Malicious PDF — malware analysis report

Static analysis result for SHA-256 baadf0f19c44251b…

MALICIOUS

PDF

80.7 KB Created: 2021-09-13 13:45:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 4c6a89a8fb10d4608b37dda3aa084820 SHA-1: 9b7bd962f19504ce51224353b1ac44a4b905245e SHA-256: baadf0f19c44251b4d20e7cf6737f2265236f6b9d3fa17ddde4ed9f0bed3f8d3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised or disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious document lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://optimumnieruchomosci.pl/uploads/userfiles/files/venafibegusogebumigogav.pdf In PDF document text
    • http://weifong.tw/fckimages/file/77389842312.pdfIn PDF document text
    • http://veganogle.es/uploads/ckfinder/files/xaruxagetofawexilad.pdfIn PDF document text
    • http://cdmvt.cz/sites/default/files/53680456810.pdfIn PDF document text
    • https://bistakalikotenetwork.com/userfiles/file/xolososugelunuf.pdfIn PDF document text
    • http://nandishoverseas.com/UserFiles/File/xuzipupabudakexobubeb.pdfIn PDF document text
    • http://www.opencalgary.org/wp-content/plugins/formcraft/file-upload/server/content/files/16131bbe7b4a88---mufeni.pdfIn PDF document text
    • https://blokhol.com/upload/files/biguradowuduxufijif.pdfIn PDF document text
    • http://it-hair.com/userfiles/80999323783.pdfIn PDF document text
    • http://elandtour.com/FileData/ckfinder/files/20210912_04E8782695A8363A.pdfIn PDF document text
    • https://stpatswatertown.org/ckfinder/userfiles/files/vajewenanidibarot.pdfIn PDF document text
    • http://urbanelect.com/userfiles/file/22066361792.pdfIn PDF document text
    • https://medsplus.us/admin/images/file/46409698499.pdfIn PDF document text
    • https://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613517e15aacb---wetaxusimuwotabotug.pdfIn PDF document text
    • http://maekuangudomthara.com/ckfinder/userfiles/files/misavogadunaj.pdfIn PDF document text
    • https://oferta.lt/i/File/zujoxim.pdfIn PDF document text
    • http://www.saaegfpolis.org.br/ckfinder/userfiles/files/detitupatarolipe.pdfIn PDF document text
    • https://istanajp.net/contents/files/41123224345.pdfIn PDF document text
    • http://futureinfashion.com/ckfinder/userfiles/files/46909121537.pdfIn PDF document text
    • http://www.catalogodecineargentino.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131814e6132f---fitaguxitareso.pdfIn PDF document text
    • https://globalmediaminds.com/uploads/files/jibudulodinepoxixitizazav.pdfIn PDF document text
    • http://kleinschadenexpert.com/userfiles/file/roliwuk.pdfIn PDF document text
    • http://thingsantiquesla.com/userfiles/files/17075255702.pdfIn PDF document text
    • https://www.jahnigterbraak.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613cfc86ce6a4---tajedasixinazufese.pdfIn PDF document text
    • http://nitecoreromania.ro/files/file/99472322827.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=how+to+make+a+google+account+on+androidPDF 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_off0000d67d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD67D 10816 bytes
SHA-256: 1872fa9d522691ad18247c6f265b5b9eaa54b1db83bd5764219d43c3ee16d1a3
font_01_sfnt_off0000ef29.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF29 17568 bytes
SHA-256: 31fadeefdbcd873db8c5ff47a2c390153a3430c36c66ca702826af4f312572ea
font_02_sfnt_off00011cfe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CFE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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