Malicious PDF — malware analysis report

Static analysis result for SHA-256 9d7e7ffcc4d93960…

MALICIOUS

PDF

86.7 KB Created: 2021-07-31 01:48:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 8e9ff72f5b408035aa8b4e3952f4903d SHA-1: abfa1b6b00512982e22d1205df76a8c697793d98 SHA-256: 9d7e7ffcc4d93960bb4a756b653757166e1025d1828382f37b0a3528facecbfd
156 Risk Score

Malware Insights

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

The PDF document contains numerous embedded URLs, many of which point to compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent. The primary function appears to be acting as a link farm, likely to manipulate search engine rankings or direct users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://medvor.ru/uplcv?utm_term=2004+polaris+ranger+500+6x6+service+manual PDF link annotation
    • https://wulf-sanitaer.de/wp-content/plugins/super-forms/uploads/php/files/1l7ln0l0kaq5cfkoqrsdom6bk9/86342813985.pdfIn PDF document text
    • https://soechi.com/userfiles/file/56988475242.pdfIn PDF document text
    • https://girilawfirm.com/content_files/files/8423731609.pdfIn PDF document text
    • http://macierz-grodziec.org/files/file/mesawonibedumogado.pdfIn PDF document text
    • https://akarchlight.com/wp-content/plugins/super-forms/uploads/php/files/c8637cebf0e19ea83c3e3cbb1cc00a68/damaratowavuzolisapupez.pdfIn PDF document text
    • https://www.businesswatchguardingservices.co.uk/wp-content/plugins/super-forms/uploads/php/files/d40c9g8u10vio60ftvfjjtdscr/tefazaponikebivasap.pdfIn PDF document text
    • http://designpavelzapletal.cz/files/file/51102609227.pdfIn PDF document text
    • https://limpjet.com.br/wp-content/plugins/super-forms/uploads/php/files/c486de6e36b202b957f474fabe2dac72/migorovibejawunupoma.pdfIn PDF document text
    • https://gpuhub.net/wp-content/plugins/super-forms/uploads/php/files/pmb0lakf5fld6bednatc7v6spf/97575137935.pdfIn PDF document text
    • https://antoinepanau.com/wp-content/plugins/super-forms/uploads/php/files/bb6cbba82e9be4a8dd816185b6f7ab74/5756405300.pdfIn PDF document text
    • https://amd-export.com/site/upload/file/87659376387.pdfIn PDF document text
    • http://biancoacolori.it/userfiles/files/94181215190.pdfIn PDF document text
    • https://luminex.pl/upload/file/ruwokeviruwewazugavan.pdfIn PDF document text
    • http://computerdoki.hu/user/file/68573027098.pdfIn PDF document text
    • http://psychoterapia-przemysl.net/img/userfiles/file/61370927207.pdfIn PDF document text
    • https://dailyiat.com/html_upload/file/lemasigasexuxinunabe.pdfIn PDF document text
    • https://www.hadlowsecurityshutters.com/wp-content/plugins/super-forms/uploads/php/files/76f07b424e05edf4be5a3fccca0aeac0/jeluvusexupamaj.pdfIn PDF document text
    • https://channeloflove.com/ckfinder/userfiles/files/defefozizupenavezowaj.pdfIn PDF document text
    • http://precedent.by/_newsite/images_from_html_editor/file/5011602203.pdfIn PDF document text
    • https://parfumzone.ro/files/file/92859187498.pdfIn PDF document text
    • https://www.audioclinica.pt/wp-content/plugins/super-forms/uploads/php/files/oubardg7dp6p8spddvsqholn0g/tuzofijinuxode.pdfIn PDF document text
    • 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_off0000ea49.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA49 11412 bytes
SHA-256: c54f1ec2549c1f3430437adc046d4104834ccba8278ded76fc0032780a839174
font_01_sfnt_off00010554.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10554 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011d66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D66 17832 bytes
SHA-256: 08aa416c7c815593f400b68ad6ef6296f3d11c1f92b9ba27860c1e24a6ceafee