Malicious PDF — malware analysis report

Static analysis result for SHA-256 4598f1321fd27d62…

MALICIOUS

PDF

95.4 KB Created: 2021-06-28 21:45:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 86df9aa38e42bc35e1dc0b8d2d788059 SHA-1: 172897a255c919a3732caf59fddf3fce16872ba5 SHA-256: 4598f1321fd27d620c9fdaae5a3a23a796be480bf4701fd4ac15cc43a9f684a9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm directing users to multiple URLs hosted on compromised CMS uploads, indicating a phishing or redirection attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to lead users to malicious content or further compromise. No scripts were extracted, but the structure and URL patterns are indicative of a phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9935

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 https://www.bountyvacation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609abc9d37106---91388854058.pdf
    • http://tea-ra.com/user_data/upload/save_image/files/lizezinajufuwidupojovaxog.pdf
    • https://alphacleanwashing.com/wp-content/plugins/super-forms/uploads/php/files/a3401ffea68db1e8cb398364382fa83f/pigavodarebokuw.pdf
    • https://www.olympusnorge.no/wp-content/plugins/super-forms/uploads/php/files/rc4ot1fkqqfu6pddomo74noc5o/52859368061.pdf
    • http://kfbi.ru/content/file/258399816.pdf
    • https://atolab.it/wp-content/plugins/super-forms/uploads/php/files/cf9456695b199a169850ab770d2ed5f7/65920253290.pdf
    • https://energooptima.hu/upload/File/19619966051.pdf
    • https://www.hediyevideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160799f539762f---70124720304.pdf
    • https://cvsc.co/userfiles/file/79085968758.pdf
    • http://www.kidnuri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d2ed5b9c7a---46506605468.pdf
    • https://www.getfitcrew.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c9fad8b0476---91870836119.pdf
    • http://www.ddd-iasi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160760b1b1c074---wiwab.pdf
    • https://al-wesam.com/userfiles/files/78691578412.pdf
    • https://www.fecomerciomg.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160ccdf9783d12---71965557035.pdf
    • https://aadhaarretail.com/administrator/imagetemp/file/jimelavi.pdf
    • http://bamila.vn/luutru/files/wigisowajejubuzonemixoj.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086720b97e40---meretakuwutiw.pdf
    • https://autosofortkauf.ch/wp-content/plugins/super-forms/uploads/php/files/t32948of7jvik5hkp4eb19v414/gimagewixivomu.pdf
    • https://aquariumfargo.com/wp-content/plugins/super-forms/uploads/php/files/bbaf0598145f8c0705a69c93573d8199/41102592582.pdf
    • https://turbooto.vn/upload/files/mimorosatemamuruvebiko.pdf
    • http://wakingbeauty.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089dc2a1ae79---gonemifix.pdf
    • https://bonpetsupply.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e5d7e16d4f---90580770548.pdf
    • http://asesoriagarpe.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc8ae139c46---mumawojunipenusezexinuz.pdf
    • https://elpmarketing.ca/wp-content/plugins/super-forms/uploads/php/files/70824951a2a6c57e3c72da8d6df0c9cd/sineloxixadewolimobulo.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=harry+potter+books+in+english+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_off00011077.bin
060ac49546ce230b6b0983712f08b56c50dbe0e3dc2be271adb076a9b91b3da8
pdf-font-stream PDF embedded font (sfnt) at offset 0x11077 11116 bytes
font_01_sfnt_off000129da.bin
0dfe8e7505684e85bb7e81c300005cd8da0364684e3f8094817ed23b7d577bcb
pdf-font-stream PDF embedded font (sfnt) at offset 0x129DA 17756 bytes
font_02_sfnt_off00015847.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x15847 16792 bytes