Malicious PDF — malware analysis report

Static analysis result for SHA-256 f45e22de518b8888…

MALICIOUS

PDF

73.4 KB Created: 2021-06-18 17:14:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: afa28c3bfcf785c00618870aab18ae1e SHA-1: 98edca1c297693f5fe7871d252fd94abb793f277 SHA-256: f45e22de518b88885654320aed105717f432b69af69276c953f7d2e2007fbdb2
154 Risk Score

Malware Insights

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

The PDF was flagged by multiple heuristics as containing a link farm hosted on compromised WordPress sites, indicating a phishing or redirection attempt. The ML classifier and ClamAV detection further support its malicious nature. No scripts were extracted, and the document body was heavily obfuscated, but the presence of numerous links to potentially malicious or compromised domains is a strong indicator of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9617

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.nanodrywash.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f3e82153fa---28826364669.pdf In PDF document text
    • https://hpx.com.ua/wp-content/plugins/super-forms/uploads/php/files/9337e41353493e38afb0cec65edda804/41381807321.pdfIn PDF document text
    • https://ev-owners.jp/userfiles//files/lezusifupebubabuni.pdfIn PDF document text
    • http://admio.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607f814ab5e4c---27796985130.pdfIn PDF document text
    • http://kazenergy.kz/wp-content/plugins/formcraft/file-upload/server/content/files/160bda561134a6---toxudogufivixedativilo.pdfIn PDF document text
    • http://lichnyiybrand.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607ab7c1e7589---60765875815.pdfIn PDF document text
    • http://beerskiboot.com/img/upload/file/13352520254.pdfIn PDF document text
    • https://parisautotravel.com/wp-content/plugins/super-forms/uploads/php/files/lk1e7rl35vuu5sakkf3jhjku53/36890542208.pdfIn PDF document text
    • https://www.beadvised.co.uk/wp-content/plugins/super-forms/uploads/php/files/bfbe08fa6ea74d54fbc2a56972f554c6/80130882404.pdfIn PDF document text
    • https://www.mercato.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160886a299b2a5---94315762182.pdfIn PDF document text
    • http://bularz-auto.pl/images/userfiles/file/povikubolagadora.pdfIn PDF document text
    • http://recamonde.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606f89bb5acce---68271562448.pdfIn PDF document text
    • http://akcjonariusz.com/UserFiles/file/18450866834.pdfIn PDF document text
    • http://saovietgroup.com/upload/FCK/file/nipoxadibubidaxovuzalotu.pdfIn PDF document text
    • https://adsbudget.net/userfiles/file/79054471212.pdfIn PDF document text
    • https://www.wikiwebagency.it/wp-content/plugins/super-forms/uploads/php/files/8456ec08f4f50eccb196397e63e96d67/99415693061.pdfIn PDF document text
    • https://www.scilights.com/wp-content/plugins/super-forms/uploads/php/files/606b01ba90572e1b35a5211900168506/gokusevuvovijumimadu.pdfIn PDF document text
    • https://smilepath.com.au/wp-content/plugins/super-forms/uploads/php/files/71e9a0222d0e2cbef8438ab9d222751b/64865991728.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=la+gloria+de+dios+ricardo+montaner+mp3PDF link annotation
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e980.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE980 5500 bytes
SHA-256: 1e908b0e57aa7a1ad19c500519649c4ec7622f11d895b2914111758875771f04
font_01_sfnt_off0000fc25.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC25 13280 bytes
SHA-256: 2e5bdf61f311cd9ded4085384b538abb334374149d6f29f5c06b4e3bc84a53ef

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