Malicious PDF — malware analysis report

Static analysis result for SHA-256 6294a3fcf9525de2…

MALICIOUS

PDF

82.9 KB Created: 2021-09-03 13:05:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 08a9d7294c79c2fc0f18960929165f38 SHA-1: e2efd64449e7b5808b3e19e94c759c57898f146b SHA-256: 6294a3fcf9525de225559bec067a44b025baf034aa918dea3289ecee299a6119
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, with numerous embedded URLs pointing to potentially compromised websites or disposable hosting. These links are likely intended to lure users to phishing sites or download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://garglob.ru/uplcv?utm_term=word+file+convert+to+pdf+software+free+download PDF link annotation
    • http://fiumevivo.it/userfiles/files/57679159481.pdfIn PDF document text
    • http://studioagm.it/userfiles/files/wizodajiwegofozunajuko.pdfIn PDF document text
    • http://nusamulticentralestari.com/Uploads/userfiles/files/zinezexabamodefigu.pdfIn PDF document text
    • http://naszymsladem.pl/upload/file/wigiz.pdfIn PDF document text
    • http://jfhcoaching.nl/userfiles/files/debejonowanipideb.pdfIn PDF document text
    • https://gites-les-bardots.com/userfiles/file/56260706427.pdfIn PDF document text
    • http://gillsandgeckos.com/userfiles/file/zexomazolabufuwax.pdfIn PDF document text
    • http://kameleonhastanc.hu/files/file/64466150161.pdfIn PDF document text
    • https://ancoraeducacion.com/images/66893414261.pdfIn PDF document text
    • http://www.reroofingbrisbaneqld.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607152ac0eb74---lowukonulizatitom.pdfIn PDF document text
    • https://faresaldabbous.com/uploads/files/tunoruweguxemalekudoroxut.pdfIn PDF document text
    • http://stroynerud-sm.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1606c8e477d478---vowifoviw.pdfIn PDF document text
    • http://k2plusinterior.com/userfiles/piwuzapalikabupexisurezap.pdfIn PDF document text
    • http://perlawarmii.pl/userfiles/file/musujarekabivoforozev.pdfIn PDF document text
    • https://teenvolunteerhouston.org/wp-content/plugins/super-forms/uploads/php/files/537e5d2ae4465b44a080b3a9c6df9491/36878366399.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607739d671600---76838971169.pdfIn PDF document text
    • http://pvsystexperts.com/wp-content/plugins/super-forms/uploads/php/files/g7c5hno21ia0jemlv1au74t543/79193457307.pdfIn PDF document text
    • http://jshtextile.com/UserFiles/file///29083901079.pdfIn PDF document text
    • http://sireny.net/share/files/72690515666.pdfIn PDF document text
    • http://www.psstrecno.sk/wp-content/plugins/formcraft/file-upload/server/content/files/160970c6d75aae---6970520285.pdfIn PDF document text
    • http://alvasari.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610bb7a1136d8---rojebonewu.pdfIn PDF document text
    • http://greer2001.com/clients/e/ea/ea56749d84c1a2d7db36d2c51c833a37/File/givurewaxubizefigaramubin.pdfIn PDF document text
    • http://tpdw.pl/userfiles/file/30104794665.pdfIn PDF document text
    • http://kaizenlife.com/ckfinder/userfiles/files/32498806677.pdfIn PDF document text
    • https://oiweld.com/wp-content/plugins/super-forms/uploads/php/files/9cd5436dc3c3e28951b79ed990210927/jezuf.pdfIn PDF document text
    • http://uceng.net/_UploadFile/Images/file/54759530467.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_off0000df02.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF02 17348 bytes
SHA-256: cf399a41f93364cb7a1077cbf3c9122522df0692d5862c2b4e1e7fd31378a87f
font_01_sfnt_off00010c2e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C2E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012445.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12445 10760 bytes
SHA-256: 3259ee5b826b955d801b4c2cf26c5ce5f71c887c41ab04f58e20abb85b468b03

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