Malicious PDF — malware analysis report

Static analysis result for SHA-256 af9589923d26d937…

MALICIOUS

PDF

81.0 KB Created: 2021-09-02 02:19:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 19478b0a1123d0ef67004e4e9ee82a63 SHA-1: 86160a5ba0c43a4213d00d07be18e22d64153589 SHA-256: af9589923d26d93782a99e2d7a94d71e3471c0d453bfa224fecde2eef25dfd14
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file is identified as malicious by ML classifiers and ClamAV, indicating it's likely a phishing or trojan distribution vehicle. The document functions as a link farm, presenting numerous URLs that lead to compromised CMS upload storage or disposable hosting, suggesting an attempt to redirect users to malicious content. While no scripts were explicitly extracted, the PDF structure and embedded links are indicative of a phishing or malware distribution attempt, likely delivered via spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://www.roosprommenschenckelfoundation.nl/ckfinder/files/files/verug.pdf In PDF document text
    • https://jaunimodienos.lt/wp-content/plugins/super-forms/uploads/php/files/eomcrptcbtmkoa7d01njspsur1/vivatufedigikuruf.pdfIn PDF document text
    • http://batiment-tunisie.com/userfiles/file/71518667130.pdfIn PDF document text
    • http://www.idenet.net/wp-content/plugins/formcraft/file-upload/server/content/files/160bbfa22be7d9---72604096680.pdfIn PDF document text
    • https://europeancustomtailor.com/wp-content/plugins/super-forms/uploads/php/files/1febe989fc840c6e027dc6ce531472b8/25349408692.pdfIn PDF document text
    • https://senzedigicraft.com/wp-content/plugins/super-forms/uploads/php/files/e45ca23434adde69425e83e1c58d1904/mizilex.pdfIn PDF document text
    • https://conexus-study-abroad-travel.com/ckfinder/userfiles/file/23649495290.pdfIn PDF document text
    • https://weddingitaly.jp/images/file/ruzejalupepalebikasefowok.pdfIn PDF document text
    • http://jcon-aps.dk/userfiles/file/84653303267.pdfIn PDF document text
    • http://escolacaritas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a830432094c---niwowazububumesekumonuduv.pdfIn PDF document text
    • http://heatherjansch.com/ckfinder/userfiles/files/xavuxozebojifutesuwerino.pdfIn PDF document text
    • https://amitadevnani.com/userfiles/file/94205641296.pdfIn PDF document text
    • http://ne-moloko.ee/wp-content/plugins/super-forms/uploads/php/files/fb565aa57283ed263e28d6e428a136ff/pokojugak.pdfIn PDF document text
    • https://hoovermaids.com/wp-content/plugins/super-forms/uploads/php/files/41aed388ad1634366161b4a2c5b20bdb/51809182587.pdfIn PDF document text
    • https://sketchup360.vn/wp-content/plugins/super-forms/uploads/php/files/5hrc3e1e71977pqusm4sjcl3bt/seporepari.pdfIn PDF document text
    • https://tattica.byespresso.com/app/webroot/files/upload/files/xomidet.pdfIn PDF document text
    • https://centrobrands.com/wp-content/plugins/super-forms/uploads/php/files/5e456d4e20a4034cfc2c4e96ea0478cf/lefifolazadisadakuro.pdfIn PDF document text
    • https://www.travelticket.com.au/wp-content/plugins/super-forms/uploads/php/files/ck7ksg86mg7oioamd78ef6405e/fezexijatologanatoxaso.pdfIn PDF document text
    • https://minegociomiweb.com/userfiles/file/xivabefepofikidiragifizo.pdfIn PDF document text
    • https://divinenine.net/userfiles/file/62055118447.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=is+it+bad+for+newborns+to+have+hiccupsPDF 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_off0000d800.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD800 11016 bytes
SHA-256: 718eed9f84a4a542546cccd98cd123824ea57f4bb2c7957fe168a1a3bf918b5f
font_01_sfnt_off0000f16d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF16D 17596 bytes
SHA-256: dfec348c5f82777918ac7428b1d76abb94b3ce4052bd0b6d41cccd55e59db8a5
font_02_sfnt_off00011ea2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EA2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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