Malicious PDF — malware analysis report

Static analysis result for SHA-256 dec972635dd74ffe…

MALICIOUS

PDF

96.6 KB Created: 2021-09-05 16:20:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 03efc2dabd93065f2329bba16e458bb6 SHA-1: fd27bafdbaeaaee1e9402ef01c9ab285f5b9e359 SHA-256: dec972635dd74ffe66a2ce3bcc0e15f299c66505db25bb1f86ea68a3db06a28b
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many of which point to compromised WordPress sites and disposable hosting, indicating a link farm designed to distribute malicious content. ClamAV detected this file as Pdf.Phishing.Trojan, and the ML classifier also flagged it as malicious. The primary function appears to be directing users to external, potentially harmful URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609e14f51f5c6---xuvexaxet.pdf In PDF document text
    • http://in-dapt.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0607b1d5f7---36055412589.pdfIn PDF document text
    • https://aldaserwis.pl/ckfinder/userfiles/files/vukuz.pdfIn PDF document text
    • http://spiregene.com/image/files/20210817_005039.pdfIn PDF document text
    • https://facade-metal.ch/ckfinder/userfiles/files/guzorazofavozozovunisaguv.pdfIn PDF document text
    • http://cl-metalparts.com/d/files/52769239334.pdfIn PDF document text
    • https://economiadecomunion.com/ckfinder/userfiles/files/nutibovuladewivodebafot.pdfIn PDF document text
    • https://infotechsystemsonline.com/ital/www/img/file/jerawitoresumovitufumibol.pdfIn PDF document text
    • https://baptistfriends.org/media/68659967177.pdfIn PDF document text
    • https://mvmdigital.gr/files/files/60648521753.pdfIn PDF document text
    • https://anandalaya.in/resources/file/lifubolagepurax.pdfIn PDF document text
    • http://uat2.hkha.com.hk/ckfinder/userfiles/files/towefofimure.pdfIn PDF document text
    • http://challendor.com/fckeditor/upload/file/memonakofura.pdfIn PDF document text
    • http://antwerp-rentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b9d34503c57---webefaka.pdfIn PDF document text
    • https://astoriareiki.com/wp-content/plugins/super-forms/uploads/php/files/30f63383533bbf713df743acce1d69c5/296219304.pdfIn PDF document text
    • http://platcometals.com/images/file/38273279467.pdfIn PDF document text
    • http://zge-led.com/luodan/images/userfiles/file/teponerovomififobezo.pdfIn PDF document text
    • https://palet-school.com/files/files/takozo.pdfIn PDF document text
    • http://barcelonahotel.vn/UpLoadFile/file/pugovolevofudifas.pdfIn PDF document text
    • http://geology.ie/wp-content/plugins/formcraft/file-upload/server/content/files/16090172bcbe11---soganojugezux.pdfIn PDF document text
    • https://aquariumfargo.com/wp-content/plugins/super-forms/uploads/php/files/c2fa4420e602b1408beaf836e638ba8e/62890607771.pdfIn PDF document text
    • https://soccerauquebec.com/userfiles/file/21954511567.pdfIn PDF document text
    • http://dh-life.com/ckfinder/userfiles/files/43575157836.pdfIn PDF document text
    • http://tafgambiatours.com/userfiles/file/nigotobineset.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=tutorial+dreamweaver+cs6+bahasa+indonesia+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_off0001119e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1119E 11408 bytes
SHA-256: e6d96492f1e0f4d430c2fc20442b13623ccffdf022acb3741815d644bc42a51e
font_01_sfnt_off00012c2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C2D 18240 bytes
SHA-256: 729e7f39abc3673846f25551c03301e59bd3e9263b059585dd027329f405667f
font_02_sfnt_off00015bff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15BFF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1