Malicious PDF — malware analysis report

Static analysis result for SHA-256 c83070a78804317f…

MALICIOUS

PDF

101.2 KB Created: 2021-07-30 01:11:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 03ce6dcc2ea57a0bab300dbd471dad91 SHA-1: 1218e2be2d2bdd522b8ed76ad678a94bd56d6af8 SHA-256: c83070a78804317fce6bece4f9707726c2334f88efc6a8a67bae71b36c1f01d1
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics as malicious, including a ML classifier and ClamAV. It contains a link farm pointing to numerous distinct hosts, many of which appear to be compromised WordPress sites or disposable hosting. The embedded URLs suggest an attempt to direct users to potentially malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9909

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://tantex.org/tantex/tantexuserfiles/file/naworewewatimuridusuputa.pdf In PDF document text
    • https://roadtoring.com/wp-content/plugins/super-forms/uploads/php/files/0671220feb88135db2ed9a1b894b6574/gakoxazamogamimavesut.pdfIn PDF document text
    • https://givemeit.ru/wp-content/plugins/super-forms/uploads/php/files/bc7a695fc3b81f26c49d184484f9c4f4/barunaxakugujanu.pdfIn PDF document text
    • https://welltowork.org/wp-content/plugins/super-forms/uploads/php/files/fdf5a774e0a4272ef08fa4d252d0dfd7/muraxofaduxesujigolu.pdfIn PDF document text
    • http://mas.vacations/wp-content/plugins/formcraft/file-upload/server/content/files/160982e7976fd0---16648368013.pdfIn PDF document text
    • http://www.cheapmotorcycleinsurancepa.com/wp-content/plugins/super-forms/uploads/php/files/vmg85ee1t81sg7obdd9aq0ajb0/18771040429.pdfIn PDF document text
    • http://botanicgardenscafe.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16086eddb9f6e1---zolatib.pdfIn PDF document text
    • https://dermatologie-chamonix.com/userfiles/file/pogovova.pdfIn PDF document text
    • https://www.certificagreen.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075dd2ac4770---69991585103.pdfIn PDF document text
    • http://picart-personal.pl/fckupload/upload/file/67114984894.pdfIn PDF document text
    • http://jarosi.hu/files/file/61334477273.pdfIn PDF document text
    • http://hkacca.com/userfiles/kunok.pdfIn PDF document text
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/lodaf5cr7t91f6j2e7dlfkki74/15377167270.pdfIn PDF document text
    • http://rufullthrottle.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d070de6081---27325307326.pdfIn PDF document text
    • https://vakukh.ru/wp-content/plugins/super-forms/uploads/php/files/31bbb4fa07c98327aaaa4bf209f9e611/lokizem.pdfIn PDF document text
    • http://www.meglobalinc.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160a20729add1e---badosenaxivogu.pdfIn PDF document text
    • http://zartmobilia.com/userfiles/file/20210630042542.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/160960b1446fa5---72803230098.pdfIn PDF document text
    • https://glasschneider.koeln/wp-content/plugins/super-forms/uploads/php/files/5gj3d7n3t8u4ajj2qre2egl4q2/68714284519.pdfIn PDF document text
    • http://eduomania.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d5cdf816df---35878706647.pdfIn PDF document text
    • https://aguiapromocional.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16075bf1644f20---sebozamadovupojurav.pdfIn PDF document text
    • https://cashmeredreams.com/wp-content/plugins/super-forms/uploads/php/files/8b19f03bc032254b2d264967808de598/zufipegemaruranowemaromi.pdfIn PDF document text
    • http://kotolantopeni.cz/file/kopeval.pdfIn PDF document text
    • http://madiran-cruduparadis.fr/ckfinder/userfiles/files/88571475021.pdfIn PDF document text
    • https://yastudio.net/wp-content/plugins/super-forms/uploads/php/files/94f286542882e693198c1dd933c76719/3967250197.pdfIn PDF document text
    • http://zhengfutz.com/v15/Upload/file/2021741025358797.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=the+master+key+to+wealth+pdf+downloadPDF 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_off0001269c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1269C 10924 bytes
SHA-256: f34c230dca7f76867b2642b5c6039d06c712d92af3354ea47a998afc1f56501b
font_01_sfnt_off00013fdb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13FDB 16968 bytes
SHA-256: d62b4f211edc6e56e0093123e71a587d77bcdc24ae1ab628a337a06dca47626e
font_02_sfnt_off00016c20.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16C20 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1