Malicious PDF — malware analysis report

Static analysis result for SHA-256 afc47a2491a7d341…

MALICIOUS

PDF

70.7 KB Created: 2021-09-19 04:44:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: 621bdaa04c4b63248b4734cc347ced19 SHA-1: c8c8a991963de5d7c10ab889134205852df36103 SHA-256: afc47a2491a7d3417967550ea07cddbd52f4b33e5db4429d51c3449caf93ff9b
162 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as a malicious PDF by ClamAV and an ML classifier, indicating phishing and trojan characteristics. It contains embedded JavaScript and a link farm pointing to compromised CMS upload storage and disposable hosting, likely intended to redirect users to malicious websites. The primary attack pattern involves luring users to phishing sites via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6614

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.
  • 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://laborke.ru/uplcv?utm_term=how+to+convert+mp4+to+mp3+in+vlc PDF link annotation
    • http://alarcon-v.com/editor_upload_image/file/19467767507.pdfIn PDF document text
    • https://inprovitcentroamerica.com/ckfinder/userfiles/files/kusimemogekur.pdfIn PDF document text
    • http://pi-consulting.ch/download/kokozenitunujunenukux.pdfIn PDF document text
    • https://sklepbonus.pl/userfiles/file/gujosigotopakelinakilul.pdfIn PDF document text
    • http://edumedcare.pl/upload/files/feloxiju.pdfIn PDF document text
    • https://montpellier-business-plan.com/mbp/upload/images/images/upload/ckfinder/finokuputosetizoj.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/161322d8ceb603---zupepetagowanulekelila.pdfIn PDF document text
    • https://nationalshield-uae.com/userfiles/files/48722049267.pdfIn PDF document text
    • https://shiokuda2.com/contents/files/zaridowisepovetegadunu.pdfIn PDF document text
    • http://suliaok.com/v15/Upload/file/20219121651241690.pdfIn PDF document text
    • http://www.giuseppe.ru/ckfinder/userfiles/files/59814791673.pdfIn PDF document text
    • http://recruiters-zone.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d1a7554d75---mogipudosabejoretamamikar.pdfIn PDF document text
    • http://bojovesporty.cz/userfiles/file/7813649702.pdfIn PDF document text
    • http://opsir.eu/files/file/33700927093.pdfIn PDF document text
    • https://xn--1--8kcai1ck2bs.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/d8a0fd16541334206e7d9fda2b91f5b9/25824846326.pdfIn PDF document text
    • https://habibitours.org/ckfinder/userfiles/files/pazukufeluwuzosi.pdfIn PDF document text
    • https://eurotig.ro/file/23461348049.pdfIn PDF document text
    • http://nfc.soo.jp/file/40593784368.pdfIn PDF document text
    • http://hokkaido-love87.com/app/webroot/js/ckfinder/userfiles/files/24472670038.pdfIn PDF document text
    • http://thewesternmist.com/userfiles/file/72549931988.pdfIn PDF document text
    • https://kirmatas.com/userfiles/file/82030315841.pdfIn PDF document text
    • http://fgosvo.ru/files/files/wosifokoladuge.pdfIn PDF document text
    • https://medicentrumnz.eu/medicentrum/files/file/34525075496.pdfIn PDF document text
    • http://sushinamu.com/uploads/files/radagejugobazuraxelefi.pdfIn PDF document text
    • http://premiumcsp.com/uploads/files/buvetinazunozebiruvemefe.pdfIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eea7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEA7 17912 bytes
SHA-256: 1d6d1533b82e8a18ff0006c3b6c95211e24c444339f03dc464766823af6b5a69

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