Malicious PDF — malware analysis report

Static analysis result for SHA-256 82a98bcdaa2c7639…

MALICIOUS

PDF

78.6 KB Created: 2021-09-10 04:46:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 0254a5d9534731beae057ab24d1298bc SHA-1: 679df2ebd140adba0773869a88f95118046700d5 SHA-256: 82a98bcdaa2c763976f12cc21401d960d6a0f9463005d30561d8587568119ee9
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with numerous embedded URLs pointing to various domains, some of which are associated with compromised CMS uploads or disposable hosting. The document body is heavily obfuscated, preventing analysis of its direct content, but the overall structure and URL distribution strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://healingtown.org/userData/board/file/zatirowokomovidopi.pdf
    • http://rivucota.com/upload/files/16888698179.pdf
    • http://aadcnfgl.netsociality.com/upload/files/98069006829.pdf
    • http://faw-asia.com/image/upload/files/35871470967.pdf
    • https://torgradio.ru/new/files/file/fusesidodeguwexokivip.pdf
    • https://jagamimpi.net/contents/files/57160658142.pdf
    • http://etabetasurvey.com/userfiles/files/wererabagarururuziz.pdf
    • http://dietaltop.com/userfiles/files/54088374407.pdf
    • https://merohamro.com/ckfinder/userfiles/files/renoba.pdf
    • https://syntellect.ru/Repository/file/11768247927.pdf
    • https://sealordhotels.com/ckfinder/userfiles/files/57849763300.pdf
    • https://buzascsaba.hu/userFiles/file/39568005179.pdf
    • https://madame-tina.com/ckfinder/userfiles/files/29119498772.pdf
    • http://mislenyiallatorvos.hu/userfiles/file/jilivipel.pdf
    • https://ciela13.leaddeehub.com/userfiles/files/binananokifofatusulub.pdf
    • http://www.gyndoktors.de/ckfinder/userfiles/files/pawaloriduk.pdf
    • http://www.cargeacrew.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1612fa6bf09ffe---badogedubumademigulunix.pdf
    • https://www.advids.co/wp-content/plugins/formcraft/file-upload/server/content/files/161342169adcb9---vizunatabinuvuji.pdf
    • http://donateagift.eu/userfiles/file/sejanemamada.pdf
    • https://xedulichhaiphong.vn/images/news/files/75992435676.pdf
    • http://biemmecommerciale.eu/userfiles/files/90152836069.pdf
    • http://dabaizhongxue.com/upload_fck/file/2021-9-1/20210901091725181507.pdf
    • http://denis-lefebvre-services.com/fichiers/file/14511355287.pdf
    • http://robertfeinberglaw.com/images/edit_images/file/12040871908.pdf
    • http://traditionsradio.com/wp-content/plugins/super-forms/uploads/php/files/692b6832ccbf5c4a538890e953f0ee15/runegidizagabepivenap.pdf
    • https://currenwatch.myhost360.cn/file/upload/files/09-09-03-10-30-19.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=40+inch+orient+led+price+in+pakistan
    • 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_off0000cc6d.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xCC6D 16792 bytes
font_01_sfnt_off0000e484.bin
bcc7cfefaa0af97af18d32a5fb84a1b16a249e9240e7f6740135a3a52ca365ee
pdf-font-stream PDF embedded font (sfnt) at offset 0xE484 10808 bytes
font_02_sfnt_off0000fd4e.bin
07f62c60115ffa68201b40caf15eda336bb4ea024433239d5d11d2763ac11cbf
pdf-font-stream PDF embedded font (sfnt) at offset 0xFD4E 18028 bytes