Malicious PDF — malware analysis report

Static analysis result for SHA-256 bd46533e9c412b64…

MALICIOUS

PDF

92.0 KB Created: 2021-09-07 13:36:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 25b2ffa9a5675c884dc3e8eb1a41af60 SHA-1: 0996908b2dd05bd89777007de5ae72cf35bf2920 SHA-256: bd46533e9c412b64de9015447e7b88a9354450298ef1b517ef11c12474027b35
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites. The 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' heuristics indicate a deliberate attempt to create a link farm on potentially malicious or compromised hosting. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://pistant.ru/uplcv?utm_term=1000+most+commonly+misspelled+words+pdf PDF link annotation
    • http://midiabyz.com/wp-content/plugins/super-forms/uploads/php/files/19c906638d7c79d497b30b88db7222d1/69060936568.pdfIn PDF document text
    • https://alshaabcoop.com/userfiles/file/96297611294.pdfIn PDF document text
    • http://vonkoenigsmund.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606cb678b4038---35650684894.pdfIn PDF document text
    • https://traveletrust.com/basefile/traveletrustcom/files/22754001049.pdfIn PDF document text
    • https://baodinhsolar.com/wp-content/plugins/super-forms/uploads/php/files/ldjbdvhcqa599t92lgaj53b8r9/16398877381.pdfIn PDF document text
    • http://jongauger.com/ckfinder/userfiles/files/21150873811.pdfIn PDF document text
    • http://pusancard.com/userData/board/file/susunulixebalafirelem.pdfIn PDF document text
    • https://www.bouldersudbury.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607654de6918b---36304312017.pdfIn PDF document text
    • http://kadh.kr/bobod/upload/file/57125535651.pdfIn PDF document text
    • http://robwalker.net/fckupload/file/34929005920.pdfIn PDF document text
    • http://ty-universe.com/image/files/20210831_005142.pdfIn PDF document text
    • http://iowatriallawyer.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/6328280064.pdfIn PDF document text
    • https://slavica.ru/wp-content/plugins/super-forms/uploads/php/files/1757f09c6b0ee4f5368deeda427ceeb7/zosagepetodudu.pdfIn PDF document text
    • http://belgium-ex.com/images/blog//file/rerinodawawegosefuwoji.pdfIn PDF document text
    • https://cafesca.mx/ckfinder/userfiles/files/wozaferapul.pdfIn PDF document text
    • http://nnk.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160da7fae8f4a9---kakomosularaxazojek.pdfIn PDF document text
    • http://healthywithhart.com/res/file/nukovetinolaros.pdfIn PDF document text
    • https://youstore21.com/wp-content/plugins/super-forms/uploads/php/files/0f5aede3ba43ec1840b6a583259b56c5/tegosokunuguxu.pdfIn PDF document text
    • http://cesnek-vysocina.cz/UserFiles/File/lizapafukeroran.pdfIn PDF document text
    • https://www.straightmyteeth.eu/wp-content/plugins/super-forms/uploads/php/files/baa859f177e9f7a4a697b988cb044f98/kaxufanelaxokivif.pdfIn PDF document text
    • https://kungfuclasshongkong.com/louis/taichi/ckfinder/userfiles/files/80704617175.pdfIn PDF document text
    • https://www.haievent.com/wp-content/plugins/super-forms/uploads/php/files/tdnmnvripksm31luno291aqa9v/jilufog.pdfIn PDF document text
    • https://hightechrustremovers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16071b4dd2b2b9---21190332861.pdfIn PDF document text
    • http://raunlarose.us/wp-content/plugins/formcraft/file-upload/server/content/files/16083b0e3f2f17---daxaxamizu.pdfIn PDF document text
    • http://le383.com/uploads/files/88031204810.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_off0001001c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1001C 18952 bytes
SHA-256: 0d48d0f7c258885d480aebd7afd693977ed0d9894e40932fcacaf64975b6f96a
font_01_sfnt_off000130b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x130B0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000148c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x148C7 10896 bytes
SHA-256: f13ff4b9f6c3b6cc49957c26ab6d5800c82b9ee93a36e91c99a72d7ba23766cc

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