Malicious PDF — malware analysis report

Static analysis result for SHA-256 aa5fa98789ffcd67…

MALICIOUS

PDF

85.7 KB Created: 2021-07-06 05:03:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 9cadf845e05df042d52577b4d3cb45e8 SHA-1: b69602a0865438d421ca50ed0bec46e5a775d206 SHA-256: aa5fa98789ffcd67321782554f70788cafaef9ef38f06e4a0e33702c5aae0cb3
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress sites, suggesting it functions as a link farm for phishing or malware distribution. The ClamAV detection and ML classifier strongly indicate malicious intent. No scripts were extracted, but the structure and embedded URLs are sufficient to infer a malicious link-based attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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 https://krisoc.ru/uplcv?utm_term=power+electronics+for+renewable+energy+systems+notes PDF link annotation
    • https://www.rekalibracija.com/wp-content/plugins/super-forms/uploads/php/files/79824f3e7f30e3ae4f2642e717962949/92344311687.pdfIn PDF document text
    • http://www.mediagrand.hu//data/editorfile/36664502494.pdfIn PDF document text
    • https://ajwatravel.com/wheelmarine/userfiles/file/dusogitujoxiropad.pdfIn PDF document text
    • http://homelife-superstars.com/image/files/54809164023.pdfIn PDF document text
    • http://tremonttemplemacon.com/clients/862779/File/47395106138.pdfIn PDF document text
    • http://kotolantopeni.cz/file/gonafodi.pdfIn PDF document text
    • http://triumphtoday.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c89bc0793ad---renegekefor.pdfIn PDF document text
    • https://moma-restaurant.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f539b03cf0---nulogozazebulonor.pdfIn PDF document text
    • https://www.frontierexim.com/wp-content/plugins/super-forms/uploads/php/files/8lvmc9o3cijjk5phs8aar2777c/71560785420.pdfIn PDF document text
    • https://www.cfo-search.com/wp-content/plugins/formcraft/file-upload/server/content/files/160854e86ca8d6---zovefedudamexezusuba.pdfIn PDF document text
    • https://aquariumfargo.com/wp-content/plugins/super-forms/uploads/php/files/191dfe32b9cc35db92fc41ef5a60cae5/veziturarumigovilaloziwo.pdfIn PDF document text
    • http://www.oiseaubleu-promo.fr/userfiles/file/gozara.pdfIn PDF document text
    • https://inchiriereelicoptere.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1608b16cbc5b2a---ratedituruxesumexeduv.pdfIn PDF document text
    • http://ewhamd.net/upFiles/ckeditor/files/51114045630.pdfIn PDF document text
    • https://outsourcedbackoffice.co.uk/wp-content/plugins/super-forms/uploads/php/files/932d600673dd50153c999849d355caaa/58790779044.pdfIn PDF document text
    • https://cjsc.se/ckfinder/userfiles/files/19234873071.pdfIn PDF document text
    • http://tavernadelsnoguers.com/wp-content/plugins/super-forms/uploads/php/files/2201245727d4e617f9a250d6dd5e6431/77282333381.pdfIn PDF document text
    • https://samiznojmo.cz/wp-content/plugins/super-forms/uploads/php/files/1b589ad02184b4aa5557cf1cc685aff2/24733343645.pdfIn PDF document text
    • http://piqiso.ru/userfiles/file/35167698518.pdfIn PDF document text
    • https://nuevocoach.co.uk/wp-content/plugins/super-forms/uploads/php/files/59681484a89f4dd3b7452c020ee5ab4a/walitel.pdfIn PDF document text
    • https://getlovebooks.com/wp-content/plugins/super-forms/uploads/php/files/31fbe5f1a89b7da1dec263e831b104db/pesofafoxowafukep.pdfIn PDF document text
    • https://elitestrategyglobal.com/wp-content/plugins/super-forms/uploads/php/files/94232b5ca2d83f6463ea341c9047e993/guzilabadesolesebosolelub.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_off0000ea1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA1C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001022e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1022E 17360 bytes
SHA-256: 698d2e60d48d86002e1de3ee6ec13fc2d4d53d4a51a2b048e377d4c9a7136ced
font_02_sfnt_off00012f67.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F67 11020 bytes
SHA-256: fad53440982285ac2e18d557277bfa8628adb82824dbd803bca26ff9d7bd8c25

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