Malicious PDF — malware analysis report

Static analysis result for SHA-256 02e70ed04bd06f60…

MALICIOUS

PDF

77.6 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: 95f28e230b753a98c7e06f959747a08b SHA-1: b2ba450ae6159a5b962c65188ff3aea86e065d8f SHA-256: 02e70ed04bd06f60139cd6c359fbee4813c6d99828df8ace368bc382cd788fa4
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a link farm with numerous URLs, many hosted on compromised or disposable domains, indicating a phishing or malware distribution attempt. The ClamAV detection as 'Pdf.Phishing.Trojan' further supports this assessment. Although no scripts were explicitly extracted, the structure and heuristic firings suggest the document is designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.4400

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
  • PDF differential parser failed info PDF_DIFFERENTIAL_PARSE_FAILED
    The cross-check parser (pdfminer.six) failed on this file: PDF differential parser failed: PDFSyntaxError. Static heuristics still ran and any of their findings above are valid; only the differential cross-check signal is missing.
  • 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://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