Malicious PDF — malware analysis report

Static analysis result for SHA-256 85f589638698520f…

MALICIOUS

PDF

71.6 KB Created: 2021-09-29 09:03:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 54cdc882684166257900061f84aefc0c SHA-1: c7327dc8a7a336b0a5cd17b8edabd58a86eee6bd SHA-256: 85f589638698520f23de525773749cef55be76c609b9169ec67a26a361ddd360
156 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many hosted on compromised CMS platforms or disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded links are indicative of an attempt to exploit user interaction for malicious purposes.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9837

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://renesens21.com/ressources/upload/files/80341400348.pdf In PDF document text
    • http://www.wcd.com.tw/ezadmin/ckfinder/userfiles/files/19200448585.pdfIn PDF document text
    • https://mymovingestimate.com/wp-content/plugins/super-forms/uploads/php/files/2f61ff3d5f06f9e453a73c087e2e44b3/fujadoragujifibul.pdfIn PDF document text
    • http://mas.vacations/wp-content/plugins/formcraft/file-upload/server/content/files/161476707ee2bb---posipivogotunokuzawis.pdfIn PDF document text
    • https://homeaestheticsllc.com/wp-content/plugins/super-forms/uploads/php/files/a5043853f62c5b1e70dc269ad8c276e4/37540032193.pdfIn PDF document text
    • http://www.taylormadetc.com/siteadmin/ckfinder/userfiles/files/mimurojiragukuluk.pdfIn PDF document text
    • http://sov.tranovice.org/webpagebuilder/ckfinder/userfiles/files/sagupibaxatob.pdfIn PDF document text
    • https://www.revistadefiesta.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a26667a11a---12372339908.pdfIn PDF document text
    • http://rioairporttransfer.com/ckfinder/userfiles/files/7697334348.pdfIn PDF document text
    • http://okuninka-biale.pl/userfiles/file/nupilamatavugijesegoga.pdfIn PDF document text
    • https://cashcruis.ru/wp-content/plugins/super-forms/uploads/php/files/1802f177fc19fadac0104e43ed3354fc/29511711835.pdfIn PDF document text
    • http://studionegrelli.it/userfiles/files/zixasalajuresafe.pdfIn PDF document text
    • https://macleanpinesdrivingschool.com.au/wp-content/plugins/super-forms/uploads/php/files/5ec9b9ef29dce9575c17ee5fb1d0df55/rikamidibulewamodo.pdfIn PDF document text
    • http://gamboeng.com/assets/ckfinder/userfiles/files/tolerogoloxose.pdfIn PDF document text
    • http://walosports.cl/userfiles/file/xapelanemi.pdfIn PDF document text
    • http://ufnk.fr/app/webroot/files/file/35122274872.pdfIn PDF document text
    • http://terremeraude.com/userfiles/file/62009663483.pdfIn PDF document text
    • http://spharma.ua/files/file/mowezutemip.pdfIn PDF document text
    • https://k-newsletter.com/ckupload/files/jiwesafifak.pdfIn PDF document text
    • http://phamtrangia.com/upload/files/18769857343.pdfIn PDF document text
    • http://madiran-cruduparadis.fr/ckfinder/userfiles/files/wanebuxozolenotip.pdfIn PDF document text
    • https://www.hit-education.com/wp-content/plugins/super-forms/uploads/php/files/24pvbi4574hifsslla8fubh5i4/87389673568.pdfIn PDF document text
    • http://asv-solnice.cz/_files/file/jajonamegekawoxexo.pdfIn PDF document text
    • https://bloomlight.pl/_bloom/file/98647512771.pdfIn PDF document text
    • http://ibb-online.ru/f/file/sugasijenupisaki.pdfIn PDF document text
    • https://sadex.pl/fck/file/pezaxosesawafadawoti.pdfIn PDF document text
    • http://kaushalacademy.org/ckfinder/userfiles/files/67153860690.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=klwp+themes+2021PDF link annotation
    • 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_off0000b4e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB4E0 17508 bytes
SHA-256: da2c65e162b7af8e997cf73a06c3885509675def0ab4d0f595321e87f594be32
font_01_sfnt_off0000e159.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE159 10312 bytes
SHA-256: 964014efebdae829facc6ac2ea6dab1f5ecb50885e3def9f011623f25a54ff16
font_02_sfnt_off0000f8cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8CC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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