Malicious PDF — malware analysis report

Static analysis result for SHA-256 6a06d00c0b141527…

MALICIOUS

PDF

110.1 KB Created: 2021-06-28 21:57:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 7365b9d08ecba684b2174df6e3fa4f93 SHA-1: f8c7fe6c30ec44eee1e450a35b240389b9fe17ce SHA-256: 6a06d00c0b14152755946b7a66ce772681649cdbe7922e06d6325d19ed89e2bb
156 Risk Score

Malware Insights

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

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 compromised CMS uploads and disposable hosting domains. The document body is heavily obfuscated, preventing a clear understanding of its specific lure, but the overall structure suggests an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9937

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://1hozain.ru/files/userfiles/files/84472059877.pdf In PDF document text
    • http://www.iso-clean.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16092aba293b88---zewagufumugovoxux.pdfIn PDF document text
    • http://aven.su/userfiles/file/96334593841.pdfIn PDF document text
    • https://relaxationplusmn.com/wp-content/plugins/super-forms/uploads/php/files/9f695afb4bdb8c7ce691ce4011dafca6/89813962727.pdfIn PDF document text
    • http://www.bestlifepolicy.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607a3d3f57a05---neraguzawixijofagab.pdfIn PDF document text
    • https://beribuket.ru/wp-content/plugins/super-forms/uploads/php/files/42f017cef63c442fcd31aa42184e79db/75140298679.pdfIn PDF document text
    • https://www.simcoerecovery.net/wp-content/plugins/super-forms/uploads/php/files/8pvu02i4lh8q4oiufnjc7drh3a/xivaxewovawoxafomipanij.pdfIn PDF document text
    • https://www.kiteschule-eckernfoerde.de/wp-content/plugins/formcraft/file-upload/server/content/files/16077901db1da9---xeweguvugekanekazepenufen.pdfIn PDF document text
    • http://emilygrilltogo.com/uploads/files/89954206582.pdfIn PDF document text
    • http://mijneigenlift.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609105f98ed4a---25565477381.pdfIn PDF document text
    • https://www.hemoroidklinigi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607082b486227---93539028257.pdfIn PDF document text
    • https://wecafephuket.com/wp-content/plugins/super-forms/uploads/php/files/ecq58fj8n3qa14si32461i4plh/rujizuwupaxo.pdfIn PDF document text
    • http://conservationenergy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac47d2e4619---loropekemawiwo.pdfIn PDF document text
    • https://schmitz.cz/res/file/39777344153.pdfIn PDF document text
    • http://mooneyes.pl/userfiles/file/winizizita.pdfIn PDF document text
    • https://quangcaowebsite.vn/uploads/files/86090761505.pdfIn PDF document text
    • http://pivotal-technologies.com/userfiles/file/gobojunoz.pdfIn PDF document text
    • https://drivingschoolofnorthtexas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d6189ac056e---55283048919.pdfIn PDF document text
    • http://a-kamen.com/userfiles/file/15797883645.pdfIn PDF document text
    • https://inchiriereelicoptere.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1608740cc06d68---73829389231.pdfIn PDF document text
    • http://dangkyidol.com/wp-content/plugins/super-forms/uploads/php/files/mj0d72oa8bou065lto6417043c/zexipevo.pdfIn PDF document text
    • http://opalbiosciences.com/wp-content/plugins/formcraft/file-upload/server/content/files/160725eb60b36c---56403011166.pdfIn PDF document text
    • https://serwisnawigacji.pl/userfiles/file/ginibedokepilijaba.pdfIn PDF document text
    • https://coloreverything.love/wp-content/plugins/super-forms/uploads/php/files/daece489fc4704be69f75229bf376916/peziwuvofegatadurimil.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=how+do+you+find+the+point+of+intersectionPDF 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_off000143c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x143C5 20304 bytes
SHA-256: e51bddd29957ad281917b77f9c4e2dd3fb334ab3f09d6a51faa563f8e63ecf7c
font_01_sfnt_off000179ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x179BA 10800 bytes
SHA-256: 610de5e5f3fdcd4a9e1bfdc3c7401eb0e3d7818dd5e1ae08212adb4d1f878d96
font_02_sfnt_off00019297.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19297 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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