Malicious PDF — malware analysis report

Static analysis result for SHA-256 74c5f1fad4dc8d7a…

MALICIOUS

PDF

77.9 KB Created: 2021-09-03 06:15:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 4a4eefb509b791bf64efe826f4123e51 SHA-1: 21034acd9bb11d9605df221c9e4079acaaf34c11 SHA-256: 74c5f1fad4dc8d7a80cbacd4f650f04286bc5799a793d229593f781767851063
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to disposable hosting or compromised CMS upload directories, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://oniceh.ru/uplcv?utm_term=syllable+examples+list+pdf PDF link annotation
    • http://allmedicus.com/userfiles/file/botisuva.pdfIn PDF document text
    • http://jedzenie365.pl/ckfinder/userfiles/files/punevuselarumime.pdfIn PDF document text
    • https://egyiksem.hu/uploads/file/zejamogetimokojo.pdfIn PDF document text
    • http://mu-rrrc.com/userfiles/file/lovetudil.pdfIn PDF document text
    • http://lapawan15.com/shop/fck_file/file/jidoxivifupukowoxinik.pdfIn PDF document text
    • http://nuyewpilot.academy/wp-content/plugins/super-forms/uploads/php/files/5c184a8b911e27d5ad91a5affdd02a72/28063730527.pdfIn PDF document text
    • http://humanitool.ru/userfiles/file/42053554788.pdfIn PDF document text
    • https://walnutcreekguide.com/wysiwygfiles/file/xukoforujasenoxido.pdfIn PDF document text
    • https://www.davinci.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1610ad6606ac08---12765895109.pdfIn PDF document text
    • http://qca.ch/userfiles/file/burebudunaz.pdfIn PDF document text
    • https://www.spreefahrten-berlin.de/wp-content/plugins/super-forms/uploads/php/files/qe9bs8vdri20hmbhradik9jo2a/lajudinoxumojiguxisad.pdfIn PDF document text
    • https://alarrabnews.com/images/content/content/file/69622790270.pdfIn PDF document text
    • https://everestart.com/images/stories/file/veboxanazuvabasufinazewek.pdfIn PDF document text
    • http://ngocvietbungalow.com/upload/files/wewususave.pdfIn PDF document text
    • https://prtl.pl/userfiles/file/90616633384.pdfIn PDF document text
    • https://advancedbusiness.co/wp-content/plugins/super-forms/uploads/php/files/926241eaf5555ba812170b2a1b472707/98162076833.pdfIn PDF document text
    • http://boek.se/bilder_umeny/File/pifamuwobotiginokomu.pdfIn PDF document text
    • https://mvservice.it/file/xirojubaloxedoniba.pdfIn PDF document text
    • https://mlmrockstars.com/ckfinder/userfiles/files/nisejumunoduf.pdfIn PDF document text
    • https://transmar.biz/ckfinder/userfiles/files/rivijegogebinas.pdfIn PDF document text
    • http://sportgalaktik.sk/userfiles/file/rexoneladatekegazixexisux.pdfIn PDF document text
    • https://voicelux.ru/wp-content/plugins/super-forms/uploads/php/files/f12c8c6a0d187cfbeb3831591c54d76b/94500480606.pdfIn PDF document text
    • https://mytopics.it/uploads/file/lametusoj.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_off0000ccfa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCFA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e511.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE511 10768 bytes
SHA-256: e58a3b138ffd8662f5f1f82c5f8f195c91bb354d241d9c8d5e6669633e0fee7e
font_02_sfnt_off0000fdaa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDAA 17768 bytes
SHA-256: 1bc5ff554d94d2398ff6c7ec7352ee4dc5ae99325b8bd7af724a89b57aa59d30