Malicious PDF — malware analysis report

Static analysis result for SHA-256 800d05968d347324…

MALICIOUS

PDF

79.3 KB Created: 2021-09-20 20:01:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: a5f89e6502edba5b98cc4c12e968cb7c SHA-1: ad513c6ec2b7aaeac5d12b837b0f982ddeb97d99 SHA-256: 800d05968d34732410c281ff6c73075942d9b926d5b3aaf72f2e7df75d6bfcb1
156 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to disposable hosting or compromised CMS upload directories, indicating a link farm or phishing lure. Heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' strongly suggest this malicious intent. The ML classifier and ClamAV detection further confirm its malicious nature, likely as a phishing or SEO-poisoning document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://argol-editions.fr/userfiles/file/texudo.pdf In PDF document text
    • http://lenosada.sk/editor_uploads/files/vuvidanevenoburujexuzitib.pdfIn PDF document text
    • https://hunghiephuylog.com/upload/files/87691361787.pdfIn PDF document text
    • https://advantagelic.com/singhania/downloads/file/gegajugezoludijirid.pdfIn PDF document text
    • http://gomientrung.vn/uploads/image/files/lanuxorip.pdfIn PDF document text
    • http://hidropro.hu/upload/85105738118.pdfIn PDF document text
    • https://luckyfood.itweald.com/uploads/files/613b9fc5e0f93.pdfIn PDF document text
    • https://bnbtravels.com/ckfinder/userfiles/files/kekasukizuzajususaviris.pdfIn PDF document text
    • https://n95america.com/wp-content/plugins/super-forms/uploads/php/files/ac8349ace3b58c561494dcc764bbe9f5/tojukuzarodetetubomufabu.pdfIn PDF document text
    • http://zamgph.com/FCKeditor/editor/filemanager/connectors/php/uploads/file/042101548581.pdfIn PDF document text
    • http://www.patricktennis.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1614002c2da3cc---kekolufegitaxanosox.pdfIn PDF document text
    • http://ageofwonders.buka.ru/sadm_files/21025539310.pdfIn PDF document text
    • http://nuitsdartistes.eu/images/file/wabenivasadige.pdfIn PDF document text
    • http://autosklo.sk/pictures/file/67014413430.pdfIn PDF document text
    • https://wroclawmodelshow.pl/ckfinder/userfiles/files/15207754644.pdfIn PDF document text
    • http://www.biharikft.hu/bihari-admin/ckfinder/userfiles/files/najajek.pdfIn PDF document text
    • https://speculatio.in/userfiles/file/62072108949.pdfIn PDF document text
    • http://usateatop.com/_upload/files/2619150356.pdfIn PDF document text
    • http://letresorellebio.it/userfiles/files/mafukameputetazageli.pdfIn PDF document text
    • http://women-for-marriage.com/ckfinder/userfiles/files/38716307463.pdfIn PDF document text
    • http://dancephoto.ru/userfiles/files/58424918947.pdfIn PDF document text
    • https://systematix.pl/userfiles/file/jadojopijilix.pdfIn PDF document text
    • https://burkina-businessschool.com/business_school/uploads/file/vabukuwuferodika.pdfIn PDF document text
    • http://suchanekstomatolog.pl/files/file/14743696690.pdfIn PDF document text
    • http://condominiobrisasdelnorte.com/userfiles/file/72998834118.pdfIn PDF document text
    • http://www.hkimm.hk/_bin/ckfinder/userfiles/files/lakovisan.pdfIn PDF document text
    • http://admio.ru/wp-content/plugins/formcraft/file-upload/server/content/files/161451eb42fd39---43623775979.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=dota+2+anime+modPDF 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_off0000d600.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD600 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ee17.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE17 10216 bytes
SHA-256: 93a41db29a7945aea557b6f5d61c3578b7f7b1f551eccf17f9f10b74aa740947
font_02_sfnt_off00010502.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10502 16260 bytes
SHA-256: cb5703d50d034d42e09fe6469cc740c6fbe5ba9d5d0337422b8bba838a82c3a2