Malicious PDF — malware analysis report

Static analysis result for SHA-256 32b5ffb336552be4…

MALICIOUS

PDF

80.9 KB Created: 2021-09-02 20:48:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 30d0567f830b5aa9fd3c2db6fe5ddac2 SHA-1: a8a89543e569f3bea5fa127774d209f0464a8c4d SHA-256: 32b5ffb336552be4d8021584bfdb2ed27d029d776c5d0c04ee4cea05cec09134
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to compromised WordPress sites or disposable domains, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent. The file's structure and the presence of numerous external links align with techniques used for initial access via spearphishing attachments.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • 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://xn----ctbguteehkho5h.xn--p1ai/ckfinder/userfiles/files/41306172623.pdf In PDF document text
    • https://riolospettacoli.it/filesUploads/file/60634735044.pdfIn PDF document text
    • https://szamitogep-szerviz-javitas.hu/ckfinder/userfiles/files/58042752949.pdfIn PDF document text
    • http://aaexpansionjoint.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c61bd78a397---12849969437.pdfIn PDF document text
    • https://hafa-verein.de/wp-content/plugins/super-forms/uploads/php/files/b6e60d690ec929f5309afde6cdd41c02/dawufu.pdfIn PDF document text
    • http://55pluscommunityspecialist.com/userfiles/files/7178859258.pdfIn PDF document text
    • https://www.helpfulhunks.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160fa4c92611f2---93967544891.pdfIn PDF document text
    • http://www.blackhillsdancecentre.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082e7cbc897a---fijafufeluf.pdfIn PDF document text
    • https://fl-forever.com/upfiles/editor/files/61863657724.pdfIn PDF document text
    • https://webupdate.ca/wp-content/plugins/super-forms/uploads/php/files/jtgp898r5d01gp24k46eob4k9t/kijunanez.pdfIn PDF document text
    • https://bulgariapools.com/contents/files/61430056199.pdfIn PDF document text
    • http://aeskulap24h.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b3743427275---wakegu.pdfIn PDF document text
    • https://leavingcare3plus.ch/userfiles/files/44981543884.pdfIn PDF document text
    • http://akcjonariusz.com/UserFiles/file/19415656547.pdfIn PDF document text
    • http://www.zav-mito.si/wp-content/plugins/formcraft/file-upload/server/content/files/160a54c5b81388---lekexozumabopekim.pdfIn PDF document text
    • https://panificioilcavaliere.it/userfiles/files/riwuzexunojupat.pdfIn PDF document text
    • http://oguzlarotomatiksanziman.com/depo/sayfaresim/file/vopetesukirex.pdfIn PDF document text
    • http://www.chatanakonci.cz/userfiles/file/gemetizexowifimav.pdfIn PDF document text
    • http://akcompany.vn/uploads/userfiles/file/33900005638.pdfIn PDF document text
    • https://nscs.org/wp-content/plugins/super-forms/uploads/php/files/56b45d1a51b33079ae0b1cc6075a6eec/4473861525.pdfIn PDF document text
    • https://cosmeticdermatologymiamibeach.com/uploads/data/files/vulewim.pdfIn PDF document text
    • http://bioterapiazabiegi.pl/obrazy/file/vabupovidofutu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=ellen+g+white+writings+pdfPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d649.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD649 10564 bytes
SHA-256: 7569499c9d45c4bf2fdce4697184e28acc4bc7c469938ad09f663cabf302b461
font_01_sfnt_off0000ee13.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE13 18912 bytes
SHA-256: 6985fbb1a6f0e7bd30e7157c31e6bb339314a93f151c8bf749352ade440a14ff
font_02_sfnt_off00011e38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E38 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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