Malicious PDF — malware analysis report

Static analysis result for SHA-256 703eb33edf719ee6…

MALICIOUS

PDF

80.6 KB Created: 2021-08-29 10:22:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: 8ef23d4692412116693a35b714908f9d SHA-1: b600e3dbdea5e24f763b718e6f86ed5a55457a52 SHA-256: 703eb33edf719ee62a8928ede56a6905be4d55dd48ed5009dee90d8999d6f281
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a link farm that directs users to multiple domains, many of which are hosted on compromised CMS uploads or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a malicious document designed to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9934

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.dentaltaxpros.com/wp-content/plugins/super-forms/uploads/php/files/7a7f02ecc4aa68df79069f4e8ef199a0/58890909704.pdf In PDF document text
    • http://waypl.pl/upload/File/dafibugawa.pdfIn PDF document text
    • http://www.realisthotel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081f18ec6ddd---13163549426.pdfIn PDF document text
    • http://ozdoby-betonowe21.pl/Upload/file/61572023299.pdfIn PDF document text
    • http://aroma-es.site/yamituki-n/uploads/files/fasazazuxejirubupeso.pdfIn PDF document text
    • http://top-conversion.ru/ckfinder/userfiles/files/ravepotatuliwobowipuvaxu.pdfIn PDF document text
    • https://gpagroup.in/wp-content/plugins/formcraft/file-upload/server/content/files/16075be93dfcc5---85882255856.pdfIn PDF document text
    • https://naucharts.com/ckfinder/userfiles/files/18185907990.pdfIn PDF document text
    • http://www.sempresaude.net/wp-content/plugins/formcraft/file-upload/server/content/files/16086dbe21af85---69631488959.pdfIn PDF document text
    • http://www.masozilina.sk/ckfinder/userfiles/files/3598999470.pdfIn PDF document text
    • https://synodradomski.pl/userfiles/file/vixopenifagejigud.pdfIn PDF document text
    • https://www.oasipizza.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a9625bf259c---18538368469.pdfIn PDF document text
    • http://asbazainville.org/userfiles/file/ronugugeminomufuwofokuzik.pdfIn PDF document text
    • http://ferrogep99.hu/static/media/file/17311324155.pdfIn PDF document text
    • https://grahampropertytax.com/wp-content/plugins/super-forms/uploads/php/files/505ac0f8618eda073a64818c36bad64f/zafavavoxorigelujaximekos.pdfIn PDF document text
    • https://przyklejki.pl/userfiles/mazowesorezekogarazisi.pdfIn PDF document text
    • http://multi-accueil.fr/ressource/site-image/files/gixonabonadon.pdfIn PDF document text
    • http://robertoantoniz.com/resources/original/file/80450054867.pdfIn PDF document text
    • https://businessincasey.com.au/application/third_party/ckfinder/userfiles/files/vimaxag.pdfIn PDF document text
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/e6fc220b7cc17f9245ae59cf771248da/86275293485.pdfIn PDF document text
    • http://ty-universe.com/image/files/20210601_035841.pdfIn PDF document text
    • http://gemwishrs.com/ckfinder/stones/files/mevoma.pdfIn PDF document text
    • http://paymentsbusiness.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1608cb4eb59297---bejusonunifoxufidabove.pdfIn PDF document text
    • http://phuvuongcorp.com/luutru/files/67298164604.pdfIn PDF document text
    • http://caribsplash.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609571e57e348---tebobago.pdfIn PDF document text
    • http://mvsexpo.ru/admin/ckfinder/userfiles/files/tapexubes.pdfIn PDF document text
    • http://world-green-hope.com/uploads/files/lumofuti.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=different+types+of+your+grammarPDF 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_off0000d605.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD605 10868 bytes
SHA-256: 45b5f50f9622c933ab36dc7e4e62c654af49eb839ce8c1ddd60a15b0beceba05
font_01_sfnt_off0000ef2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF2F 17196 bytes
SHA-256: 34e5ffc18a6c5599ceb3494edda2d45fa72e8128481ba0af34ca5560b7770ee9
font_02_sfnt_off00011bc3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BC3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1