Malicious PDF — malware analysis report

Static analysis result for SHA-256 2ec3d20661509513…

MALICIOUS

PDF

88.7 KB Created: 2021-06-27 01:49:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 1404ae46cf05f118df2746cde612e30b SHA-1: e53f807f27dd693543e15a67a876f936db55019f SHA-256: 2ec3d20661509513a999d4597b0dbabb2971bd6ae19b6ebacb6f3ea6a4162745
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous embedded URLs, many of which point to compromised WordPress sites, suggesting a phishing or malicious redirection scheme. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for distributing malware or leading users to phishing pages. No scripts were extracted, but the structure and URL patterns are indicative of a link farm used for malicious purposes.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://catamma.ru/uplcv?utm_term=difference+between+a+reactant+and+a+product
    • https://isleo.com/i_photos/file/61908817538.pdf
    • https://www.zaantraining.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608b2455206c4---mafatemafikoresolazo.pdf
    • http://artpolinakuzina.ru/pict/file/62930169099.pdf
    • https://www.arc-welding.co.uk/wp-content/plugins/super-forms/uploads/php/files/pi61dne96574cjb34ro03qfb9b/30959380449.pdf
    • http://vagtteam.dk/userfiles/Files/33679159320.pdf
    • https://www.gsccn.it/wp-content/plugins/formcraft/file-upload/server/content/files/160c2c003de6f6---bulaxesajozujaxafewuji.pdf
    • http://www.fullertherapy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608574c1e8490---gerone.pdf
    • http://colorfulmedia.de/fotki/fotki/file/81026928540.pdf
    • http://aep-tc.com/cache/fck_files/file/54907740532.pdf
    • https://www.lowdoc-loans.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160c0b7d905340---15001280974.pdf
    • http://relocationservicesgroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071d1d861fb2---33211838443.pdf
    • https://ols.lighting/wp-content/plugins/super-forms/uploads/php/files/3ae27a02ad06b557a9394103189fc020/79256967803.pdf
    • https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608c64010612d---65461478487.pdf
    • https://kodeac.com/wp-content/plugins/super-forms/uploads/php/files/r5bo2k1l5iml1i0m1toigko5ci/niwuvi.pdf
    • https://majorsagilekvaros.hu/uploads/file/bezuwaguludexi.pdf
    • http://exito-opakowania.pl/userfiles/file/85109082429.pdf
    • http://www.whirlpool-beachcomber.at/wp-content/plugins/formcraft/file-upload/server/content/files/160ba7659e5f9c---fosejuj.pdf
    • http://www.cuadernos.in/wp-content/plugins/formcraft/file-upload/server/content/files/1607d13fc07137---67478039856.pdf
    • http://atomleasing.ru/media/File/78302564021.pdf
    • https://cedarcreeksauce.com/wp-content/plugins/super-forms/uploads/php/files/dfdc22da43050f516b4a1b7de4829c54/82277229480.pdf
    • http://www.majoriscambio.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b8748ed6b3a---37661527130.pdf
    • http://goodtraefarm.com/ckupload/files/14813322291.pdf
    • https://apskarota.org/userfiles/file/ruguzaxemivedi.pdf
    • http://vilaportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/160820d07ad2d2---dubanodosiweju.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_off0000f795.bin
d5321210f4be8f12c82e110d54af767d1511f36b8b2800ff1a26a2a7ab14e8ad
pdf-font-stream PDF embedded font (sfnt) at offset 0xF795 17260 bytes
font_01_sfnt_off00012472.bin
7d7c956696bce1d605194fcb1975ee4f48e64547f960a1b51102ff300ce7d447
pdf-font-stream PDF embedded font (sfnt) at offset 0x12472 10724 bytes
font_02_sfnt_off00013d16.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13D16 16792 bytes