Malicious PDF — malware analysis report

Static analysis result for SHA-256 aa0cb2b111397adc…

MALICIOUS

PDF

76.0 KB Created: 2021-06-12 08:25:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4ba0ed9db2ea79c5e6607cf335cab794 SHA-1: 14576ca484af9a6ce065eb6df238d9adee66bf88 SHA-256: aa0cb2b111397adc72447a3a7084ceaf446c751da9d57f832138b186be9c0472
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file contains numerous external links, many hosted on compromised WordPress sites, indicating a link farm designed to redirect users to potentially malicious destinations. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the structure and URL patterns are consistent with a malicious document used as a lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 https://ketchas.ru/uplcv?utm_term=i+love+to+praise+him
    • http://adabaskimerkezi.com/upload/file/35813036635.pdf
    • https://spencershaulageltd.co.uk/wp-content/plugins/super-forms/uploads/php/files/960d9cecad1eeaf577af1c56a2b24c2d/pitiwekutigepug.pdf
    • http://remontnoedelo.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160829ad70e85a---31433180950.pdf
    • http://for-rent-leuven.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070a83178d13---fufademuxasaseju.pdf
    • https://fieldofgreen.com/wp-content/plugins/super-forms/uploads/php/files/dd3b76a4163df55f34755fa48d47037d/lorowiro.pdf
    • https://www.carrentchiengmai.com/files/51962050813.pdf
    • https://www.mclarenpress.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096e77813207---rivutixasajal.pdf
    • https://chmelo.hu/sites/default/files/file/49014202599.pdf
    • http://www.airportlimofortlauderdale.net/wp-content/plugins/formcraft/file-upload/server/content/files/16073106825a7d---35875253180.pdf
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/3159eceb5d3272232bb12bdee1fb2dbb/76306453646.pdf
    • http://vejwun.cz/images/kerukubamafirutitogoxa.pdf
    • http://totaleclipsenv.com/wp-content/plugins/formcraft/file-upload/server/content/files/160948406bbbda---25199594185.pdf
    • http://totaleclipsenv.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607157516b704---pezifonawowefuxoruk.pdf
    • http://aksaxena.com/bpms/includes/fckeditor_uploads/userfiles/file/87607998068.pdf
    • http://melly-incendie.fr/img_db/85419647515.pdf
    • http://sushikyototogo.com/uploads/files/dojibev.pdf
    • https://regeneracion-capilar.com/wp-content/plugins/super-forms/uploads/php/files/0a6c11b7f2b62101966ee06b1c429d86/weseko.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://www.youtube.com/watch?v=RfbXUpjHSJQ��I
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d4f2.bin
43ddd14e97970600cd615195944a57ffe51685954017a341f62507498e2ed740		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD4F2 5056 bytes
font_01_sfnt_off0000e5fb.bin
3e25fe60a16f1e02cf7c16fea5d4bd6e8c79d0c4c4a3a02bddf1530f9d6e0659		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE5FB 10996 bytes
font_02_sfnt_off00010bcb.bin
5446d8693f472ebe56539db1294e6b993809411a69d567c9d8907fa578c39aa0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10BCB 16160 bytes

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