Malicious PDF — malware analysis report

Static analysis result for SHA-256 58a73bb2257e734f…

MALICIOUS

PDF

75.6 KB Created: 2021-09-05 07:00:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 67698b7160e53af513596b0d1f4de3d2 SHA-1: e07e883996dbd647784471553637571fd3cc151f SHA-256: 58a73bb2257e734fb6afd26753b6cbdcebd663617b5358393f09402da06656f8
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, presenting numerous URLs that point to compromised or disposable hosting, likely to lure users into downloading further malware or engaging in phishing activities. The presence of multiple PDF link farm heuristics reinforces this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://precisionautoandac.com/wp-content/plugins/super-forms/uploads/php/files/e1e0fd2c529d4811ebbdf2acd55722f0/fatudelamobofumab.pdf
    • http://unionnutritech.com/upload/files/35128229141.pdf
    • http://akkoryazilim.com/userfiles/file/retudajipapigawawubezolov.pdf
    • https://beautyyaurient.com/editor_upload/file/37899605299.pdf
    • http://sh8ke.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a9590eb030---63492434027.pdf
    • http://abwplazaview.com/uploads/files/bimumavoja.pdf
    • http://okwmd.com/upload/fckeditor/file/nufazokulewoxobugapodi.pdf
    • https://www.democratum.com/wp-content/plugins/super-forms/uploads/php/files/dc417f1a4dee20566ba8413dc0b3ecb3/vekimusuvoweguza.pdf
    • https://mailing.crpm.ch/ck/ckfinder/userfiles/files/fazanati.pdf
    • https://popa.com.br/wp-content/plugins/super-forms/uploads/php/files/cea675222f89f000346def512671c13d/vuvofirevigolulok.pdf
    • http://clickvay.com/upload/files/wopaxizojukosakal.pdf
    • http://alemotta.com/resources/original/file/wobipokemunabuwutuxi.pdf
    • https://rlmahtani.com/userfiles/files/nafavowulowufulituz.pdf
    • http://ingenermarket.ru/userfiles/nowijowafiretupu.pdf
    • http://importfoodfair.com/userfiles/image/2021/08/file/31476719375.pdf
    • http://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c7b896a183f---xodilesovutaz.pdf
    • http://asiavent.com/UserFiles/file///48085237581.pdf
    • https://queensflower.nl/clientfiles/11577617553.pdf
    • http://moderncarrent.com/user_img/files/gigoja.pdf
    • http://askaudit.ru/price/sanowosawazudov.pdf
    • https://tucarrorentacar.co/ckfinder/userfiles/files/86116919295.pdf
    • http://claudiodauelsberg.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16088fd8051e78---194196745.pdf
    • http://erainbowrealty.com/userfiles/file/rotado.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=latin+lambada+line+dance+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_off0000c44e.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xC44E 16792 bytes
font_01_sfnt_off0000dc65.bin
2670aa71fd7dc625564d4557bc65333e5b86aca65902ccae492ff23862b0404a
pdf-font-stream PDF embedded font (sfnt) at offset 0xDC65 10488 bytes
font_02_sfnt_off0000f3e9.bin
4fc349d014daf416a357d4f965a57fa0d9f19cc5e831e735bc6e2e06057f72e7
pdf-font-stream PDF embedded font (sfnt) at offset 0xF3E9 17400 bytes