Malicious PDF — malware analysis report

Static analysis result for SHA-256 c54e3009ee4b0daa…

MALICIOUS

PDF

97.8 KB Created: 2021-07-04 21:12:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 97535ed1a3b5e15de8d9ac81a16394eb SHA-1: 34c6fad44990ec3df01fe162b5d8e7b0f97a7bae SHA-256: c54e3009ee4b0daa3e59d9f0dc4de0084ed894aa57d3a1ef30ffc04533be7fed
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URIs and link farms pointing to potentially compromised websites, as indicated by heuristics like PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM and PDF_SEO_DISPOSABLE_LINK_FARM. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution through these links. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9922

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://www.kiakaha.gr/wp-content/plugins/super-forms/uploads/php/files/m7a6f0t6cu9ncabuno46rjt8pt/15560998122.pdf
    • http://travelshops.pl/userfiles/file/gezulov.pdf
    • https://enville.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d22bc7b5766---44823297435.pdf
    • http://artmetinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/160875c182e59b---595821480.pdf
    • https://dezsredstvompx.ru/wp-content/plugins/super-forms/uploads/php/files/727dd94b54205ed44a77df0448940d54/zawipajulerotubi.pdf
    • http://ledson.ru/upload_picture/58260318520.pdf
    • https://chung-pei.com/userfiles/file/53283033712.pdf
    • http://yossy.biz/userfiles/file/20081090781.pdf
    • http://itfind.ru/uploads/file/faxoxamabimuvutadujewiwub.pdf
    • http://greathorserider.com/ckfinder/userfiles/files/fukerapoxo.pdf
    • http://inlikeflintlogistics.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e26a231eee---nevejo.pdf
    • http://www.luminicaambiental.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b26bc09600---xebefepezajedabilivo.pdf
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b15da9e10d---jodemaleponovujasowe.pdf
    • http://www.peopleoftheheath.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a22e720318c---78145393223.pdf
    • https://srmhomes.com/images/bulk_images/files/39970080629.pdf
    • https://amirep.com/wp-content/plugins/super-forms/uploads/php/files/ce6a3945ccb02822ceb234b1e3294b2a/tutilowisopesorexakuwupu.pdf
    • http://www.carolglassman.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070a27ddb757---sagiluvison.pdf
    • http://samrayburnclassof1980reunion.com/clients/873185/File/rekisefetujenutuwege.pdf
    • https://tcufroghouses.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609650d293b0c---28854963868.pdf
    • http://www.yourhealthyourchoice.org/wp-content/plugins/formcraft/file-upload/server/content/files/160be5bcb066db---36122048442.pdf
    • https://skyzoan.com/cake/beta/userfiles/file/kozuzemavibuloxonexis.pdf
    • http://kyanite.tv/userfiles/file/55563290027.pdf
    • http://bogelaipigeon.com/upload/file/xokosukojesadimadedi.pdf
    • http://sciencevier.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac67f2d1eb5---mokatu.pdf
    • http://gowowdeli.com/uploads/files/31756437265
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=database+management+system+mcq+questions+with+answers+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_off000118df.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x118DF 16792 bytes
font_01_sfnt_off000130f1.bin
f50230789b1c02173cc99cba2a7c5c0ea58909a46adc56d0b2886950c6d68c15
pdf-font-stream PDF embedded font (sfnt) at offset 0x130F1 17524 bytes
font_02_sfnt_off00015ebd.bin
e3904f1a78ca7c20209bed6001747db61cf7f7d04c266b1a35b29c084b8b598f
pdf-font-stream PDF embedded font (sfnt) at offset 0x15EBD 11608 bytes