Malicious PDF — malware analysis report

Static analysis result for SHA-256 7141fcccc14a56d2…

MALICIOUS

PDF

84.9 KB Created: 2021-06-29 12:49:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 5de5b497bc36abcd5addb4bd0ff8c431 SHA-1: cb1394c4fabaae1416c5f09ef1873f8868b4b2b3 SHA-256: 7141fcccc14a56d2747e81a4d44d07801621f11b60573c602df129c2f7e6ac8a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised WordPress sites, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://synerhu.ru/uplcv?utm_term=law+of+gravitation+given+by
    • https://militarynetwork.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160874695cc1a6---toreluj.pdf
    • https://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c4695080931---gupimezefutejewopobaw.pdf
    • https://europeancustomtailor.com/wp-content/plugins/super-forms/uploads/php/files/00670f2a185ec5bd2d7b2765ce26a48a/72957570702.pdf
    • https://shrmivirtual.org/wp-content/plugins/super-forms/uploads/php/files/024d01be61a7f6fb8c2863bdf88172e5/pifevafosofofimopef.pdf
    • http://axwelindia.com/uploads/fudixagazesajolukoxupop.pdf
    • https://pousadamarazul.tur.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608536a54b879---zipebanov.pdf
    • https://senzedigicraft.com/wp-content/plugins/super-forms/uploads/php/files/46ccf309cd11b49c833bb573661194a3/39647334949.pdf
    • https://www.andeanskyline.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b06870113b8---65077579243.pdf
    • http://malagi.pl/user-files/fck/file/47949168333.pdf
    • https://advancedbusiness.co/wp-content/plugins/super-forms/uploads/php/files/04eef4f09d5b921b9b9f86e8e6620ab1/49776180065.pdf
    • https://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/3e4b43aba6e0bec520918ce0efefdc91/74886592883.pdf
    • https://www.onestopnaturalstore.ca/wp-content/plugins/super-forms/uploads/php/files/n1dd34shgfnfccq2b5svvks14r/gatadimufemivivarinakif.pdf
    • https://www.bluegreenshouseboats.in/wp-content/plugins/formcraft/file-upload/server/content/files/160759312e0b2f---33787539093.pdf
    • http://www.cheapmotorcycleinsurancepa.com/wp-content/plugins/super-forms/uploads/php/files/otp7drc97fabkgc7hvqumdehp0/61806425335.pdf
    • http://www.xpresswedding.com/wp-content/plugins/formcraft/file-upload/server/content/files/160848dd16bc1b---60246612924.pdf
    • http://taiwan-casters.com/userfiles/file/vedutawap.pdf
    • https://puertoestereo.com/wp-content/plugins/super-forms/uploads/php/files/cj01b555dn50d1jc3896t5vu3n/1721588513.pdf
    • https://hps-gruppe.com/wp-content/plugins/super-forms/uploads/php/files/l0s5nabqmdi8sh6kn8jcnu89tf/60112547278.pdf
    • https://goldengrowers.com/wp-content/plugins/super-forms/uploads/php/files/e8d36ac2811ffadfdb6bc5ed9bdf224c/lijozuxexozeriwagadapur.pdf
    • http://www.orhancoskun.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf7e463e1af---kubeduwoxisivetisugigu.pdf
    • http://trackeg.com/en/wp-content/plugins/formcraft/file-upload/server/content/files/1607ed7281ae0a---38680473800.pdf
    • https://cffcommunications.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/160a9b36902c6a---38927540003.pdf
    • http://gibisch.org/files/files/10726717198.pdf
    • http://lagostena.it/userfiles/files/wefanidupali.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • 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://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_off0000e89c.bin
1cd09adc9c59b891a5f2a3d1d96d1a7c655e4e9e222d2b67179218fd7e4a1b3c
pdf-font-stream PDF embedded font (sfnt) at offset 0xE89C 17524 bytes
font_01_sfnt_off000115f7.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x115F7 16792 bytes
font_02_sfnt_off00012e0e.bin
b889f0fed18cb4e3b589859c524340e67b788fb924f3db7da6a46eaf502fbaab
pdf-font-stream PDF embedded font (sfnt) at offset 0x12E0E 10540 bytes