ampletrekking.com/userfiles/file/xolinedidubokariwelel.pdfIn PDF document text
    • https://awlights.com/wp-content/plugins/super-forms/uploads/php/files/4add0701a6f691f574987921e25eb6d3/tiruwoxanezazabowunuz.pdfIn PDF document text
    • https://aspirans.com/files/file/66847459204.pdfIn PDF document text
    • http://nuyewpilot.academy/wp-content/plugins/super-forms/uploads/php/files/948803754e095511329111ec574d89a7/80009015532.pdfIn PDF document text
    • https://wacee.net/wp-content/plugins/formcraft/file-upload/server/content/files/1608f653c012c7---56237925006.pdfIn PDF document text
    • http://www.korayozelguvenlik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bdf1ba6fa49---37735097011.pdfIn PDF document text
    • https://sukienmiennam.com/userupload/files/49177912485.pdfIn PDF document text
    • http://yummyschool.com/_UploadFile/Images/file/dupira.pdfIn PDF document text
    • http://fw-simple.com/uploads/files/20758856069.pdfIn PDF document text
    • https://www.eziblank.com/wp-content/plugins/super-forms/uploads/php/files/ljg4tl9ro0bm3ml55bn0497695/jaduvevef.pdfIn PDF document text
    • https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dae9bf70981---bawujavavub.pdfIn PDF document text
    • https://masterpieces-mallorca.com/wp-content/plugins/super-forms/uploads/php/files/3a0d05997375098a21816d2d8c7047e4/gimibuzo.pdfIn PDF document text
    • https://jclifeschools.org/wp-content/plugins/super-forms/uploads/php/files/e93c8bc8a02bdac1b7cabc262ca2da3c/16269920561.pdfIn PDF document text
    • http://www.aportecnica.com/imagenes/editor/file/89904375913.pdfIn PDF document text
    • https://hmjrgoldhockey.org/wp-content/plugins/super-forms/uploads/php/files/5ee5324895da4fa1757aa75ddc211f3e/42444498642.pdfIn PDF document text
    • http://abapaposentados.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16074c2753676e---60162105364.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=fertility+definition+pdfPDF 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_off0000f39d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF39D 10252 bytes
SHA-256: 4512c9afd9b9bbfdfaf36c29deb74d0ffebd6c0aff059322acce41b82b09a642
font_01_sfnt_off00010ab4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AB4 18184 bytes
SHA-256: 4c58081df404a6c339750a53bd8c6f94c56f1602cd04eb76c66537b9bac66dd9
font_02_sfnt_off000139aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x139AA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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