Malicious PDF — malware analysis report

Static analysis result for SHA-256 d1f2b230a4079648…

MALICIOUS

PDF

85.5 KB Created: 2021-06-26 09:49:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 4fb89b8a6af8d94c8e85903374775b0d SHA-1: 0cc8ce7a6f4868a2e6beefd87d71656def383a8c SHA-256: d1f2b230a4079648ec0aa5ae804b9045293a5eeb8af40ccc79d35dc69022542a
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating it's likely a phishing or trojan delivery mechanism. It functions as a link farm, with numerous URLs pointing to compromised WordPress sites hosting PDF files, suggesting a multi-stage attack. The document body is unreadable, but the heuristics and URLs strongly indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://mamproducciones.es/wp-content/plugins/formcraft/file-upload/server/content/files/1608833a10b5fe---gobedixemafopimusat.pdf
    • http://www.thediethub.in/wp-content/plugins/formcraft/file-upload/server/content/files/16080b5b429258---57475904554.pdf
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/b4d09a1f7042f3367c441f6e8c629380/nifekaminerofisej.pdf
    • http://dodici12.ru/wp-content/plugins/super-forms/uploads/php/files/f7urvamo6k11di4pl0qk5pphn2/61310167542.pdf
    • http://filtrydokoparek.pl/img/all/16902113905.pdf
    • http://forter.vn/hinhanh/file/roxuvonoweliluf.pdf
    • http://simonhoirup.dk/userfiles/file/xefufopuduwupefig.pdf
    • https://him-home.ru/wp-content/plugins/super-forms/uploads/php/files/40e99b6ea8ec1256be60403d0359156e/xupalodezidiwepa.pdf
    • http://www.thebetterinsurance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a008d973df3---pejemofaguxelatokajo.pdf
    • https://kolodezrus.ru/wp-content/plugins/super-forms/uploads/php/files/6fceeb981ea54a1ea4258d7b3000ebf3/33880756029.pdf
    • http://cohn-vossen.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d2ad8dbf8c9---jozawubasonenimok.pdf
    • http://www.stemcellhairclinic.com/files/files/wililifowawipiwudikis.pdf
    • https://hotelristorantenovecento.it/wp-content/plugins/super-forms/uploads/php/files/c4969182a262388d5c68a98dd1feecdf/88502464462.pdf
    • https://ratco-hardware.com/Ups/files/61132530486.pdf
    • https://shining4u.com/wp-content/plugins/super-forms/uploads/php/files/8b3116791d611c139adbd61756ac8ecc/zagunasifi.pdf
    • https://bliznacite.com/files/89713612919.pdf
    • http://uat.ideadunes.com/projects/ideadunes-portfolio-site/wp-content/plugins/formcraft/file-upload/server/content/files/1609f3ac4f228d---wogazo.pdf
    • https://ohligschlaeger-berger.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609be7d9f0a7f---36295403637.pdf
    • https://www.lumisolar.pe/wp-content/plugins/formcraft/file-upload/server/content/files/160826d6d2d3de---73378646196.pdf
    • http://modero.vn/upload/files/5173894500.pdf
    • https://kakvkusno26.ru/wp-content/plugins/super-forms/uploads/php/files/f0ed5d5da3f72baddfc3202f2ce7bde6/jabusumiziwijoneporobal.pdf
    • https://saatyapi.com/upload/ckfinder/files/xokopalavot.pdf
    • https://wholisticvibrations.com/wp-content/plugins/super-forms/uploads/php/files/b7dffacf690d90a7983dbda15001fe36/dusonoj.pdf
    • https://cspdental.com/wp-content/plugins/super-forms/uploads/php/files/48d1e4748ffb85fa9cd1c3e8dc0896d4/tokugasodineravamu.pdf
    • https://www.beachesbrewing.com/wp-content/plugins/super-forms/uploads/php/files/f3cfb7c28db2c16b8476085eba5ac3ff/vojefapodep.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=person+with+left+brain+dominant
    • 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_off0000ede5.bin
877dbf22cc8ef04d785a77ae0ed793e46fb00dde92dacf6379c6c5639d73bebf
pdf-font-stream PDF embedded font (sfnt) at offset 0xEDE5 10848 bytes
font_01_sfnt_off000106c6.bin
9f22a9ed26e4a4e6f9d2acfce316e13b097c42fde791e14eca6ca413e62ada16
pdf-font-stream PDF embedded font (sfnt) at offset 0x106C6 16360 bytes
font_02_sfnt_off000130b5.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x130B5 16792 bytes