Malicious PDF — malware analysis report

Static analysis result for SHA-256 ee0544581530781e…

MALICIOUS

PDF

79.1 KB Created: 2021-09-06 01:10:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: dd8deece48a6e4a90ddab25928a8eb85 SHA-1: 3f71c5e5c92794a31bbaee9344fdec818fe82694 SHA-256: ee0544581530781e2bda0dc022e42266ceea70cb215ce9b54816f34711691eb2
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. It contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, indicating a link farm designed to redirect users to malicious content. No scripts were extracted, but the structure and heuristics strongly suggest a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://krindustria.com.br/site/wp-content/plugins/formcraft/file-upload/server/content/files/1607d7bc9a9187---66435003722.pdf In PDF document text
    • http://garderoba.sk/images/_file/texelijonav.pdfIn PDF document text
    • https://zifu-tech.com/app/webroot/userfiles/files/juserudojuju.pdfIn PDF document text
    • http://cpgny.com/userfiles/files/doluvupimimomebapikuvela.pdfIn PDF document text
    • http://wolfroccatiassociati.it/userfiles/files/71472282079.pdfIn PDF document text
    • http://happy-travel089.com/CKEdit/upload/files/68952069148.pdfIn PDF document text
    • http://www.gametimecatering.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a41bf5cfea2---94962908653.pdfIn PDF document text
    • https://heritagelogs.com/wp-content/plugins/super-forms/uploads/php/files/2svcembf2imd83phuaitvf57hf/94462582120.pdfIn PDF document text
    • http://waukeganeast1980.com/clients/877304/File/pabekukepiga.pdfIn PDF document text
    • http://familiegravesen.dk/ckfinder/userfiles/files/18399624345.pdfIn PDF document text
    • https://www.sacproblemleri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6858ee10c3---18377618274.pdfIn PDF document text
    • http://www.northeastmarquees.com/wp-content/plugins/super-forms/uploads/php/files/314cb092c4be800002ee5ea06cee92b8/subasuwirataw.pdfIn PDF document text
    • http://www.primalegal.eu/wp-content/plugins/super-forms/uploads/php/files/2e19pqrcdrvehoar3gonqn9kb6/35730318117.pdfIn PDF document text
    • https://relleno-acidohialuronico.com/wp-content/plugins/super-forms/uploads/php/files/744656c0ef7bc0f9cf538c3f31d77775/7234604400.pdfIn PDF document text
    • https://finestblogger.de/wp-content/plugins/super-forms/uploads/php/files/u3lrar74mu6j3ra0dl17u3lk00/87120519316.pdfIn PDF document text
    • https://777mto.info/contents//files/worejupefituvadevat.pdfIn PDF document text
    • http://derma-dts.de/files/file/17053554403.pdfIn PDF document text
    • http://kamnitikamini.si/upload/files/tigobawudiribezifobotojum.pdfIn PDF document text
    • http://mateuszkucharski.pl/admin/file/24335620689.pdfIn PDF document text
    • http://kingspec.su/wp-content/plugins/super-forms/uploads/php/files/o5vo0ki52lb1622mbgvlci27ma/65375088632.pdfIn PDF document text
    • https://mmszke.hu/files/file/zetide.pdfIn PDF document text
    • http://novichiha.ru/pic/file/2791895522.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=thermodynamics+11th+physics+pdfPDF 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_off0000cfd4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFD4 17648 bytes
SHA-256: a18ef5c6ef28ec7c6be5256fd6993010722f2ee72197b6992ab9a3072a736355
font_01_sfnt_off0000fd59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD59 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011570.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11570 10968 bytes
SHA-256: 857e1a380f79347ed7c40f4112278268ecfd5fca381b73fd4ac24418f46669cd

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