Malicious PDF — malware analysis report

Static analysis result for SHA-256 7d1679b6eade05b8…

MALICIOUS

PDF

79.4 KB Created: 2021-08-02 10:52:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 31a37c60197e2037cb137501376623d3 SHA-1: 8c8fd7599d6ec5de1e7b979cb5c590e3a88acec8 SHA-256: 7d1679b6eade05b8ed2f10a13af4fefc678562d4bbc4deb5440bc9ce72ad28e0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to disposable hosting or compromised CMS uploads, indicative of a link farm. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware delivery. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

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://reutlinger.pl/userfiles/file/koratoxoviroxunu.pdf In PDF document text
    • http://anpo.vn/upload/files/nemanumelezoreguxegij.pdfIn PDF document text
    • http://bigband-ulm.de/userfiles/files/6248324121.pdfIn PDF document text
    • https://mission4recruitment.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093a82ae7a7a---80836469318.pdfIn PDF document text
    • http://tincorner.vn/uploads/files/wodapimejopa.pdfIn PDF document text
    • http://parkwaywest1974.com/clients/861606/File/41408881698.pdfIn PDF document text
    • https://dietacud.eu/upload/file/19719325859.pdfIn PDF document text
    • https://pacantioquia.org/aym_image/files/15261497407.pdfIn PDF document text
    • http://ne-moloko.ee/wp-content/plugins/super-forms/uploads/php/files/c357d3668f47220d0f0e4d102a9b0800/47311340182.pdfIn PDF document text
    • https://alkhairi.co.uk/wp-content/plugins/super-forms/uploads/php/files/4337c42d7a5c19caa78a965a4a3afb99/bedidifufavujexabeno.pdfIn PDF document text
    • http://kirakuramenandsushi.com/uploads/files/96053234860.pdfIn PDF document text
    • https://amirep.com/wp-content/plugins/super-forms/uploads/php/files/446c60860a97f91945aabeb88571a114/57570774544.pdfIn PDF document text
    • http://belgium-ex.com/images/blog//file/51268054875.pdfIn PDF document text
    • http://www.look4job.gr/images/_user_na/file/jajajigifatufije.pdfIn PDF document text
    • https://aquariumfargo.com/wp-content/plugins/super-forms/uploads/php/files/268cc5d77e096d6cf3180e40c5b75581/51702338694.pdfIn PDF document text
    • https://auf.vn/wp-content/plugins/super-forms/uploads/php/files/8oudfk2oarpqq5lno8gebfd5b7/gumosikumezizad.pdfIn PDF document text
    • http://ecohort.com/userfiles/files/nuxuvetironetapom.pdfIn PDF document text
    • https://hoya.hr/UserFiles/file/fogakebujal.pdfIn PDF document text
    • https://grahampropertytax.com/wp-content/plugins/super-forms/uploads/php/files/177e7c8fc5f85861c50acef67f705b65/potujarijevupewubokuzami.pdfIn PDF document text
    • https://agrachoff.ru/wp-content/plugins/super-forms/uploads/php/files/8f05002086a3fabc3703914c3fd5e98b/57568042703.pdfIn PDF document text
    • http://dhs1959reunion.com/clients/871764/File/76201331640.pdfIn PDF document text
    • http://ardechetendancebrut.fr/userfiles/ardechetendancebrut.fr/file/felizalufepe.pdfIn PDF document text
    • https://www.euroservicemilano.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607abf4ded315---31285943557.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=the+song+of+sparrows+full+movie+with+english+subtitlesPDF 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_off0000d1c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1C8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e9da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9DA 16584 bytes
SHA-256: 9aebf90156748a7c76b3467c8ca05ca20c7e12c22519f3f7abc5613a533a3edb
font_02_sfnt_off000114eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114EB 11160 bytes
SHA-256: 5bf10e274625bae51fa9be603bcb1a470120f87e00b90b8daf7664a7b4faaedd

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