Malicious PDF — malware analysis report

Static analysis result for SHA-256 2293d7a1f24985d8…

MALICIOUS

PDF

88.2 KB Created: 2021-09-18 04:29:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: d02047470bca9c51118dcec542c88d5a SHA-1: f903e0e7933c107e1f7029b01f5352227c408c4f SHA-256: 2293d7a1f24985d893372753206cef4b93d193590b98eefc3cbb84e7865a76a4
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple potentially compromised or disposable hosting sites. The document body is heavily obfuscated, preventing a clear understanding of its specific lure, but the overall structure and detection suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://droprint.my/home/ququ4923/public_html/userfiles/file/50967473043.pdf In PDF document text
    • http://shiraz.sk/ckfinder/userfiles/files/rorusakulotopitosadu.pdfIn PDF document text
    • http://matchedtubes.de/userfiles/file/5331039407.pdfIn PDF document text
    • https://www.sonorisation-auxerre.fr/ckfinder/userfiles/files/senalozibinuxa.pdfIn PDF document text
    • http://rentaruedas.com/files/others/33148300105.pdfIn PDF document text
    • https://lienlacanien.com/img_pages/file/vexovuboranevezakivaravos.pdfIn PDF document text
    • http://lukoilmarine.com/ckfinder/userfiles/files/59348080603.pdfIn PDF document text
    • http://ducthanggroup.com/webroot/img/files/vanowenetipofexuburepabu.pdfIn PDF document text
    • http://nordicwalkingturak.hu/_user/file/21576550852.pdfIn PDF document text
    • http://carneslaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/93655708659.pdfIn PDF document text
    • https://learningsolution.ca/userfiles/files/34077283631.pdfIn PDF document text
    • http://arabstina.com/ckfinder/userfiles/files/45996766917.pdfIn PDF document text
    • http://e5tbr.alruaa.com/ckeditor-ckfinder-integration/uploads/files/tanebixugejijediruwukedaf.pdfIn PDF document text
    • http://www.civilhospitalpalampur.in/img/uploads/files/rolajozijamu.pdfIn PDF document text
    • http://abwingscolley.com/uploads/files/rotexaxekanufisexa.pdfIn PDF document text
    • https://muguet.fr/sites/default/files/file/semibizazibesitu.pdfIn PDF document text
    • http://www.saraviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b8e7183c57---gefodexugiro.pdfIn PDF document text
    • https://vmkstroi.ru/wp-content/plugins/super-forms/uploads/php/files/98a105a06df77bf8c7d6dc1309f3c67f/kuvusu.pdfIn PDF document text
    • https://fatheragneliti.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130ec4c6012d---bogozugabejeruzerola.pdfIn PDF document text
    • http://rdmsrl.it/userfiles/files/12587837328.pdfIn PDF document text
    • https://dveropolis.ru/upload_picture/39266617473.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=sqlite+master+proPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dbad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBAD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f3bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3BF 18804 bytes
SHA-256: 604b40e4991573d879bf563603c36aca6ace114a81c84281f273c0f2921a85cd
font_02_sfnt_off0001241e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1241E 10532 bytes
SHA-256: e54d369e530fddf7b121cbf3edc1b333b069d882a5a48b8f5c84a3e98c29084c
font_03_sfnt_off00013c10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C10 16448 bytes
SHA-256: 0e4cde3d5bdd5452960de995a4807c8da4ec665155a9812e2f8e54e6c49b7878

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