Malicious PDF — malware analysis report

Static analysis result for SHA-256 f225fed52b6de36b…

MALICIOUS

PDF

76.3 KB Created: 2021-08-28 21:56:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 4fc783bbd236c708cad1804fd26895da SHA-1: 5a149f768dccdbbe4949bf21d5d24f3d8dd14e4a SHA-256: f225fed52b6de36b4ec43fe26437de1da1bbaa8ccad88d5a88aa73165750a69e
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as a link farm, with many URLs pointing to compromised CMS uploads and disposable hosting. The ML classifier and ClamAV also identified it as malicious, specifically a phishing trojan. The document's structure and embedded URLs suggest an attempt to redirect users to malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://besteva.com/upload/files/xesinezidexuzaredizuwon.pdf In PDF document text
    • http://salespate.com/userfiles/file/67369330607.pdfIn PDF document text
    • https://bankubezpieczen.pl/userfiles/file/wurapabalakazegumejemom.pdfIn PDF document text
    • http://fruitvita.com/files/files/wowinunolumoj.pdfIn PDF document text
    • http://kovacsoltvaskerites.hu/images/file/12281215691.pdfIn PDF document text
    • http://au-coeur-du-temps.com/userfiles/file/166654021.pdfIn PDF document text
    • http://tropo-design.com/ckfinder/userfiles/files/vopejumemoxexubowanun.pdfIn PDF document text
    • http://skup-laptopow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f3ba6e29088---popegawunivokinegirama.pdfIn PDF document text
    • http://lbhs1965.com/clients/6/6b/6bdd8f708684a1f547efbf97e1630fe5/File/tegekazoxitu.pdfIn PDF document text
    • http://volareinmongolfiera.it/userfiles/files/93443041544.pdfIn PDF document text
    • https://rffsev.ru/wp-content/plugins/super-forms/uploads/php/files/3f45b7912bb76c4d50f70eae832a8a3a/83533383688.pdfIn PDF document text
    • https://www.audifonosdoshoydos.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8d61673759---zejofipajujabokadoduduv.pdfIn PDF document text
    • http://www.ambredore.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ebb48dd046---49236530367.pdfIn PDF document text
    • https://drisraadentalcenter.com/userfiles/file/relifujetonufe.pdfIn PDF document text
    • https://www.tai.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1607ebd19b3580---mupukewogatujafaki.pdfIn PDF document text
    • http://meruzhankhachatryan.com/app/webroot/files/file/wekumasagorexezokiram.pdfIn PDF document text
    • http://conwaychristian.org/wp-content/plugins/formcraft/file-upload/server/content/files/16094360d54db6---gefilolufaroxateginiw.pdfIn PDF document text
    • http://israel-aliya.com/wp-content/plugins/super-forms/uploads/php/files/464801b87194ee2061097a62415f63ea/mesapuru.pdfIn PDF document text
    • http://www.bewegeninarnhem.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607ee50651a0f---somivizofukegonuz.pdfIn PDF document text
    • https://escaletravel.com/userfiles/files/xurubodeb.pdfIn PDF document text
    • https://refour.eu/wp-content/plugins/super-forms/uploads/php/files/9c83f6e4e0c033f09c74dbf9039949d9/26624418745.pdfIn PDF document text
    • https://mygoaltv.org/ipp/images/uploads/files/pifigojudikerekin.pdfIn PDF document text
    • https://sketchup360.vn/wp-content/plugins/super-forms/uploads/php/files/73136eek1vt0k2p4ba0ge0gq53/tetepenutekajum.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=how+to+lose+weight+and+get+an+hourglass+figurePDF 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_off0000c7a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7A6 16596 bytes
SHA-256: bb2975986f5cf279d245d03f8aa9dd703cf36dccbb703bde71a8f07f33a9ab9e
font_01_sfnt_off0000f259.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF259 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010a70.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A70 10812 bytes
SHA-256: 7a8deab15786dc10f5820488afb0750795428b252222ad57227b6f45d158cbc7

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