Malicious PDF — malware analysis report

Static analysis result for SHA-256 e2fde8ed6db29737…

MALICIOUS

PDF

86.1 KB Created: 2021-06-26 16:30:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 4f918974187c87fccb8488213517de89 SHA-1: 07e51ea2c3d4509957d3043c20273aa7aa046ae6 SHA-256: e2fde8ed6db29737babc7f487f762a5b9bb1ca62baf4f286cf71acb344fb9ec9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to disposable hosting or compromised CMS upload directories, indicative of a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://sad-azov.ru/wp-content/plugins/super-forms/uploads/php/files/ce5499695dbada85a6c74b1b49ea2d62/vumowasisoji.pdf
    • https://www.proctoloji.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607046e48b834---pofilezebevudajowafon.pdf
    • http://modelkyujin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160771dc97f21b---jotibavirakune.pdf
    • http://boxerdapolenta.com/cmsimple/images/file/13368624238.pdf
    • http://barrarioservicos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606c952ba9d85---basasadojuverajugidig.pdf
    • https://yourtuscanyguide.com/wp-content/plugins/super-forms/uploads/php/files/0fofnhp52l6kui3dbm341q7b04/18877775468.pdf
    • https://www.northwoodmedical.ca/wp-content/plugins/super-forms/uploads/php/files/vfnatmmq6i5b8qh6t9ufknc2jr/xizex.pdf
    • http://gtlmarinefuel.com/userfiles/file/fesorojetozoxasum.pdf
    • https://ankaratemizlikcim.com/depo/sayfaresim/file/pipurexofi.pdf
    • http://stroynerud-sm.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160c1b8c885e81---77591293262.pdf
    • http://evabody.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607a0152244db---4562962744.pdf
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/365ccd35ba8404a61348688d2a05dd88/dajoriripejapasa.pdf
    • http://jjmcp.jp/userfiles/Image/file/16750013401.pdf
    • http://recruiters-zone.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094b8595a7f1---19634627506.pdf
    • http://yatros.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607df034a6f4b---junato.pdf
    • http://opusincertum.it/userfiles/files/neneribanogobaginoviv.pdf
    • https://prsnashville.com/wp-content/plugins/super-forms/uploads/php/files/c594df814a6b6c10011fe57399dc7b66/raxabujegefetigo.pdf
    • https://wscnaturalhealings.com/wp-content/plugins/super-forms/uploads/php/files/75b78fe32e87350732c8dba4016d3a8c/vosemes.pdf
    • http://www.apsetedavisi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070ea3b6d213---gubamogajema.pdf
    • https://vivaldiroberto.com/img/files/mediafiles/file/furipu.pdf
    • http://alexanderkanevskyartgallery.com/clientMedia/file/roriwebilunadovove.pdf
    • https://www.grecosalesinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ce02aa9324e---62484831726.pdf
    • https://engravestone.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607782ee0f074---9544424345.pdf
    • http://audiomaster.se/wp-content/plugins/formcraft/file-upload/server/content/files/1607c5e16bf8a3---pujelobodumoxo.pdf
    • http://narcisse.sk/editor_uploads/files/31442545107.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=direct+and+indirect+questions+worksheets
    • 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_off0000eb71.bin
909788f299003d3eb41c7a3e863fd256636fd3e58e035198d227b84e4f3e69f1
pdf-font-stream PDF embedded font (sfnt) at offset 0xEB71 10848 bytes
font_01_sfnt_off0001044d.bin
2ccc6fcb8e436e12da9b91060d920da29782177eb802b6ff4aa3d1f2f799b79c
pdf-font-stream PDF embedded font (sfnt) at offset 0x1044D 17296 bytes
font_02_sfnt_off00013136.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13136 16792 bytes