Malicious PDF — malware analysis report

Static analysis result for SHA-256 d432b95758c8e070…

MALICIOUS

PDF

89.5 KB Created: 2021-06-15 20:21:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-23
MD5: c93250401a640a39619ea1e8423bd299 SHA-1: 09aebeccd46975d6283ac7461b71ab9f34eff20c SHA-256: d432b95758c8e070d3f7c89e0f7d091b3cfd535b2d8ff69a65b9a42f6152c486
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many pointing to compromised WordPress sites or disposable hosting, suggesting it functions as a link farm to distribute malicious content or phish users. The presence of external URI heuristics further supports the attack pattern of redirecting users to potentially harmful external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://pixomot.ru/uplcv?utm_term=fgo+waltz+in+the+moonlight PDF link annotation
    • http://www.caslyn.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1608503c032f84---zumoxidoji.pdfIn PDF document text
    • http://webursitet.org/Files/file/genefa.pdfIn PDF document text
    • http://www.anjhimayath.com/upload/file/ginatepivoponuduzenagur.pdfIn PDF document text
    • http://akicgiyim.com/userfiles/file/sajorezimodadulebexoteza.pdfIn PDF document text
    • https://canadiancontractorservices.com/wp-content/plugins/super-forms/uploads/php/files/8iofkksod0s4lknnvunvqqcvs7/tivovapazir.pdfIn PDF document text
    • https://www.toptalentusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fdf6e2c589---73346498993.pdfIn PDF document text
    • https://flyags.com/editorResources/file/%5C/70810488743.pdfIn PDF document text
    • http://bundoreh.com/fckeditor/files/file/penikavasisidakif.pdfIn PDF document text
    • https://hoffmanowska.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160a4ac668ed1b---vasagidaxenikid.pdfIn PDF document text
    • https://www.phoenixdentalacademy.co.uk/wp-content/plugins/super-forms/uploads/php/files/8205383f8452f902ec49387f11a1d364/jefewufijalujoduzef.pdfIn PDF document text
    • https://retentionstudentexperience.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e807e26048---kujalasos.pdfIn PDF document text
    • https://luxartparquet.com/wp-content/plugins/super-forms/uploads/php/files/6231af0948d6608840eca48938976d16/5061765082.pdfIn PDF document text
    • https://kassa-evotor.ru/wp-content/plugins/super-forms/uploads/php/files/kue0nbhcheflq6u668p4120iso/98221620508.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a14a4bed2cd---kefaxikunenarivejalikifit.pdfIn PDF document text
    • http://cohn-vossen.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b85b6d7ed0f---13139218113.pdfIn PDF document text
    • https://sportli.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1607f6cda50b88---raxugigatamapalobuz.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ef5c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF5C 6812 bytes
SHA-256: bb6cdc7cac62052d1fd8637a6a3a0d6b28eda0d815d748b84418a134e78f9b9b
font_01_sfnt_off00010627.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10627 4920 bytes
SHA-256: 72ec9f3b48e287e7450b9eb6f161d6a2e89e21c8cb6205a6b9777257fb877499
font_02_sfnt_off000116df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116DF 11064 bytes
SHA-256: 0824f2f2a91ab6e1d1c2c363de3c6049cf914c09c6e49c69f37530afaa63d08f
font_03_sfnt_off00013cc4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13CC4 18060 bytes
SHA-256: 07a0562ce09a9550dc1dc46b809a30b398f76a0429f977d3f5a0dc06ed561e90

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