Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef49adc67a205506…

MALICIOUS

PDF

81.5 KB Created: 2021-06-26 08:53:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 2351b8285c2e2980f5cd7e068dc2b9f8 SHA-1: 5a6d3b85f6f0b4008f74d8eed95cea8db4dcbb9c SHA-256: ef49adc67a2055063e1170bb70b30816b796934a4a7e64df4a4316c93c8c07bc
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with numerous URLs pointing to disposable or compromised hosting. The document body is heavily obfuscated, preventing analysis of its direct content, but the presence of many links suggests a redirection or phishing attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://beaszemin.com/files/98823786263.pdf
    • http://tumwebthailand.com/ckfinder/userfiles/files/talimadiwoto.pdf
    • http://fst-uinsu.net/userfiles/files/sawutas.pdf
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/f64ea14d8cd0babcc1d0642ae9558cfa/bibovaxodiwesijebivepega.pdf
    • http://deauville.ru/files/file/3533005198.pdf
    • http://longhornrings.com/clients/0/08/08da48574b41509ac7bedcf2500dc652/File/wovifamorimowowudid.pdf
    • https://lawyerupsmart.com/tempimg/file/remunuzifijasuna.pdf
    • http://abnicum.com/files/file/85518327684.pdf
    • http://baanpowertrain.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076138643a0b---19790440563.pdf
    • https://mymovingestimate.com/wp-content/plugins/super-forms/uploads/php/files/1f3957a14c876804da2de8ce8ecb497b/zivuguxividifuxufokikozab.pdf
    • https://codecs.ro/images/file/wejivinesozuropiv.pdf
    • https://www.harasportcenter.com/wp-content/plugins/super-forms/uploads/php/files/lrbbdb7kupsmggim3s2h84o0sm/mebunijik.pdf
    • https://athensviptour.com/wp-content/plugins/super-forms/uploads/php/files/df6d41a943034786fb9b27f9d9a79a48/58874868806.pdf
    • http://uyaviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609684dc9f430---mizugajozabe.pdf
    • http://doubletroubels.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077e1597e521---27354988806.pdf
    • http://boxethai38.com/upload/file/39753610069.pdf
    • http://bazatalty.pl/wp-content/plugins/super-forms/uploads/php/files/40b7cb42e14bbc072a7e695994193734/44245738727.pdf
    • http://www.kocay.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1609422ebe5455---66837782452.pdf
    • https://www.projectorrentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607142f875d21---23331803285.pdf
    • http://boulderdivorcelaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609837f10f49b---26841239441.pdf
    • https://oneremote.ru/wp-content/plugins/super-forms/uploads/php/files/53075c828492b871298aabb67ec08aaa/15009090978.pdf
    • https://www.lowdoc-loans.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160b40476dc623---luladofo.pdf
    • http://valleypainclinic.org/userfiles/file/rogezu.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=sql+where+clause+multiple+values
    • 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_off0000dacf.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xDACF 16792 bytes
font_01_sfnt_off0000f2e6.bin
d2dd69b15eef3064849b3bd88871c084f1d1af88ecffc94fa1bbf363a8703379
pdf-font-stream PDF embedded font (sfnt) at offset 0xF2E6 10888 bytes
font_02_sfnt_off00010c24.bin
6cad3b1f7acb037f6adcc8c8dd4ae147ef27cff5fbc960026ca27307a4e16f1f
pdf-font-stream PDF embedded font (sfnt) at offset 0x10C24 17092 bytes