Malicious PDF — malware analysis report

Static analysis result for SHA-256 d45e4b21fc271425…

MALICIOUS

PDF

65.1 KB Created: 2021-08-14 10:17:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: f4ebce10a1578219ad10b2a37152a0c8 SHA-1: 78b06ab186833100b259f47491f05c9cfdd25da7 SHA-256: d45e4b21fc271425ed5431c25bd4d86b27963df24d0ab3cda5f246cd72e2164b
154 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to numerous compromised WordPress sites and other disposable hosting, indicating a phishing or malware distribution campaign. The ClamAV detection and ML classifier strongly suggest malicious intent. While no scripts were extracted, the structure and URL patterns are consistent with a malicious document designed to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7964

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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
  • 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://www.aluvascientific.com/UserFiles/file/42599426968.pdf
    • https://too.kg/wp-content/plugins/super-forms/uploads/php/files/8fa9a1fe614690aebb7969b91ababa56/sumufuroti.pdf
    • https://www.litesourcenc.com/wp-content/plugins/super-forms/uploads/php/files/b518573bbcd31a06d6111ff25d2154f6/kogofidezitim.pdf
    • http://isemya.by/modules/ariol/static/ariol/ckfinder/files/guvetovusadugegavadabaz.pdf
    • http://ovodatar.hu/userfiles/file/gisemogezujaripa.pdf
    • http://canoto.us/Images_upload/files/rawimezetalukil.pdf
    • http://maginsaatmetal.com/resimlerfiles/70260890216.pdf
    • http://tavernadelsnoguers.com/wp-content/plugins/super-forms/uploads/php/files/0ebf21b5a85fd5f192b0e6c1f3380fd0/45879213075.pdf
    • https://laxmigrouppune.com/wp-content/plugins/super-forms/uploads/php/files/a0462e97de121a7711d33c37fd34991f/76330638884.pdf
    • http://ahxxzx.com/userfiles/202106/file/nodozulijeladu.pdf
    • http://vienkiemis.lt/app/webroot/uploads/userfiles/files/6929625500.pdf
    • https://luxmarketing.agency/wp-content/plugins/super-forms/uploads/php/files/2u6setntc7t0oadsnvrn4vkmgt/wiwukepitenewi.pdf
    • http://zonweringbelgie.com/ckfinder/userfiles/files/33247587667.pdf
    • https://tecsal.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160bc50b452107---zepiderutuso.pdf
    • http://www.halpellet.hu/userfiles/files/17401687449.pdf
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/c45090e1c0751b686d7732493f80c512/vonikupud.pdf
    • https://dhesient.com/media/72710982079.pdf
    • https://amesmedicalservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608509bfa33c3---zokakobunor.pdf
    • http://stlnsk.ru/uploads/file/babunazaponevulosuzedo.pdf
    • https://mmszke.hu/files/file/xipolalili.pdf
    • http://davidhammerstein.org/userfiles/file/63005717847.pdf
    • https://eliteplacementagency.com/uploads/files/vewujebowuzobemogamatixim.pdf
    • http://www.akutrans.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089fb857411e---92750081393.pdf
    • http://www.julitolaschools.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3d5f3c8375---sosodusitedusex.pdf
    • http://boulderdivorcelaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c8bdc0345f---8939303331.pdf
    • https://noks.cz/wp-content/plugins/formcraft/file-upload/server/content/files/16098950e2a5c0---24129658976.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=automotive+electricity+and+electronics+6th+edition
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ec70.bin
c8746b63200438156f11653a8015b50bcfce8eecdcf2a039bbb978714036b0ae		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEC70 11064 bytes

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