Malicious PDF — malware analysis report

Static analysis result for SHA-256 f818dd460d08edd7…

MALICIOUS

PDF

87.1 KB Created: 2021-09-18 01:36:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 4b762c2956e65c2c6b434bdb4b8af29f SHA-1: 814a59169e2b130d45e77d44783d623e1af48f87 SHA-256: f818dd460d08edd7cdaf6c5673f28048709f3dae1b80366d1d2781c9f694f581
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier indicating a high probability of maliciousness. The document contains numerous external URIs and link farm patterns, suggesting it is designed to redirect users to potentially harmful websites. The presence of compromised CMS upload links further indicates a malicious intent to host or distribute further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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=the+legacy+virginia+woolf+pdf PDF link annotation
    • https://dienmayminhchau.vn/uploads/news_file/vutomavulijogefopalibi.pdfIn PDF document text
    • http://ip-malkov.ru/uploads/files/laboxajopozapizavu.pdfIn PDF document text
    • https://palet-school.com/files/files/70977824832.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/6fb1cdded630363538fd2e35c1c53cb9/jonox.pdfIn PDF document text
    • https://mattweidnerlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c1020a6809---91637180529.pdfIn PDF document text
    • https://mdteam.se/ckfinder/userfiles/files/86772573053.pdfIn PDF document text
    • https://lose-weight.tw/upload/files/4459113722.pdfIn PDF document text
    • https://miet.hu/kepek/24735708196.pdfIn PDF document text
    • http://pes.edu.mn/ckfinder/userfiles/files/24578608698.pdfIn PDF document text
    • http://tvoirostov.ru/ckfinder/userfiles/files/majerosema.pdfIn PDF document text
    • https://www.sahabatkeluargahomecare.com/wp-content/plugins/formcraft/file-upload/server/content/files/16143a42d7086e---77124679707.pdfIn PDF document text
    • http://kuppersbusch.hu/userfiles/files/87808350123.pdfIn PDF document text
    • http://www.ciesol.es/ckfinder/userfiles/files/47463272206.pdfIn PDF document text
    • https://jakspravnenapsa.cz/userfiles/file/mawavaw.pdfIn PDF document text
    • http://antik-cafe-bergen.de/wp-content/plugins/formcraft/file-upload/server/content/files/16137e570b128a---sugud.pdfIn PDF document text
    • http://cosmikkino.ru/sadm_files/20605798659.pdfIn PDF document text
    • http://duocmyphamcongty.com/app/webroot/uploads/files/fonaveluzirose.pdfIn PDF document text
    • http://alrabbancapital.com/file/files/43278632635.pdfIn PDF document text
    • http://aksaaydinlatma.com/img/editor/image/file/vodekevuposalakefelutu.pdfIn PDF document text
    • https://www.dooleysnaturalgas.com/ckfinder/userfiles/files/7952526728.pdfIn PDF document text
    • http://www.anclupnapoli.it/userfiles/file/56116963169.pdfIn PDF document text
    • http://visualpaint.com/wp-content/plugins/formcraft/file-upload/server/content/files/16144e6af52a8f---jawoxabepazudufizolojorel.pdfIn PDF document text
    • http://mimarkamilozkartal.com/userfiles/files/wugujegu.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_off0000f0ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0CA 10860 bytes
SHA-256: 1f944d848f5d6d2e2a41b35dc47005068d0cb0e26ee693734f3a84dda9a6e5cb
font_01_sfnt_off000109a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109A9 17784 bytes
SHA-256: c375f36ae4f129f8a16b9dee4845628129dcab2de4804c6003147cb3c7b9ab22
font_02_sfnt_off000136cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x136CC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1