Malicious PDF — malware analysis report

Static analysis result for SHA-256 b8da32a6eb353ff5…

MALICIOUS

PDF

85.9 KB Created: 2021-08-16 07:42:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 39e58d6475f090f967b55df744de439e SHA-1: e1966cc1c07927f7749cf206c864e13960754c3e SHA-256: b8da32a6eb353ff5dfeffab30c6bb866aa4b8e3f915fca797348049e92c3a74c
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. The document body is heavily obfuscated and unreadable, providing no direct content clues.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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 http://secretinvitation.net/images/files/55589610301.pdf
    • http://goksirlambinowice.pl/img/upload/files/57188685761.pdf
    • https://www.msolartop.cz/wp-content/plugins/formcraft/file-upload/server/content/files/16085ff033b2ef---69461126629.pdf
    • http://klimagra.pl/images/wysiwyg_img/file/figobuvoroposuzugosinuz.pdf
    • http://careerhack.net/wp-content/plugins/formcraft/file-upload/server/content/files/1608a14190c7a6---kadowipubosigenoji.pdf
    • http://bayernglobal.de/userVZ//file/rogat.pdf
    • http://richfield1962.com/clients/4/47/47516dc9824f3897220912ef171c404f/File/46605844863.pdf
    • https://simovi.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1609cc7f259851---melevawinukutupaj.pdf
    • https://appvid.eus/userfiles/files/1318438190.pdf
    • https://dongytueduc.com/wp-content/plugins/super-forms/uploads/php/files/ji20u2a7ghhg1pufg33qe1t7lc/36814316750.pdf
    • http://roocenter.ru/upload/file/59234255067.pdf
    • https://mobilieroccasion.fr/uploads/file/43065495517.pdf
    • https://aviseco.ro/userfiles/file/punedapapixisifix.pdf
    • https://dedywiredja.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc0046e2578---nofejos.pdf
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/o8dgnatp64io4t2u72j0e7a3j9/jezexuroliwisefa.pdf
    • https://www.landalastadservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ce0749eba53---19335855202.pdf
    • https://malimbe.africa/wp-content/plugins/super-forms/uploads/php/files/e73501ebc78166c80c22d2b2482f51b4/88237901051.pdf
    • http://pphu-joanna.pl/fckpliki/file/kirubuwagesuwiwiniza.pdf
    • https://deedpoll.sg/wp-content/plugins/super-forms/uploads/php/files/462947130427940e34fad41f99a5185e/21587215291.pdf
    • http://www.retorika-zidar.si/ckfinder/ckeditor_uploaded_files/files/xikeravorozuna.pdf
    • https://noble-worldwide.com/wp-content/plugins/super-forms/uploads/php/files/ecfa96804653f958a7d3fc7da5236c63/71794012778.pdf
    • http://nomaquito-travel.com/editor-images/89948111800.pdf
    • http://www.ciesol.es/ckfinder/userfiles/files/kogabawodupepilenibo.pdf
    • https://glosunspa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e586499743e---guwibivej.pdf
    • http://obras.ru/sites/default/files/uploads/53079617289.pdf
    • https://namastehealth.in/wp-content/plugins/super-forms/uploads/php/files/ucbja3fnp01erkd66b6360s5mb/38208537477.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=volvo+v70+2005+owners+manual+pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eb5f.bin
fc35dbad2fc3e67f380557d4a129f4637d18ede4e2f213964eaec55a8aa69fcc
pdf-font-stream PDF embedded font (sfnt) at offset 0xEB5F 17308 bytes
font_01_sfnt_off0001179a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1179A 16792 bytes
font_02_sfnt_off00012fb1.bin
e2ee865cdb8cd1154643a741de55880798ad1b03c4b680277076751e3b75b7e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12FB1 11116 bytes