Malicious PDF — malware analysis report

Static analysis result for SHA-256 438d77e91a73cfa3…

MALICIOUS

PDF

94.0 KB Created: 2021-06-29 00:12:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 969f8c85877c7b30cf8766fd3a517d5f SHA-1: eb1c5f40afb6ed8dd5ffc2fbe22a06e54179e9a1 SHA-256: 438d77e91a73cfa3bee6631dfaaa943512cc4a3233bd75dbc10135f7cdfad809
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised WordPress sites and other domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The document body is heavily obfuscated and does not provide direct user-facing content, but the presence of multiple external URIs and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic confirm the link-farming attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9937

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 https://laborke.ru/uplcv?utm_term=cross+sectional+area+of+cuboid
    • http://www.marsagri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b41c7dd8cd3---tijubonigekipamamo.pdf
    • https://rts-wm.com/ckfinder/userfiles/files/45644319157.pdf
    • http://busankid.com/webfiles/board/file///91960782756.pdf
    • https://thaiwoodengames.com/files/upload/files/89973341127.pdf
    • https://burstallconrad.com/editor_files/file/fofubunalawuvexapi.pdf
    • https://livredart.com/ckfinder/userfiles/files/60859302317.pdf
    • http://www.maarsehoveniers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608118d2d1fc5---jupotivikoforag.pdf
    • http://vdgairconditioning.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1606cbd3fd3116---6801887490.pdf
    • https://grand-forge.ru/wp-content/plugins/super-forms/uploads/php/files/7c3ab4eeaa7f8ad8324cd55de5884174/vulupow.pdf
    • https://tramhuonghanoi.vn/upload/files/fuwileruxagixikuledek.pdf
    • https://www.heracles-hotel.eu/wp-content/plugins/super-forms/uploads/php/files/gtl7hf83jla34hgn3v0lu5j956/namunususukonirokuf.pdf
    • http://sentezetutmerkezi.com/upload/ckfinder/files/pofitarebuxafe.pdf
    • http://baschin-heizung.com/meineBilderAlbertGrundschule/file/52753086806.pdf
    • https://diversifiedhumansolutions.com/wp-content/plugins/super-forms/uploads/php/files/f900a730789b04f2428689f50f08ce64/95359651506.pdf
    • http://rusiuojigalvoji.lt/wp-content/plugins/formcraft/file-upload/server/content/files/160a18a3ca422b---13391696534.pdf
    • http://www.publicitymailing.ie/wp-content/plugins/formcraft/file-upload/server/content/files/1608d4762ba94a---xomawolifitaw.pdf
    • https://www.landalastadservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080758a8add1---fegarovevokubabemu.pdf
    • http://grupogmec.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f4e8dd9ad7---92607761618.pdf
    • https://unique.global/wp-content/plugins/super-forms/uploads/php/files/a565458c5986b6458748749ab7133f99/rexapafinulufirimiv.pdf
    • http://theydeserveastamp.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607592709679e---9664182269.pdf
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/18r9ig63rdbj1l4tv49kd3ce84/bomitodosodokaga.pdf
    • http://aisef.org/uploads/userfiles/file/file/texojigomovovewarebo.pdf
    • https://floorco.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/a733dad28abfdae593940092918953d7/36772102406.pdf
    • http://englandmatchshirts.com/assets/file/dunadenigonilovoxijupu.pdf
    • https://sk-developers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607956f4cb03b---latipolexax.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010b1c.bin
f7172184561ae10a0e811340d7e0a30c9ce39101a3d4697b37d5a35b8c7f40eb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10B1C 10740 bytes
font_01_sfnt_off000123e5.bin
f4eae6a1e9c6065d0ff4e6a8e09e91a6996bdb924599d4f94baa606b10d705f7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x123E5 18164 bytes
font_02_sfnt_off000152ac.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x152AC 16792 bytes

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