Malicious PDF — malware analysis report

Static analysis result for SHA-256 a7f8f4d729dd4a70…

MALICIOUS

PDF

91.6 KB Created: 2021-09-01 08:36:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 5f4124afe83d42694a3ae2028596c107 SHA-1: 07cd831b0e932dc933f6da1024f2d79cc6704282 SHA-256: a7f8f4d729dd4a70287ee7e41a43126c1cb90776eae306946430649580d6710d
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 malicious, including a critical ClamAV detection and an ML classifier. It contains a link farm pointing to multiple compromised WordPress upload directories, suggesting an attempt to distribute malicious content or phish users. The document body is heavily obfuscated and unreadable, providing no direct clues to its purpose beyond the presence of external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://kazenergy.kz/wp-content/plugins/formcraft/file-upload/server/content/files/16077c83b0d683---bulujopivelu.pdf
    • https://gw21.ch/uploads/userfiles/file/pukiv.pdf
    • http://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd99b67276f---fokowebofitekenu.pdf
    • http://europeanprofservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160748c0fc28cb---17968841085.pdf
    • http://steelbo.com/uploads/admins/u0/files/20210530054439.pdf
    • https://www.bouwenaaneensterkwerkgeversmerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160f3979dd61c4---81335313233.pdf
    • https://bf-pomosch.ru/wp-content/plugins/super-forms/uploads/php/files/0cga7dunjs3m2cb5cmnk6i5bk4/26534852661.pdf
    • https://connect.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/ba1bc0f6cde020cac8b14b0c065eb991/fosinuzig.pdf
    • http://maytinhtuyenquang.com/home/maytinhtuy/domains/maytinhtuyenquang.com/public_html/images/file/zobederuwodedagitij.pdf
    • http://huntland.hu/upload/file/73645582606.pdf
    • http://liubeauty.com/luutru/files/15164346064.pdf
    • https://klairtransport.com/uploads/files/30239970203.pdf
    • https://camile.vn/wp-content/plugins/super-forms/uploads/php/files/qfmfaubu33tsaf4k22qcpaubl0/3693086209.pdf
    • https://xn--80adj7cxa.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/90ed91ff2803dfb3f3258a3f6990e59d/ropejafodekobebozobomu.pdf
    • http://naasschoolofmotoring.ie/fckeditor/userfiles/file/24806213552.pdf
    • https://avis-medical.ma/wp-content/plugins/super-forms/uploads/php/files/f8750359344048ba127d63ea52a1322b/62643271403.pdf
    • http://sciencevier.com/wp-content/plugins/formcraft/file-upload/server/content/files/160958ece6e501---gikawinajub.pdf
    • https://veglifekc.org/wp-content/plugins/super-forms/uploads/php/files//84693372060.pdf
    • http://dharmapremipariwar.org/userfiles/file/27901111611.pdf
    • https://archcosmeticstudio.com.au/wp-content/plugins/super-forms/uploads/php/files/d82b44e00757015e432a6da35d4c6e5b/pedolejetuxiwito.pdf
    • http://xn----7sbbgprpk7biiq.xn--p1ai/admin/ckfinder/userfiles/files/40911855021.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=literary+devices+in+romeo+and+juliet+act+5+scene+3
    • 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_off0001002f.bin
310694e131d8cfd08fc5f11f5c966a5860adbb867e49626b2fb5a582ce81b690
pdf-font-stream PDF embedded font (sfnt) at offset 0x1002F 11204 bytes
font_01_sfnt_off00011a6a.bin
c051684c6280f4a3be36a7bcc11994ca7d923a39772c2404b1eae6fe51856908
pdf-font-stream PDF embedded font (sfnt) at offset 0x11A6A 17656 bytes
font_02_sfnt_off0001477b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1477B 16792 bytes