Malicious PDF — malware analysis report

Static analysis result for SHA-256 8b83adc497047a1c…

MALICIOUS

PDF

72.1 KB Created: 2021-09-22 18:16:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 051d39ea568ff0e5785318a7d4c1a101 SHA-1: 713e170e8ceb9012408445085f022cc2763dde9e SHA-256: 8b83adc497047a1cc38fb0d37cf9f87e8f53d9c94fcb7ba139049d5b5d96c3b0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. It contains numerous embedded URLs that point to potentially compromised websites or link farms, suggesting a phishing or malware distribution scheme. The PDF structure and embedded links are consistent with techniques used to lure users to malicious sites, likely as part of a spearphishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://huntic.ru/uplcv?utm_term=app+gps+map+camera PDF link annotation
    • http://studiorestagno.eu/userfiles/files/64764016572.pdfIn PDF document text
    • https://cobaltinc.org/userfiles/file/89281626415.pdfIn PDF document text
    • http://fcv-bo.org/data/fcv-bo/userfiles/file/wiganexomiravotasaved.pdfIn PDF document text
    • https://99shayari.in/userfiles/files/30031895737.pdfIn PDF document text
    • http://lex-ter.ru/admin/ckfinder/userfiles/files/27826174046.pdfIn PDF document text
    • http://wecans.net/_UploadFile/Images/file/kipibibowolirebemupig.pdfIn PDF document text
    • http://niszczeniewaw.pl/userfiles/file/nodexulifu.pdfIn PDF document text
    • http://pomocnaukowa.net/Upload/file/71038634312.pdfIn PDF document text
    • http://ajtoablakcentrum.com/_user/file/57736245662.pdfIn PDF document text
    • http://eperon-kochersberg.com/img_db/soborakaf.pdfIn PDF document text
    • http://zae.me/datafiles/file/vizenovufeweba.pdfIn PDF document text
    • http://5percent-design-action.com/upload/users/files/tafojubowiwilarogem.pdfIn PDF document text
    • http://camel-republic.com/media/userfiles/files/69945535773.pdfIn PDF document text
    • https://joyfool.art/wp-content/plugins/super-forms/uploads/php/files/0c3dacb1b9038567bc2979b8061a6693/kapafubalogimogedeka.pdfIn PDF document text
    • https://www.accidentinjurylascruces.com/wp-content/plugins/super-forms/uploads/php/files/vc300frc9mcfj19ohmf23k90bo/39705276935.pdfIn PDF document text
    • http://jingyitech.com/uploadfile/46977352551.pdfIn PDF document text
    • https://photographerin.agency/wp-content/plugins/super-forms/uploads/php/files/9g5gi5ofh8oacu80t3gackugs0/58603596973.pdfIn PDF document text
    • http://xaydunghoangthanh.com/img_duhoc/files/potutozek.pdfIn PDF document text
    • https://h16hr15k-h19hr37urn.com/contents/files/20546351783.pdfIn PDF document text
    • https://proartgaleria.hu/files/files/53006432315.pdfIn PDF document text
    • http://dailyliving.nl/ckfinder/userfiles/files/dapejibexevukomuj.pdfIn PDF document text
    • http://fjzy18.com/image/uload/files/gifupekurovitasolixu.pdfIn PDF document text
    • https://libertyrealestate.in/ckfinder/userfiles/files/24236948899.pdfIn PDF document text
    • 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_off0000b9c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB9C2 16560 bytes
SHA-256: bab035398fb198e21bf62c3c83325a685a7cd3a75a1ed958e3cba3afe598ee92
font_01_sfnt_off0000e488.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE488 10236 bytes
SHA-256: 4f9914ecf28578debf90cf2daa247820aca1aec2435a9538efdeb12f90d2a28b
font_02_sfnt_off0000fb8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB8C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1