Malicious PDF — malware analysis report

Static analysis result for SHA-256 7c8cbff099a3f0a5…

MALICIOUS

PDF

81.3 KB Created: 2021-09-05 18:35:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 67172605110ebf5f3b4a4076368c6822 SHA-1: 3700754e9566e1036f9c52de61a7a5690c3b88d7 SHA-256: 7c8cbff099a3f0a53f752e38aab1e23e04c9e49469409196494839c317034e5c
156 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URLs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to manipulate search engine results or redirect users to malicious content. ClamAV detected this as Pdf.Phishing.Trojan, and the ML classifier also flagged it as malicious. The primary attack pattern involves directing users to external, potentially compromised, resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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 http://yossy.biz/userfiles/file/mobede.pdf In PDF document text
    • http://fluitec.fr/ressource/site-image/files/puzidix.pdfIn PDF document text
    • http://tourbusan.net/FileData/ckfinder/files/20210619_4765E826BE50CB09.pdfIn PDF document text
    • http://bungefamily.com/clients/5233/File/kufadopukufeb.pdfIn PDF document text
    • https://www.scanworld.se/wp-content/plugins/formcraft/file-upload/server/content/files/160a87ef355d6c---tadujidizewafu.pdfIn PDF document text
    • http://alvasari.com/wp-content/plugins/formcraft/file-upload/server/content/files/160816dce6d0c4---pafafubanunitosoxate.pdfIn PDF document text
    • https://tatsolarlight.com/uploads/files/nipuxuduvikararozek.pdfIn PDF document text
    • http://phamtrangia.com/upload/files/42555803024.pdfIn PDF document text
    • https://rodolphe-blanchet.fr/Rodolphe/fckeditor/file/8359905011.pdfIn PDF document text
    • http://www.platformliften.info/wp-content/plugins/formcraft/file-upload/server/content/files/16083c2278ed40---fozufagogego.pdfIn PDF document text
    • https://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/96da3d458be3dd39a65e8bd7f86d86f8/31379513599.pdfIn PDF document text
    • http://precisao.org/files/files/nabowubo.pdfIn PDF document text
    • http://inspirationallabels.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16075c0c9b58c4---48118905923.pdfIn PDF document text
    • http://aliglobshop.com/userfiles/file/sutavelewenapiwupibad.pdfIn PDF document text
    • http://pure-chiral.com/upload/files/sukularipuw.pdfIn PDF document text
    • https://www.baileysmilk.com/wp-content/plugins/super-forms/uploads/php/files/15baa257550a2102399fe92673d8aaf2/rakomaxubalimidev.pdfIn PDF document text
    • http://softwarefactory.nl/images/file/63484034033.pdfIn PDF document text
    • http://hepiran.com/cache/fck_files/file/jivisuneguzobatufuleva.pdfIn PDF document text
    • http://xsteelstock.com/d/files/99577523173.pdfIn PDF document text
    • https://k-kompany.ru/wp-content/plugins/super-forms/uploads/php/files/7becd424c8cc271bdb64e75931dbdcee/kurafuduwaloxujegovi.pdfIn PDF document text
    • https://istanbulbalbir.com/upload/ckfinder/files/befigijog.pdfIn PDF document text
    • https://szalkasszorutacskok.hu/app/webroot/files/content/files/fabutemuvojifewitizelatel.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=levi+ladut+pdfPDF link annotation
    • 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_off0000d5cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5CC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000edde.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDDE 19140 bytes
SHA-256: ba218e61eb4baa7661ffbc1a84a326a9f76251d1c10e4cc82f1861e95cb2a59e
font_02_sfnt_off00011ffa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FFA 10120 bytes
SHA-256: dbcaadddcfb24abfaa83b98f5e5f75830c1e4a71f78f896fa30e5d1e9b9b6a28

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