Malicious PDF — malware analysis report

Static analysis result for SHA-256 54dfc82c6ee57efe…

MALICIOUS

PDF

82.9 KB Created: 2021-08-19 09:32:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 587284aac6f437d504be7c2964a8616b SHA-1: 9293eb50a6574ae573e99a71e493ff772bac591f SHA-256: 54dfc82c6ee57efe1303d0fec46a6864ec8f96b80a91d2ca96001485549fbdd8
156 Risk Score

Malware Insights

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

The PDF document contains a large number of links, many of which point to websites hosted on compromised WordPress installations or disposable domains, indicating a link farm designed to distribute traffic or host malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9944

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://se-ty.ru/uploads/userfiles/file/20075271174.pdf In PDF document text
    • http://fly.no1-yes.com/userfiles/file/juripatufifuzifov.pdfIn PDF document text
    • https://pfgmm.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16074231b6c946---jopixavadakak.pdfIn PDF document text
    • http://debandhelder.nl/ckfinder/userfiles/files/panovaditojimolipurowi.pdfIn PDF document text
    • http://dzbnf.com/upload/file///47680453192.pdfIn PDF document text
    • http://www.nbrownies.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1610f3b9ec8459---rerexi.pdfIn PDF document text
    • http://urdu-hadith.com/survey/userfiles/files/sukolumevekolad.pdfIn PDF document text
    • https://ahi.com.ua/wp-content/plugins/super-forms/uploads/php/files/e1b82bbfddc03f597323b89275f96738/49753563254.pdfIn PDF document text
    • http://deurwater.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd6b6e5b0d8---tuwatategati.pdfIn PDF document text
    • http://ketoanantamhcm.com/uploads/files/45334919235.pdfIn PDF document text
    • https://bladmedyczny24.pl/wp-content/plugins/super-forms/uploads/php/files/8e9209eeac20ac37d1d571ec35d3259c/23246137034.pdfIn PDF document text
    • http://globalquestconsulting.com/userfiles/files/34206999575.pdfIn PDF document text
    • http://www.peplex.it/wp-content/plugins/formcraft/file-upload/server/content/files/160731e3a4eb32---towidijokudukejo.pdfIn PDF document text
    • https://lbjgold.in/ckfinder/userfiles/files/begubonoma.pdfIn PDF document text
    • https://aquaticlandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a113e517fc3---35678998230.pdfIn PDF document text
    • http://fiumaradelsossio.it/userfiles/files/rusobu.pdfIn PDF document text
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/060125b95fad2c76e5fae7ce0cf793ab/rakimuzuxowoxatarox.pdfIn PDF document text
    • https://bayardplaza.co.uk/wp-content/plugins/super-forms/uploads/php/files/t33jjoq7aur4b6n46vnr34sfte/rofamugexikulutijekit.pdfIn PDF document text
    • http://www.grundys.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160760f1e0646d---74247783055.pdfIn PDF document text
    • http://drthchowdary.net/userfiles/file/zupesemitufemazadilefe.pdfIn PDF document text
    • http://farmaciafasolis.eu/userfiles/files/fagixa.pdfIn PDF document text
    • https://coloreverything.love/wp-content/plugins/super-forms/uploads/php/files/80a2f0a2ee63b88acb599619bcbf1e8b/76294900268.pdfIn PDF document text
    • http://subventionsbetrug.de/wp-content/plugins/super-forms/uploads/php/files/f23p8f3qqdmv8e3uf30ijpireu/11416795294.pdfIn PDF document text
    • http://montagnobozzone.it/userfiles/files/nifegaxoropirafabefituf.pdfIn PDF document text
    • http://kayamedbursa.com/userfiles/file/1931171410.pdfIn PDF document text
    • https://nuevocoach.co.uk/wp-content/plugins/super-forms/uploads/php/files/aa4217d3fc7d7ffc11d524ea1acf0325/84508082616.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=adverbs+worksheet+for+4th+gradePDF 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_off0000e09a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE09A 16740 bytes
SHA-256: 1ae8d06fe2aac01e536aa79527f01cd4fca6c95b9446c19051e4ae5a488c848a
font_01_sfnt_off00010c15.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C15 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001242c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1242C 10836 bytes
SHA-256: 724ff89c1f68c4d3d812d41374fa1c44f992045641ba3a16d9fbb3c9b3ff19a3

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