Malicious PDF — malware analysis report

Static analysis result for SHA-256 cfae791de92ac5dc…

MALICIOUS

PDF

84.8 KB Created: 2021-08-19 06:06:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 8b6e75cd9acc320ef81bdf65a17f0544 SHA-1: d8ea6e968c2ff46a9d4e02f0b1e6201fb7149a7c SHA-256: cfae791de92ac5dc8a15f803557c18fe6329831861a14d4d1fbb3ff133864f9a
156 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to compromised WordPress sites and other disposable hosting. These links likely lead to phishing pages or further malware downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://infrive.ru/uplcv?utm_term=focus+t25+alpha+cardio+download+free
    • http://oprandi.it/userfiles/files/92522858097.pdf
    • http://theopenhouseclub.com/wp-content/plugins/super-forms/uploads/php/files/32fe2e850ef703b78c6c7b8cc3ef8fb4/38268341445.pdf
    • http://humanlitech.com/files/files/55488830403.pdf
    • https://www.certificagreen.com/wp-content/plugins/formcraft/file-upload/server/content/files/161051e4e42836---93188726584.pdf
    • https://limpjet.com.br/wp-content/plugins/super-forms/uploads/php/files/c445851c4d99adc5b57b5a72407bdb62/76066954389.pdf
    • https://roweryelectra.pl/app/webroot/uploads/file/16214490473174.pdf
    • https://mmrh.myagenda.cz/pictures/editor/files/sinuvafanasomavexeput.pdf
    • https://eminentland.com/admin/userfiles/files/25129059722.pdf
    • http://www.ellisrasbetonwerke.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16089862799195---digijasipuvodavezutoke.pdf
    • http://ophtalmic-overnight.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16079652751e00---nilorosafemibutatej.pdf
    • http://turagent007.ru/userfiles/file/kavisawufof.pdf
    • http://sciencevier.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dfaf4827aa1---12856422555.pdf
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607441d3d1a00.pdf
    • https://mimpisiluman.com/contents//files/ferapajosireladijotemuziv.pdf
    • http://tvoirostov.ru/ckfinder/userfiles/files/wifewukekutevadesufukos.pdf
    • http://remontnoedelo.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607446603270d---jujuzusatovi.pdf
    • https://mgrenginiai.lt/ckfinder/userfiles/files/25210341256.pdf
    • http://greenbrier101.com/userimages/fulafivuvagor.pdf
    • http://ankaser.com/userfiles/file/78049458874.pdf
    • http://thuexe7cho.vn/upload/files/miditefifodo.pdf
    • http://cedresarquitectura.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607487bbe0bc5---wusulikadazigumefoxaso.pdf
    • https://bnbtravels.com/ckfinder/userfiles/files/32176245507.pdf
    • https://menu2uplus.com/images/file/57493616791.pdf
    • 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_off0000e51e.bin
6eafef82dbc407cbd65c58d95abb5c8b4c9ddc88ca14edcdde9ceba8d77d1641
pdf-font-stream PDF embedded font (sfnt) at offset 0xE51E 11132 bytes
font_01_sfnt_off0000ff3a.bin
868665018078735c9def02c76e564282447d4744ca8b4426cffe7d3bf0003d87
pdf-font-stream PDF embedded font (sfnt) at offset 0xFF3A 17376 bytes
font_02_sfnt_off00012ce7.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12CE7 16792 bytes