Malicious PDF — malware analysis report

Static analysis result for SHA-256 e543842545db8b71…

MALICIOUS

PDF

79.7 KB Created: 2021-07-04 04:55:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 2969a973ea2f985f81936845eae38c58 SHA-1: 25ca32fd11a39f4c1c2ec84022d67bfa6b0663bc SHA-256: e543842545db8b7177d480aa879146cabb323ea8d947d9c94dd5f2976c930fe5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous links pointing to compromised WordPress sites, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a malicious document, likely delivered via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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://doitsolutions.co/wp-content/plugins/super-forms/uploads/php/files/f676756b2db347075176017ddbc55bd9/zubuselutitagiduvotemug.pdf
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/e458e5944a86411c93a9cf8309939b8b/48557070959.pdf
    • http://lookupagency.es/wp-content/plugins/formcraft/file-upload/server/content/files/16094139bcbe76---44588474998.pdf
    • http://dom-nenilovo.ru/wp-content/plugins/super-forms/uploads/php/files/8478fb97972741e7fa476b36f2adccc6/kafaworagunapinixazozur.pdf
    • https://apexforestservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607edb3281327---52125135741.pdf
    • https://islandsvefir.is/wp-content/plugins/super-forms/uploads/php/files/loe5hl445jfqcb0tjv8shf314t/siwulumisefalavexubejava.pdf
    • http://capital96.com/userfiles/file/kexep.pdf
    • http://eotp.info/sites/default/files/fck/file/6372390509.pdf
    • http://dermalab.pl/userfiles/file/nevixuwisoposavo.pdf
    • https://big-cash.de/wp-content/plugins/super-forms/uploads/php/files/68iqs07c9kcihhbsnfbecvq4f0/9521502985.pdf
    • https://www.dazzlingdecor.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160aaddad11d1d---92702785160.pdf
    • https://erinmillssmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/e322kaa9hov45ch4k1evmpb5n3/65155174738.pdf
    • https://mfdesign.hu/files/file/pozob.pdf
    • http://savalis.ru/userfiles/file/dafaranerodojazu.pdf
    • http://www.canadiantreasurer.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609baaae8613a---15691260596.pdf
    • http://www.doctor-carpet.com/wp-content/plugins/super-forms/uploads/php/files/6jg7jhv7dto3672c65da46b8k5/satilowipikadufewimigijot.pdf
    • http://theydeserveastamp.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609dc5321387b---kalopazowegoze.pdf
    • http://localhomesales.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160805f4f4bf40---falofiwijejuxaw.pdf
    • http://progfin.pl/userfiles/file/38901512347.pdf
    • http://www.veronicaneal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/160a89e26142a0---62565076059.pdf
    • http://www.ponderosafestival.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088b6397a6df---tivono.pdf
    • http://globalbando.com/DATA/upload/files/202106201148046938.pdf
    • https://lapalettedesarts.fr/gestion/file/86818449885.pdf
    • http://ff-engineering.com/userfiles/files/80833934593.pdf
    • https://lakeshoresmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/0bj8qkbok5tl5ttiqbvtt4l626/gazebutuwovafonimitusipap.pdf
    • https://xn--64-mlcufjjaii0l.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/b5f4d81cc9e2b2a888a62112773f04d0/2207156574.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=torque+practice+problems+worksheet+with+answers
    • 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_off0000d3f9.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xD3F9 16792 bytes
font_01_sfnt_off0000ec0b.bin
102d2b28eeb6781f840554078c62dc612c93bdc9fb66ac15b37fbfe1b21d3b3b
pdf-font-stream PDF embedded font (sfnt) at offset 0xEC0B 16796 bytes
font_02_sfnt_off00011784.bin
dd02d8657b983fd5911d1d5b77bc5e7466fb696c1c1d27f569ac6a74b0c22187
pdf-font-stream PDF embedded font (sfnt) at offset 0x11784 11164 bytes