Malicious PDF — malware analysis report

Static analysis result for SHA-256 dcb9d9d772e2e7fd…

MALICIOUS

PDF

76.4 KB Created: 2021-09-04 12:45:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: f8a7ec5462c8ace12db1cb82a54f83ea SHA-1: 7f8f87fceb9492ea6e5fd44b2b45f7baf592bf6b SHA-256: dcb9d9d772e2e7fdec2e22a7f7685493c5d4b0bfb468b938bb220c8e94e0127c
156 Risk Score

Malware Insights

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

The file was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. Numerous heuristics point to the PDF acting as a link farm, directing users to compromised WordPress sites and other disposable hosting domains. The embedded URLs suggest a phishing or malware distribution scheme, likely leveraging the PDF as an initial lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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://krisoc.ru/uplcv?utm_term=rubber+plantation+business+plan+pdf PDF link annotation
    • https://castilloexterior.org/ckfinder/userfiles/files/nakezurekila.pdfIn PDF document text
    • http://aurastaffing.es/upload/file/tivudin.pdfIn PDF document text
    • http://charivne.info/images/file/wufugoneboximiximaletalap.pdfIn PDF document text
    • http://prodesign31.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160e5ccb4bec23---lonobanowimageri.pdfIn PDF document text
    • https://bk.knu.ac.kr/ckfinder/userfiles/files/48365680460.pdfIn PDF document text
    • https://pet-fashion.ro/mm/file/15671838434.pdfIn PDF document text
    • http://hgbs.de/userfiles/file/gulumowitakuxitex.pdfIn PDF document text
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac95da9c167---47299340404.pdfIn PDF document text
    • https://inprovitecuador.com/ckfinder/userfiles/files/45091026971.pdfIn PDF document text
    • http://multifamilyfoundation.org/clients/3/38/38c33163524538bb895552046de0b362/File/88112980158.pdfIn PDF document text
    • http://diamant-x.sk/UserFiles/file/1047489667.pdfIn PDF document text
    • http://chicagohalo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e965b620e96---rekivubojonokumipu.pdfIn PDF document text
    • https://xn--1--8kcai1ck2bs.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/70afc4226b08561efdec8bc5af3ee052/julokekifuvaguvogazop.pdfIn PDF document text
    • http://galettedesrois.hu/userfiles/file/forevuruwalemigagef.pdfIn PDF document text
    • http://virus-safe-zone.com/ckupload/files/17305741194.pdfIn PDF document text
    • http://rayanchem.com/d/files/pulubumededudof.pdfIn PDF document text
    • http://jamoncup.es/wp-content/plugins/formcraft/file-upload/server/content/files/160a032d19fe32---depazefagupej.pdfIn PDF document text
    • https://www.costaverde.it/wp-content/plugins/formcraft/file-upload/server/content/files/160ada5d2360da---23414626248.pdfIn PDF document text
    • http://www.ezmoving.com/file/6945695408.pdfIn PDF document text
    • http://limpiasol.com/wp-content/plugins/formcraft/file-upload/server/content/files/160acc981e3cb3---munutijixuziwu.pdfIn PDF document text
    • https://gservicepz.com/wp-content/plugins/super-forms/uploads/php/files/9f41f49653377b8c0af7261b87f99044/nojokupijakaduwo.pdfIn PDF document text
    • http://starinviter.com/ckimagefiles/89248666438.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_off0000c74c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC74C 17260 bytes
SHA-256: 2ebfe2bbceab16bbf7c87bc68c1ea6034b928f60ea14286d5417bec614573421
font_01_sfnt_off0000f381.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF381 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010b98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B98 10776 bytes
SHA-256: a8e97596854e24c6c7b1c5a653798dbefaeb3dc0631694297c660f342a3d7324

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