Malicious PDF — malware analysis report

Static analysis result for SHA-256 4a8d3f8eddda163f…

MALICIOUS

PDF

62.2 KB Created: 2021-06-18 02:59:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 90c46f472eb5ea27874fddc501ea0ceb SHA-1: 209fea5aa1c2f26d56f82874fc081b1d3a157cc8 SHA-256: 4a8d3f8eddda163f129c253cb222edaf3e388dbde494b1a9722113520d4ed9c6
154 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised WordPress sites, specifically within plugin upload directories, indicating a link farm designed to redirect users to malicious content. ClamAV detection as 'Pdf.Phishing.Trojan' and ML classification further support its malicious nature. The primary attack pattern involves luring users through a seemingly innocuous PDF to potentially malicious external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8016

Heuristics 5

  • 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
  • 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://mosoptagro.ru/wp-content/plugins/super-forms/uploads/php/files/61141249c9fa2ae3260300b67fd934aa/12641460976.pdf
    • https://www.advids.co/wp-content/plugins/formcraft/file-upload/server/content/files/160a45791059d3---71603671672.pdf
    • https://schreinerheusi.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607c2436e7609---mowowaxageselugod.pdf
    • https://irisapp.cn/uploadfiles/fckeditor/20210518/file/16213233072288.pdf
    • http://www.thebetterinsurance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b9eb18cf59f---47615024298.pdf
    • http://cbelmira.com/wp-content/plugins/super-forms/uploads/php/files/odjs30kgoce1i5hoophmrl6in1/82654410497.pdf
    • http://www.iamgoingto1996.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088aa5471e21---repujiwuvami.pdf
    • http://www.reroofingbrisbaneqld.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160abd218ebfbb---30338081094.pdf
    • http://modelkyujin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a478a674eb9---fulib.pdf
    • https://pfgmm.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160724e8dbe49c---wozivabole.pdf
    • https://singaporenotarypublic.com/wp-content/plugins/super-forms/uploads/php/files/7cff03c7ba9092bb4af23faf91195ab5/39034507305.pdf
    • https://classconnbio.com/img-jacson/files/20404105628.pdf
    • https://artenika.pl/fck/file/dewovesadosokasipujixeju.pdf
    • https://securitydm.rs/slicice/file/86822344614.pdf
    • http://actionelectric.pt/www/wp-content/plugins/formcraft/file-upload/server/content/files/1606f5b6d81c07---85105528329.pdf
    • https://hacunamatata.ru/wp-content/plugins/super-forms/uploads/php/files/16e2deda87b96972758ec4e73c1aa220/69310207004.pdf
    • https://atlanthealth.com/wp-content/plugins/super-forms/uploads/php/files/b646e07d341bf6aa17ab3aa6c062f292/gamerozog.pdf
    • https://deewo.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c4734b2bc31---39331138823.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=slim+comparative+and+superlative
    • http://scripts.sil.org/OFL

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e5b3.bin
23dfbb251df95e94f9839d79ed06ce0c9bb7932f078aacf047a4c97ce3a275e2		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE5B3 5380 bytes

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