Malicious PDF — malware analysis report

Static analysis result for SHA-256 197dfead2756a6d9…

MALICIOUS

PDF

49.8 KB Created: 2021-08-15 00:03:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 6ecf33325e557ef89668a9f4c5fbdd47 SHA-1: 3628c72a076ca00ad482f3a541b0d413c9d9a8c0 SHA-256: 197dfead2756a6d983eec727c14fb8d17071b52d81a171ce8651b252612d197e
202 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript, which is a common technique for executing malicious code. It also features a link farm pointing to multiple compromised WordPress sites and other disposable hosting, suggesting an attempt to distribute further payloads or conduct phishing. The ClamAV detection and ML classifier further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9592

Heuristics 7

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://allytemp.ru/uplcv?utm_term=game+killer+pro+apk+free+download PDF link annotation
    • https://washlounge.in/ckfinder/userfiles/files/41140079757.pdfIn PDF document text
    • http://bioident.pl/photos_fck/file/vatuxizaretugegaj.pdfIn PDF document text
    • http://www.impactit.in/ckfinder/userfiles/files/zevuvavisuwu.pdfIn PDF document text
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/n1ohik3g93uep2vtm8h9vr4e83/widar.pdfIn PDF document text
    • https://www.couleurs-et-jardin.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160ad6bf41498f---vedexujidavogumalopu.pdfIn PDF document text
    • https://twinslock.com/ckfinder/userfiles/files/44668544664.pdfIn PDF document text
    • http://poliinc.com/upload/files/dipobege.pdfIn PDF document text
    • http://mofrantech.com/userfiles/file/62585939412.pdfIn PDF document text
    • https://ildiko-szepsegszalon.hu/userfiles/file/58570411342.pdfIn PDF document text
    • https://fjordancv.info/wp-content/plugins/super-forms/uploads/php/files/121dea8a800227459c2d09d8557d1b45/30304263153.pdfIn PDF document text
    • http://www.weilandensemble.nl/ckfinder/userfiles/files/bujixukazurusizokofuma.pdfIn PDF document text
    • http://interface-referencement.com/userfiles/file/letiximopiridupusod.pdfIn PDF document text
    • https://www.sussexweddingservices.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160806cfb403e0---xeramuxewo.pdfIn PDF document text
    • http://www.optionassurance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1608adad30dd77---40582461777.pdfIn PDF document text
    • https://wecafephuket.com/wp-content/plugins/super-forms/uploads/php/files/mjm5t1a9tbvu51lj1hpmtmcqoq/tudaratimow.pdfIn PDF document text
    • https://winston-woodward.com/wp-content/plugins/super-forms/uploads/php/files/e0e827adbc49ff48dcca5ba7705bac8f/lazibutuvigizekudodikamuz.pdfIn PDF document text
    • http://braintradingbcn.com/wp-content/plugins/super-forms/uploads/php/files/0a3a2f94a336a492c713105b525528a6/jofinudolorogow.pdfIn PDF document text
    • https://cpc-serbia.org/js//files/jefivodukukaxumosufajalu.pdfIn PDF document text
    • http://botanicgardenscafe.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608845ecb7a3f---63798042503.pdfIn PDF document text
    • https://avonsteel.com/UserFiles/file/92724557834.pdfIn PDF document text
    • http://apexibd.com/uploads/fck_uploads/file/38920977149.pdfIn PDF document text
    • http://www.prieteniitehnicii.ro/documente/file/8305100421.pdfIn PDF document text
    • https://biodent.ro/m4fm_files/m4news/ck-uploads-files/xibonisoxigasigevupit.pdfIn PDF document text
    • http://asid.rw/userfiles/file/riramimugulajivuwapojuz.pdfIn PDF document text

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