Malicious PDF — malware analysis report

Static analysis result for SHA-256 98785988a1a02dbf…

MALICIOUS

PDF

84.2 KB Created: 2021-09-17 06:23:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 37f086a513769fe6dcc9ada29eb69761 SHA-1: cad930de8261998bc624fac183de02e4f3aa90a8 SHA-256: 98785988a1a02dbf474d17a863148e31feb3f772e13ecdd5b623b3a9417b7d10
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by ClamAV and an ML classifier. It contains numerous external links, many pointing to compromised WordPress upload directories, suggesting a link farm or phishing lure. The presence of embedded URLs and the PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicate an attempt to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://garglob.ru/uplcv?utm_term=what+can+you+do+with+heart+of+the+sea+in+minecraft PDF link annotation
    • https://www.hediyevideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/161348ece7e4d5---91419756721.pdfIn PDF document text
    • http://resortcrimea.com/ckfinder/userfiles/files/50751776248.pdfIn PDF document text
    • http://chrisdepanneservices.fr/Sites/cds/files/kapamagen.pdfIn PDF document text
    • http://retrolondontees.com/userfiles/file/78847030530.pdfIn PDF document text
    • http://meetburgerusa.com/uploads/files/tesazirogujakupepa.pdfIn PDF document text
    • https://aakritidigitals.com/userfiles/files/76662307394.pdfIn PDF document text
    • http://cncforginghammer.com/d/files/64072249781.pdfIn PDF document text
    • http://gensugroup.com/upload/files/josikugigip.pdfIn PDF document text
    • https://www.heainc.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141d9316ab16---gizomifilovupiwafuzo.pdfIn PDF document text
    • https://ppkh.net/userfiles/file/14505251075.pdfIn PDF document text
    • https://www.autopsrus.com/ckfinder/userfiles/files/28515018816.pdfIn PDF document text
    • http://noithatdangcap.vn/app/webroot/uploads/files/voramejarawi.pdfIn PDF document text
    • http://penzionnakrizankach.cz/ckfinder/userfiles/files/jekumemuwaguperufazilote.pdfIn PDF document text
    • http://xn--90aoa5aj.xn--p1ai/ckfinder/userfiles/files/sajekibimekukuduv.pdfIn PDF document text
    • http://principessavencanice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612eb7b0f0526---64622028494.pdfIn PDF document text
    • https://www.hagensmarketing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ff454d0f65---posudaralavo.pdfIn PDF document text
    • http://westpakusa.com/phpsites/vertical_living/uploads/file/vugegurafan.pdfIn PDF document text
    • http://elturo.ru/img/upload/files/jijiziwugiwif.pdfIn PDF document text
    • http://www.gametimecatering.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ebce004188---88742000115.pdfIn PDF document text
    • https://petrovsky14.ru/docs/files/11331151786.pdfIn PDF document text
    • http://sportingclubalbinia.eu/userfiles/files/69341454932.pdfIn PDF document text
    • http://yuanjiangchem.com/upload/files/34412664117.pdfIn PDF document text
    • https://nam.it/wp-content/plugins/formcraft/file-upload/server/content/files/16143e9178818c---86351331463.pdfIn PDF document text
    • https://euchebnici.com/img/file/78719099327.pdfIn PDF document text
    • http://accutindustry.com/Upload/files/20210915142701.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_off0000e435.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE435 10988 bytes
SHA-256: fa900eb0884c3591c5c2b6f8c20f931ae5ae29c98bd333ff1e8e1838a8d27472
font_01_sfnt_off0000fdab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDAB 17312 bytes
SHA-256: 225186e4a19b9728d54a1c745724df619d571306b843fecd682b3d6dbb410189
font_02_sfnt_off00012a40.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A40 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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