Malicious PDF — malware analysis report

Static analysis result for SHA-256 aefc5dd60ad4a6b7…

MALICIOUS

PDF

81.1 KB Created: 2021-08-26 05:06:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-27
MD5: 6ace7387f32877a33bf5ebf3ff5077e0 SHA-1: e3ee0c369c54aa1435498d25a128a9e9c1b0d6a9 SHA-256: aefc5dd60ad4a6b7ce60f195a6f4f8be4fca2460d8ae41244487fdbd71e3d9e8
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a link farm with numerous URLs pointing to compromised CMS upload storage and disposable hosting. These links are likely intended to lead users to malicious sites for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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 http://sciattella.net/images/file/92348734273.pdf In PDF document text
    • http://bergfin.se/wp-content/plugins/formcraft/file-upload/server/content/files/160c9b3d3c08cb---wugorufegukigali.pdfIn PDF document text
    • http://i-daa-wl.de/userfiles/pifixexajuwimulave.pdfIn PDF document text
    • http://novussiteyonetimi.com/uploads/file/25380308599.pdfIn PDF document text
    • https://www.institutvzdelavani.cz/files/maroruzifuvofodolubivug.pdfIn PDF document text
    • https://villadorottya.hu/uploads/frontend/files/lejusajokizorekonebo.pdfIn PDF document text
    • https://ontime-taxi.kg/wp-content/plugins/super-forms/uploads/php/files/1a020bc09fb9b33ade1fe06572853599/8591215172.pdfIn PDF document text
    • https://fiambreszav.com/wp-content/plugins/super-forms/uploads/php/files/0ac49eab71d64f2cc5f5f0694802aab1/62782925029.pdfIn PDF document text
    • http://smartcookieacademy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073811c96b60---goliro.pdfIn PDF document text
    • https://www.tctnanotech.com/wp-content/plugins/super-forms/uploads/php/files/58a757dc60601160efb8de1b1a471c58/754231047.pdfIn PDF document text
    • http://averon.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160732a77be3de---76368337646.pdfIn PDF document text
    • https://tranduongauto.com/app/webroot/files/images/pages/files/2957617846.pdfIn PDF document text
    • https://stallion-international.com/userfiles/file/laligutufikirokokedixezuk.pdfIn PDF document text
    • https://www.histoiresdegroupes.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085ed464f9ab---jopipaponegekekek.pdfIn PDF document text
    • https://mgogs.com/mgfiles/file/bowuravosuxuxufijo.pdfIn PDF document text
    • http://goldenbaycruisesagent.com/userfiles/file/78001116214.pdfIn PDF document text
    • http://www.morrisjones.co.uk/EditorImages/file/2959826494.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dc935e72446---59691714856.pdfIn PDF document text
    • http://www.medicalalliedtraining.com/wp-content/plugins/formcraft/file-upload/server/content/files/161239db0b1d86---77853818424.pdfIn PDF document text
    • https://daulte.com/ckfinder/userfiles/files/41627399135.pdfIn PDF document text
    • https://www.sblending.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608718b6d333c---jaxusaja.pdfIn PDF document text
    • http://vivaldiroberto.com/img/files/mediafiles/file/51612243671.pdfIn PDF document text
    • http://www.191seo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075bdf24219c---88435769302.pdfIn PDF document text
    • https://www.diktu.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b475c85f10b---31727511113.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=the+devil+went+down+to+georgia+clone+heroPDF 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_off0000d8b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8B8 17580 bytes
SHA-256: 4b62b1c717c8ba75068240cc543eced69a1cab5caa23c2712dbf33d37761cb1e
font_01_sfnt_off00010653.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10653 10596 bytes
SHA-256: 6b7582d487da36874e96895cbc8fec6dddacd74fe9bc5595bcd28090b3e6a94c
font_02_sfnt_off00011e4e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E4E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1