Malicious PDF — malware analysis report

Static analysis result for SHA-256 1949e8772cc94dc1…

MALICIOUS

PDF

77.4 KB Created: 2021-09-13 01:55:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 444d2edeeca95050436f6a7ef987d3cb SHA-1: a11cc9e4caeba213083abc1e98ee42f0ffa05fc7 SHA-256: 1949e8772cc94dc1cdaf8614188cb58bcce46704212f5adc88e6a58a45716f48
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress installations, suggesting a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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 https://www.geosuiteonline.de/wp-content/plugins/formcraft/file-upload/server/content/files/16137df6323d98---89378628644.pdf
    • http://hanleyresources.com/images/bajemadalagokekovutis.pdf
    • http://ettorebelfioreliutaio.it/userfiles/files/83527786399.pdf
    • http://www.marsagri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e7a34595a9---tesininefowotewof.pdf
    • http://karat-dobremiasto.pl/userfiles/file/sufejefo.pdf
    • http://15441707.com/data/board/file/20210904040659.pdf
    • http://aan.kz/ckfinder/userfiles/files/65555894657.pdf
    • https://creteotels.gr/FCKeditor/userimages/file/tokovadijejoxutasapu.pdf
    • http://synagoge-stommeln.de/ckfinder/userfiles/files/pizomomewotodokipabivave.pdf
    • https://www.sahabatkeluargahomecare.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135c06199f6a---ximakegirupudezifivivavo.pdf
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/819cfa745b1a61963d36b1d10c00a3cf/61315373695.pdf
    • http://free-note.kr/files/fckeditor/file/3779853161371bedee2bd.pdf
    • https://westhigienia.hu/editor_up/nosutuweve.pdf
    • http://mexxeopaint.com/upload/files/70413099099.pdf
    • http://luxcottage.ru/stroykamen/userfiles/file/44870570991.pdf
    • http://clubesquilacoma.com/uploads/files/71386361003.pdf
    • http://ajej.pretty-match.com/upload/files/28234269017.pdf
    • http://balcimimarlik.com/resimler/files/litalawonajeje.pdf
    • https://stehovani-ostrava.cz/static_pages_files/file/50682887498.pdf
    • http://fujiya-la.com/uploads/files/voxabejerutobexijex.pdf
    • http://autoscuolavalerio.it/userfiles/files/44771820691.pdf
    • http://biosystech.com/pdsFck/file/7332100371.pdf
    • https://ksboutlet.com/file/files/suvipe.pdf
    • https://atrax.hr/files/62696644165.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=online+tv+website+free
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cd03.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xCD03 16792 bytes
font_01_sfnt_off0000e51a.bin
f8b5215ed3fcf56a7e17a8744d54a5ce6c7b21c599d9b6bc34b17915b35d55b3
pdf-font-stream PDF embedded font (sfnt) at offset 0xE51A 10244 bytes
font_02_sfnt_off0000fc55.bin
dee87e3c6384b0e4e62dcb73bc4faeca2711177694ebfafd6402b63b797b85ee
pdf-font-stream PDF embedded font (sfnt) at offset 0xFC55 16944 bytes