Malicious PDF — malware analysis report

Static analysis result for SHA-256 3eaed6a33eb84835…

MALICIOUS

PDF

87.2 KB Created: 2021-07-18 19:34:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 7c89befb5177c527bbd85d0631f0ee1c SHA-1: 3797608d0ae64b3971e00bf4d09df24511d662f8 SHA-256: 3eaed6a33eb84835500a0408dab7c6a7292ce38f5b6014119c9de74b4344227f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains a link farm pointing to multiple compromised WordPress upload directories, suggesting an attempt to host malicious content or redirect users to phishing sites. The presence of embedded URLs and the structure of the PDF strongly suggest it's part of a phishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/2372sbhqahct03sjtv93fjodme/mifit.pdf In PDF document text
    • https://www.analfissur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ea9f45e413---lagukomuviwapoxab.pdfIn PDF document text
    • http://comicpapyrus.com/wp-content/plugins/super-forms/uploads/php/files/8fba97f8d8610437cc89ecc6f2464247/82328536464.pdfIn PDF document text
    • http://asu.com.vn/wp-content/plugins/super-forms/uploads/php/files/14q9nanffh7b5uqcqesqik0uu9/56733315507.pdfIn PDF document text
    • https://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/feaf487f5a898d46f971cc92f481a713/25823302332.pdfIn PDF document text
    • https://otartufo.com/ckfinder/tartufofiles/files/4098709423.pdfIn PDF document text
    • https://hightechrustremovers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a75509f2ba8---46717703493.pdfIn PDF document text
    • https://www.justgym.co.za/wp-content/plugins/super-forms/uploads/php/files/8fhv3ullk7p1737ul20d9p9qni/73972926040.pdfIn PDF document text
    • http://abwingsbuffalo.com/uploads/files/kupikemamobozonesodijovim.pdfIn PDF document text
    • http://fszhenjia.com/upfolder/e/files/20210623101415.pdfIn PDF document text
    • https://nowackleverkusen.de/wp-content/plugins/formcraft/file-upload/server/content/files/16095c3bb330d2---46141599943.pdfIn PDF document text
    • https://jamiatulbanat.in/wp-content/plugins/formcraft/file-upload/server/content/files/1607002553fba5---mijugo.pdfIn PDF document text
    • https://homeaestheticsllc.com/wp-content/plugins/super-forms/uploads/php/files/ec060ddebb3583e73eba3f37aea29d97/89556873805.pdfIn PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/e99453e101ec51a915ecb983cda78fe6/57648193804.pdfIn PDF document text
    • https://aspaeng.com/files/image/files/dawijevusebubodola.pdfIn PDF document text
    • https://metroguards.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1606ce552d507b---wefojejawogovesesubi.pdfIn PDF document text
    • http://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160aee62711e2b---daweduxux.pdfIn PDF document text
    • http://ontheedgeofnow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b1357d5879---93355686019.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e403d7e2f5---96166569043.pdfIn PDF document text
    • http://techhssilverbuffs.com/clients/61416/File/10838934406.pdfIn PDF document text
    • http://www.klimavill.com//data/editorfile/33765343002.pdfIn PDF document text
    • https://vipbeachhouse.com/uploads/editor/file/19845931619.pdfIn PDF document text
    • http://solmoda.it/userfiles/files/feromufutotaziju.pdfIn PDF document text
    • http://www.alquilerbares.com.ar/wp-content/plugins/formcraft/file-upload/server/content/files/16082db1fa167f---latino.pdfIn PDF document text
    • http://phelieuviethung.vn/upload/files/zibotelirogawoxopuz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=hair+salons+for+blondes+near+mePDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f229.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF229 10548 bytes
SHA-256: 05ae9dc156f736adbaf656f000b0358bfc3608c723ff928ad7bf590fa4e1a2ef
font_01_sfnt_off00010a14.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A14 17448 bytes
SHA-256: 2fec78481df98d03b1c57b55a9b8aab768f83bf05194a7b38783eeaa377d0f1c
font_02_sfnt_off00013796.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13796 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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