Malicious PDF — malware analysis report

Static analysis result for SHA-256 9101bf417e2a3d0f…

MALICIOUS

PDF

86.0 KB Created: 2021-10-05 11:12:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 63987689cecbf9e2b8468ae1963368b0 SHA-1: 5bfd4179ffea703006b95644e243650ba98718a2 SHA-256: 9101bf417e2a3d0f74a6916458e9ec6245dd876675267d1125731f7de9bd5dc4
156 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, with numerous URLs pointing to compromised WordPress sites and other domains, suggesting it's used to distribute phishing content or further malware. The presence of external URIs and compromised CMS upload links strongly supports its role as a distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://archism.ru/uplcv?utm_term=thermal+energy+for+a+change+of+state+equation PDF link annotation
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/71e9d5d72e660d44e75acc7cdede690c/17217585525.pdfIn PDF document text
    • http://triumphtoday.org/wp-content/plugins/formcraft/file-upload/server/content/files/1614bb1fdd67d7---sukixurikinilunajupale.pdfIn PDF document text
    • https://safe-international.com/userfiles/file/88268701608.pdfIn PDF document text
    • https://sitycare.com/FCK-UserFiles/files/razosinaxum.pdfIn PDF document text
    • http://andreuma.madteam.net/ckfinder/userfiles/files/14080369971.pdfIn PDF document text
    • http://prvugkh.ru/uploads/files/49783503560.pdfIn PDF document text
    • https://simovi.mx/wp-content/plugins/formcraft/file-upload/server/content/files/16148aee1bed24---14024679801.pdfIn PDF document text
    • https://bbpartner.cz/userfiles/file/xuvagilemapagimugovuturif.pdfIn PDF document text
    • http://diakmelo.hu/ckfinder/userfiles/files/76303037233.pdfIn PDF document text
    • https://wisestudentz.com/userfiles/file/23857477359.pdfIn PDF document text
    • http://www.southforconstruction.com/frontend/web/ckfinder/userfiles/files/85002318584.pdfIn PDF document text
    • https://kvartira-zalog.ru/wp-content/plugins/super-forms/uploads/php/files/6d9f45f1c47ae543aa0e2a0340f169ba/simivif.pdfIn PDF document text
    • http://wecans.net/_UploadFile/Images/file/76016676175.pdfIn PDF document text
    • http://seowonbattery.com/files/fckeditor/file/1670212214614f72df06869.pdfIn PDF document text
    • https://selispin.net/calisma2/files/uploads/watave.pdfIn PDF document text
    • https://www.sonorisation-auxerre.fr/ckfinder/userfiles/files/59958380440.pdfIn PDF document text
    • http://managhantasala.net/mailuserfiles/file/82722247559.pdfIn PDF document text
    • http://aokunoil.com/ckfinder/userfiles/files/2837686312.pdfIn PDF document text
    • http://aktifithalat.com/resimlerfiles/rirapigeruro.pdfIn PDF document text
    • http://k2plusinterior.com/userfiles/33817186625.pdfIn PDF document text
    • http://triumphtoday.org/wp-content/plugins/formcraft/file-upload/server/content/files/16145d24bed27c---24569058810.pdfIn PDF document text
    • http://hattrick-sports.com/wp-content/plugins/formcraft/file-upload/server/content/files/16153cf01db6c2---fodiv.pdfIn PDF document text
    • http://feynburg-uhren.de/uploads/satopesagutipuvotakiladef.pdfIn PDF document text
    • http://helderlive.nl/ckfinder/userfiles/files/zoranepuwu.pdfIn PDF document text
    • http://offerparts.com/upload/files/84583320658.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_off0000e742.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE742 11108 bytes
SHA-256: 0e36028e1760915fddd77ea3362dc83990a973840676060071cd7104be59683a
font_01_sfnt_off000100b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100B6 19388 bytes
SHA-256: 30f9744abba6248a9c582700936e429f2cafda66f76fc34387bb11dc9496e925
font_02_sfnt_off00013236.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13236 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.