Malicious PDF — malware analysis report

Static analysis result for SHA-256 3f7076509b8bfe23…

MALICIOUS

PDF

76.6 KB Created: 2021-07-09 16:47:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 3e9ed5941804bfda5de09f47fb86cbb3 SHA-1: 76b676fc39654e8af612f00dd414260fe77ba759 SHA-256: 3f7076509b8bfe2342537a0c6bfb7da6ad2c12c4df9f960c30f7af9be2633f9c
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating it is likely a phishing or malware distribution lure. The document functions as a link farm, containing numerous URLs pointing to various websites, some of which are hosted on compromised CMS platforms. The primary purpose appears to be redirecting users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://drafthe.ru/uplcv?utm_term=notepad+to+jpg
    • https://accesoriosalmayor.com/images/userfiles/file/nogubepirigonemojidokijur.pdf
    • https://www.albispanaderia.com/wp-content/plugins/super-forms/uploads/php/files/f9c3400ed25b75bf73b7429286673d62/4696282923.pdf
    • http://www.majorisinvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160bc06620facf---munesidixibew.pdf
    • https://www.litesourcenc.com/wp-content/plugins/super-forms/uploads/php/files/d45951bfc92c23b826215b80c21609aa/lemesozozawot.pdf
    • http://g-shocktou.com/user_file/file/bivusoganolupevo.pdf
    • http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/ctb358k7cdt99ae9ffreo0ual3/bozubapus.pdf
    • http://dui-antidote.net/images/userfiles/file/vuxutenakima.pdf
    • http://alphasigmaoverseas.com/userfiles/file/lagutatosopadaziriziso.pdf
    • http://springswellness.net/wp-content/plugins/formcraft/file-upload/server/content/files/16081d50e91aea---xusidekijanazovap.pdf
    • http://www.gunyagder.org.tr/wp-content/plugins/super-forms/uploads/php/files/c5q92m3c17g2u82s118vm5m8p7/75417468274.pdf
    • http://asesorialuishervas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b3f123f281---56347841549.pdf
    • http://fluellensoflandreth.com/clients/b/bf/bfbe38bd58d8cb8bd08b82175287e3b3/File/20366268330.pdf
    • https://aronabritcan.com/userfiles/file/mefezim.pdf
    • https://www.intermediastudios.com.mx/wp-content/plugins/super-forms/uploads/php/files/31b203e49672fa3c741e6b90c835281a/70253440021.pdf
    • https://member-amz-seller-system.de/wp-content/plugins/super-forms/uploads/php/files/6dfd717d060da8c1a7e535efc1685a34/radipaziguwurerubamuzaguk.pdf
    • http://al-bandak.com/userfiles/file/96199085204.pdf
    • http://kursadowicz.pl/Upload/file/55996034732.pdf
    • http://vishwkarmaenterprises.com/webroot/img/userfiles/files/savut.pdf
    • https://aldwalia.com/userfiles/files/gaximu.pdf
    • https://hps-gruppe.com/wp-content/plugins/super-forms/uploads/php/files/afp73gfdp6r934t3lgv670fcir/pugazitu.pdf
    • http://kasystemofkarate.com/clients/861259/File/ruwabewaz.pdf
    • https://elitteaccesorios.com/wp-content/plugins/super-forms/uploads/php/files/pb4m4rquotv6dcrc2b920spv0d/wotegalutomojuv.pdf
    • http://for-rent-leuven.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5f128efa76---legaroxajojazikoregisoja.pdf
    • http://churchliferesources.org/wp-content/plugins/formcraft/file-upload/server/content/files/160ccc1775e2ad---jamavuxavesopotitarigikej.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_off0000cbc0.bin
071fa735303e7e30be59ae0affb7a29255333de41feeaa2444eaf5462bd1c4b9
pdf-font-stream PDF embedded font (sfnt) at offset 0xCBC0 16444 bytes
font_01_sfnt_off0000f676.bin
5a8b539e55e0d9c0b3cb676a68165289894ea5d5859da0bc104797b621fdd77d
pdf-font-stream PDF embedded font (sfnt) at offset 0xF676 10164 bytes
font_02_sfnt_off00010d1a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10D1A 16792 bytes