Malicious PDF — malware analysis report

Static analysis result for SHA-256 f6fbd7b1d3ce2524…

MALICIOUS

PDF

92.1 KB Created: 2021-06-30 22:43:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: c65ab6feb3b8563870d65a3478a1c747 SHA-1: d491d9650645487f7866a9bc089c532ea865a7d7 SHA-256: f6fbd7b1d3ce2524c03668525cb0a64e5c912dba2b74cb5b38fd2bf9896448b3
156 Risk Score

Malware Insights

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

This PDF was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier, indicating malicious intent. It functions as a link farm, with numerous URLs pointing to compromised WordPress sites and potentially disposable hosting, suggesting an attempt to distribute malicious content or manipulate search engine results. The presence of multiple PDF link farm heuristics reinforces this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/7a2cef98d4d35b8397c6334755fca399/karevexafisabitupatep.pdf
    • http://in-dapt.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a489a021dd7---17368057531.pdf
    • http://mas.vacations/wp-content/plugins/formcraft/file-upload/server/content/files/160ade247c593f---litolupodixebejakobapa.pdf
    • http://www.platformliften.info/wp-content/plugins/formcraft/file-upload/server/content/files/160b8a2eade52d---jawidokobijisimifelefigo.pdf
    • https://contabil-fiscal.ro/mm/file/36861167430.pdf
    • https://k-newsletter.com/ckupload/files/58340436643.pdf
    • https://alarrabnews.com/images/content/content/file/jiraso.pdf
    • http://rheinmotel.com/userfiles/file/barukemena.pdf
    • http://tamker.hu/userfiles/file/kigunalezorexewobokimo.pdf
    • https://delaneyllc.com/ckfinder/userfiles/files/40973808945.pdf
    • http://ahchala.com/img/file/vemopeja.pdf
    • http://aaaexpressac.com/userfiles/file/laradekazezedowewovekun.pdf
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/cpuu2adturenvespjhfpde7977/14233816170.pdf
    • https://dermatologie-chamonix.com/userfiles/file/soxiliz.pdf
    • http://sinara.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/16095551e1afbb---xavevujelotifudu.pdf
    • https://teenvolunteerhouston.com/wp-content/plugins/super-forms/uploads/php/files/5208be9b264f54d364adac545633454e/56871262698.pdf
    • https://www.teppiche-waschen-hamburg.de/wp-content/plugins/formcraft/file-upload/server/content/files/16075a7a1a421c---24235936480.pdf
    • http://wilkinsconnection.com/clients/9/94/94ba1e7d864c5c8af3bb481f5f9f31de/File/48401958936.pdf
    • https://firsatpin.com/calisma2/files/uploads/vixef.pdf
    • http://dnepropress.net/files/file/gezak.pdf
    • https://nam.it/wp-content/plugins/formcraft/file-upload/server/content/files/160749b804c2ab---tizir.pdf
    • http://dwhs79.com/clients/15834/File/jurajipamoxunuveni.pdf
    • http://workprohealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609765aae9006---loluropunitupaba.pdf
    • http://moscowprice.com/content/xuploadimages/file/waluwuz.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=how+to+cite+a+video+in+chicago+style
    • 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_off000101b8.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x101B8 16792 bytes
font_01_sfnt_off000119ca.bin
b054d1453c12d3cbcd48010a927d58a12dc700cad07c3dc25b467d2067bbd74e
pdf-font-stream PDF embedded font (sfnt) at offset 0x119CA 17828 bytes
font_02_sfnt_off000148b6.bin
6160c2885e5e69950397c726cf1a08bf1501c535fe612127348b83df55f12e76
pdf-font-stream PDF embedded font (sfnt) at offset 0x148B6 10808 bytes