Malicious PDF — malware analysis report

Static analysis result for SHA-256 40266ca4220f1d9c…

MALICIOUS

PDF

86.2 KB Created: 2021-06-30 09:44:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: c66d53d88b83654bd3046b124aade9b2 SHA-1: 4f3207676c644ee0a2e4d24f8fcbe6548114fe97 SHA-256: 40266ca4220f1d9ca7def0c6270d556b1fbf34a2831ecd0b384af4f520166f3a
156 Risk Score

Malware Insights

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

The PDF document contains numerous embedded URLs that form a link farm, directing users to various compromised websites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of multiple distinct hosts and the use of compromised CMS upload storage suggest an effort to obscure the ultimate destination and evade detection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://medvor.ru/uplcv?utm_term=age+limit+for+dating+in+new+mexico PDF link annotation
    • http://www.theagentpipeline.com/wp-content/plugins/formcraft/file-upload/server/content/files/160af7b2a6390c---63154196234.pdfIn PDF document text
    • https://webhostmurah.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084236cc538b---11274064411.pdfIn PDF document text
    • http://nuraski.pl/wsg/userfiles/vazasoxotese.pdfIn PDF document text
    • https://maydongy.com/wp-content/plugins/super-forms/uploads/php/files/acsarpbjil8ku4upnt8e5c0do1/rerotiku.pdfIn PDF document text
    • http://claudiodauelsberg.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16088908a98365---ninoxisosonidevogodidavin.pdfIn PDF document text
    • https://aquariumfargo.com/wp-content/plugins/super-forms/uploads/php/files/6ad8c1a92d3f7290615962a94588e794/selusanugipolubijuvexu.pdfIn PDF document text
    • http://extreamtuning.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16089a298e1c41---71728414772.pdfIn PDF document text
    • https://performanceltg.com/wp-content/plugins/super-forms/uploads/php/files/2f09f3d75da1c74818b83d78ac27ff99/41136456668.pdfIn PDF document text
    • https://cwlighting.com/wp-content/plugins/super-forms/uploads/php/files/aa26756bbc1d917d90ddb3e8f1c9f3a0/tatagamowelafarese.pdfIn PDF document text
    • https://hightechrustremovers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160bb783c51e9d---74722232397.pdfIn PDF document text
    • http://sip7.online/wp-content/plugins/super-forms/uploads/php/files/333e86eb32dfd9d848d6d0ce79d91160/gobagaseperad.pdfIn PDF document text
    • http://ambvetbrashersclavoghisu.eu/userfiles/files/pusexixezofilukegivojolar.pdfIn PDF document text
    • https://phuketwebstudio.com/ckfinder/userfiles/files/tududonilekagunajuruwejun.pdfIn PDF document text
    • http://wsp.pl/userfiles/file/zudizeputivi.pdfIn PDF document text
    • http://akinmedical.com/uploads/file/dikujutajarur.pdfIn PDF document text
    • https://home18.ru/wp-content/plugins/super-forms/uploads/php/files/290eccd38b6f5fdbc22fa1bd10df41be/burapebasupizariludeke.pdfIn PDF document text
    • https://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/e53769c4ba260cadb23182bb334a0685/davapuwativewibalunoweg.pdfIn PDF document text
    • https://moma-restaurant.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608aeb81e0188---94826396797.pdfIn PDF document text
    • http://boeschfamilytravels.com/clients/43210/File/temovinutozu.pdfIn PDF document text
    • https://dm288.rs/slicice/file/vamutuzikemu.pdfIn PDF document text
    • https://www.goldenplanet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160af1fc9980e7---54371540130.pdfIn PDF document text
    • http://bhk-aindling.com/userfiles/files/5013011963.pdfIn PDF document text
    • http://kwik-it.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160818d0d92644---59095513097.pdfIn PDF document text
    • https://globalclassic.org/wp-content/plugins/super-forms/uploads/php/files/pbphoifs8v9i25tgs0t0ik4ob8/tuwuginosofagirosimodalad.pdfIn PDF document text
    • https://thealloywheelcentre.co.uk/wp-content/plugins/super-forms/uploads/php/files/99b2ccc65f95c6aa6882234ceb180628/29930542778.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_off0000f00f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF00F 10820 bytes
SHA-256: cc8035d322a37c2a251c49c465e7865617c4911b6c52b7d7f9ba3202ed46097d
font_01_sfnt_off000108db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108DB 16548 bytes
SHA-256: 5e5cdbd4ee609ab6e69addfacd91a6dff77018a2ddd2bfe9c07efae8663ed27d
font_02_sfnt_off00013389.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13389 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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