Malicious PDF — malware analysis report

Static analysis result for SHA-256 79b353c6c06a5821…

MALICIOUS

PDF

80.7 KB Created: 2021-09-19 20:23:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 568acab6f2b6a7f39390b028a76cc46c SHA-1: 3355871b8ffa43b11c9bc217b52d7b7b76a7afad SHA-256: 79b353c6c06a58212393bddc8b7d8aa9bf200ad4b0c01a8e33b2baaa86e52d4b
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. It contains numerous embedded URLs that form a link farm, with several pointing to compromised WordPress sites or disposable hosting, suggesting a phishing or malware distribution scheme. The document body is heavily obfuscated and appears to be non-readable content, further supporting the malicious nature of the file.

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://cructi.ru/uplcv?utm_term=moto+z2+force+update PDF link annotation
    • https://sapporopools.com/contents/files/bitoluduwumajilibanituri.pdfIn PDF document text
    • http://emanuelmlevin.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/15069833797.pdfIn PDF document text
    • http://www.oiseaubleu-promo.fr/userfiles/file/musixajivijimeras.pdfIn PDF document text
    • https://unique.global/wp-content/plugins/super-forms/uploads/php/files/172a73c80820169b79f7c77f8af02561/dugux.pdfIn PDF document text
    • https://semsaesp.com/ckfinder/userfiles/files/tefuxuveporozifoku.pdfIn PDF document text
    • http://laihoawedding.com/app/webroot/upload/files/pewifovomidab.pdfIn PDF document text
    • http://saigonford3s.com/uploads/2021-09-16/images/files/28887059577.pdfIn PDF document text
    • http://dalnoboy.net/data/filestorage/upload/files/10644685698.pdfIn PDF document text
    • https://walterchiropracticclinic.com/home/walter/public_html/ckfinder/userfiles/files/55204485856.pdfIn PDF document text
    • https://dubigroup.com/admin/fckeditor/editor/filemanager/connectors/upload/file/54702841970.pdfIn PDF document text
    • https://ehbo-oostkapelle.nl/userfiles/file/30993491012.pdfIn PDF document text
    • https://alkoplast.rs/files/49791025559.pdfIn PDF document text
    • http://fioredda.com/userfiles/files/224137336.pdfIn PDF document text
    • https://tungafilm.com/dorceiys/ckfinder/userfiles/files/24980969061.pdfIn PDF document text
    • http://mywayrtk.info/userfiles/file/86293697944.pdfIn PDF document text
    • https://hotelexpert.ro/uploads/files/saxutokekazulorajil.pdfIn PDF document text
    • https://kudamatsu.org/userfiles/file/molawabiparidi.pdfIn PDF document text
    • https://coachtourbusrental.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e2839e5d49---25326934499.pdfIn PDF document text
    • https://duext.com/wp-content/plugins/super-forms/uploads/php/files/78167271bd0b0ef066ce78511adcf179/40211113980.pdfIn PDF document text
    • http://bakineshr.az/ckfinder/userfiles/files/ninukadozun.pdfIn PDF document text
    • http://jia-longsofa.com/uploadpic/jialong151126/files/202109190251003776.pdfIn PDF document text
    • https://jordanadams.com/ckfinder/userfiles/files/nutoduweromiwusorurigeb.pdfIn PDF document text
    • http://kco.su/userfiles/file/87499976135.pdfIn PDF document text
    • https://podiummagazinenews.com/ckfinder/userfiles/files/safitorunajodurunegadi.pdfIn PDF document text
    • http://sutipatika.hu/userfiles/files/72213423209.pdfIn PDF document text
    • http://kxqcgs.net/filespath/files/20210918160718.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_off0000d68c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD68C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ee9e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE9E 17764 bytes
SHA-256: d9f7e2000ead60f55bf83bd358f880360f3f3e66cb1b1b9baa102d5dbec80af1
font_02_sfnt_off00011cf0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CF0 10476 bytes
SHA-256: df0c7b2c2f5a8a6efdc874508adfc6335b17e2967417cdc996ae7880c1ebdee5

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