Malicious PDF — malware analysis report

Static analysis result for SHA-256 a833c673b0ea2673…

MALICIOUS

PDF

82.6 KB Created: 2021-09-02 00:13:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: b4a4c6342d35dbbf731d5e348162460a SHA-1: 4157c6d044a7a39ec72ab4ac21abe519709ca7f2 SHA-256: a833c673b0ea26734a1258cb698137339c54eada8f8d1a5757faa84289263dfa
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or malware distribution intent. It functions as a link farm, with numerous embedded URLs pointing to potentially compromised websites or disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically highlights the non-clustered nature of these links on disposable hosting, suggesting an attempt to obscure the true destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9983

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://mariellatriolo.it/public/file/tukolobojamunosugezap.pdf In PDF document text
    • https://maisonforville.be/documents/file/19872462738.pdfIn PDF document text
    • https://newat.ru/wp-content/plugins/super-forms/uploads/php/files/83a14110dad994c0bc8acbd01c9f2692/46738829410.pdfIn PDF document text
    • http://muzycznescyzoryki.pl/userfiles/file/xaferajirexevofijijabek.pdfIn PDF document text
    • https://codecs.ro/images/file/26324075431.pdfIn PDF document text
    • https://hgindustrial.eu/userfiles/files/matawapedotuxizuneloje.pdfIn PDF document text
    • http://airholic.com/UpFiles/WebEditorFiles/file/51432938048.pdfIn PDF document text
    • http://oneself.pro/wp-content/plugins/formcraft/file-upload/server/content/files/1606d5fa567819---36601345402.pdfIn PDF document text
    • http://mp-hd.de/data/aktualnosci_imgs/file/wetopakulofixixi.pdfIn PDF document text
    • http://vudafrique.com/wp-content/plugins/super-forms/uploads/php/files/980c2ae3826b046b4b850213ab4e5de7/femopakodifetizevenarafi.pdfIn PDF document text
    • http://alwaditrading.com/userfiles/files/wiwamovonupijezabab.pdfIn PDF document text
    • https://www.tvmreza.tv/ckfinder/userfiles/files/56747628019.pdfIn PDF document text
    • http://www.melloecastro.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075a88918333---likekitufifozujugufowisek.pdfIn PDF document text
    • http://topup-fight.com/ckfinder/userfiles/files/daluwebutijaxokudul.pdfIn PDF document text
    • http://www.shipsupply.co.mz/wp-content/plugins/formcraft/file-upload/server/content/files/160735802eed56---jijapuseleveretujimetidax.pdfIn PDF document text
    • https://torgradio.ru/new/files/file/ziduzigulagimaloxigipaj.pdfIn PDF document text
    • https://cooperspick.com/files/17218211824.pdfIn PDF document text
    • http://smartwealthhk.com/userfiles/55065437372.pdfIn PDF document text
    • https://deniz-sogutma.org/img/userfiles/file/vedijezovalovomunitixepaw.pdfIn PDF document text
    • https://him-home.ru/wp-content/plugins/super-forms/uploads/php/files/6c1be961a4021121374856be1daf0917/10157599267.pdfIn PDF document text
    • https://lightsourceindiana.com/wp-content/plugins/super-forms/uploads/php/files/e7c6647be28149bc75a4caf61885f376/90819717001.pdfIn PDF document text
    • http://avandcie-automation.fr/ckfinder/userfiles/files/90103764840.pdfIn PDF document text
    • https://estidevelopers.com/wp-content/plugins/super-forms/uploads/php/files/f63cea90e0a7b081c6b5827eb4d6bbb6/wokatasowapowuniloponaz.pdfIn PDF document text
    • http://stepasidemedical.com/images/uploads/file/5509259574.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=writing+a+cover+letter+for+research+positionPDF link annotation
    • http://kioskcondoweb.wpengine.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f5d64b5286---fofozavenepupowexomotudat.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_off0000dc12.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC12 10820 bytes
SHA-256: 057807a9840de0274815fa55771e5aac68bf86e87a58d70fd7da0d8b82729a16
font_01_sfnt_off0000f507.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF507 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010d19.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D19 17912 bytes
SHA-256: 854a5593a87f5c07be7daa00e43bab4068bc88031d88c153fb9ad710352c8f12

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