Malicious PDF — malware analysis report

Static analysis result for SHA-256 1c51eddd790d60d1…

MALICIOUS

PDF

78.1 KB Created: 2021-09-12 11:25:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: ab49f0c3fcf70536a71355eb73e214cc SHA-1: ee26330819f670339e7633407796be2ce1bc6c82 SHA-256: 1c51eddd790d60d126fbffc0ee3b9db242204355ecf8eded9cdd2568c94d7184
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including ClamAV and an ML classifier, indicating malicious content. It contains a significant number of links pointing to various domains, many of which are associated with compromised CMS uploads or disposable hosting, suggesting a link farm or phishing lure. The presence of external URIs and the overall structure strongly suggest an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://idominjazz.com/fckeditor/userfiles/image/bevonutukodozuludolugurov.pdf In PDF document text
    • http://studio-rivetti.it/userfiles/files/sujefewelofomixudulur.pdfIn PDF document text
    • http://www.taxivanclass.com/uploads/ckfinder/files/89833873688.pdfIn PDF document text
    • http://studioprogettoarchitettura.eu/userfiles/files/90081952811.pdfIn PDF document text
    • http://myepres.com/HotelEstimator/userfiles/file/91316707446.pdfIn PDF document text
    • http://elencostruzioni.it/userfiles/files/bakosulekisexozin.pdfIn PDF document text
    • https://cobaltinc.org/userfiles/file/ruzativarujisafilesipuji.pdfIn PDF document text
    • https://livresdarts.com/ckfinder/userfiles/files/fenunenosibopesamasuxatox.pdfIn PDF document text
    • http://www.europesolidaire.eu/userfiles/files/janozazoto.pdfIn PDF document text
    • http://karinameal.ru/imgdish/files/pozegarovaxolifisepufot.pdfIn PDF document text
    • http://exmar.it/foto_fck/file/88822094907.pdfIn PDF document text
    • http://theexplorerthai.com/userfiles/files/bapulokemafofosekunuxawo.pdfIn PDF document text
    • http://eastendmediation.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/ganotoxekosodisomati.pdfIn PDF document text
    • https://masini-de-ambalat.ro/images/userfiles/91656436430.pdfIn PDF document text
    • http://topopentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613983e70c9e3---vokafokixafevorugivoku.pdfIn PDF document text
    • http://rent-lease-no1.com/userfiles/file/20210912131635.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137f7eb11342---43194604843.pdfIn PDF document text
    • https://bringem.de/wp-content/plugins/super-forms/uploads/php/files/270c282e9ff82b02645b9b9e19de1a4e/86389279134.pdfIn PDF document text
    • https://tempatpasang.com/contents/files/ripasajakofuwi.pdfIn PDF document text
    • https://ruxthai.com/ckfinder/userfiles/files/laguvaje.pdfIn PDF document text
    • http://araratmebel.ru/img/file/resegew.pdfIn PDF document text
    • https://rt-totaalafbouw.nl/userfiles/file/somokejusazepupeweg.pdfIn PDF document text
    • https://karapinler.com/calisma2/files/uploads/74705356386.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=beach+buggy+racing+android+tvPDF 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_off0000cda6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDA6 17048 bytes
SHA-256: af4d6f51cbaf600a2f0621c749e187534ab4b5190f3c6b2e4b3f98d799d0eddc
font_01_sfnt_off0000f980.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF980 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011197.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11197 10908 bytes
SHA-256: 4be81081d28255202fd5438188d3094abc6755701543463bfd67ce615881cefe