Malicious PDF — malware analysis report

Static analysis result for SHA-256 31e49324e9a98577…

MALICIOUS

PDF

77.0 KB Created: 2021-09-07 20:36:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 6176ac0758876a471fd5ff0631b35a13 SHA-1: 4867733100eca592a224a0e635c3895b7f88e3fa SHA-256: 31e49324e9a9857769cbf8dd4f63461e5e0b70a0bbbaaa7b6c30c3bef6f652e8
154 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to disposable hosting or compromised CMS uploads, suggesting a link farm designed to redirect users to malicious sites. The file's structure and heuristic firings indicate it's intended to lure users into clicking these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.5192

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 http://bennyhigh73.com/clients/3/33/33ce00c6a031cf3b17a3dcf69aaa7594/File/41924947056.pdf In PDF document text
    • http://hoanhaochemical.com/uploads/files/68731607189.pdfIn PDF document text
    • https://fastcomputer.vn/wp-content/plugins/super-forms/uploads/php/files/2392a26c0814d1160e75ef4056e0b807/71705187618.pdfIn PDF document text
    • http://moscowprice.com/content/xuploadimages/file/garanifisuveva.pdfIn PDF document text
    • https://presstone.hu/userfiles/file/tadavimapakosu.pdfIn PDF document text
    • https://asaptransfers.co.uk/wp-content/plugins/super-forms/uploads/php/files/9fadcv6ofb42jfkqk8ot79vrf5/xesuxu.pdfIn PDF document text
    • https://kop-trans.pl/uploads/userfiles/files/64208547264.pdfIn PDF document text
    • https://harshahometutors.com/uniformkontakt/userfiles/image/files/36766455535.pdfIn PDF document text
    • https://inifd.london/uploads/file/vedukutegete.pdfIn PDF document text
    • http://architettobotteonpierpaolostudioabacus.it/userfiles/files/93338023673.pdfIn PDF document text
    • https://www.ideaklinikbursa.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082e010ca63e---15637600698.pdfIn PDF document text
    • http://geoass.eu/userfiles/files/gufadox.pdfIn PDF document text
    • https://lokmangal.co.in/wp-content/plugins/super-forms/uploads/php/files/f45883675ba43c51b21257b99f5063f9/xobedimafamiperasum.pdfIn PDF document text
    • https://www.reflectionuk.com/wp-content/plugins/super-forms/uploads/php/files/q31b9nkkrt4nri7vmqqtgt9epd/64258286655.pdfIn PDF document text
    • http://lab4050.com/upload/editor/file/40558035893.pdfIn PDF document text
    • http://petra-dario.info/upload/datoteke/junumomi.pdfIn PDF document text
    • https://trucraftsmanship.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c09cca0ed60---zufuremirek.pdfIn PDF document text
    • https://luminex.pl/upload/file/66332093626.pdfIn PDF document text
    • http://chanakyaaerospacedefence.com/userfiles/file/likizowexokiwab.pdfIn PDF document text
    • https://rfcorporation.net/wp-content/plugins/super-forms/uploads/php/files/cf5aa31a2df21eb176a37ed2ed2a08d3/90051479790.pdfIn PDF document text
    • http://www.expo-hotel.com/english/wp-content/plugins/formcraft/file-upload/server/content/files/160d82196abba8---22442006298.pdfIn PDF document text
    • http://uspeh-kursk.ru/ckfinder/userfiles/files/42594610841.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=manual+canon+eos+rebel+sl2PDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000df92.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF92 10388 bytes
SHA-256: 9c6c52eb0490426c34ff702aaf5d59f14ac11ca2f7e66b8cfd6449dced313e77
font_01_sfnt_off0000f746.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF746 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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