Malicious PDF — malware analysis report

Static analysis result for SHA-256 53b4af43e9d9972b…

MALICIOUS

PDF

85.7 KB Created: 2021-07-03 14:59:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: e3a8986253fd8ae4d93294878e2f676d SHA-1: 12c21961ee4b5735d2683054c90892a28a332cb0 SHA-256: 53b4af43e9d9972b0ab026cdaee522b348ccfca4bb19e054fe9f3e5e65e4a264
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 containing a link farm pointing to compromised CMS upload storage. The ML classifier and ClamAV also identified it as malicious. The presence of numerous URLs, many hosted on potentially disposable domains or compromised sites, strongly suggests a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9860

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://dangeloremodeling.com/nbloom/fckuploads/file/46340199215.pdf
    • http://1970fchs50thclassreunion.com/clients/1/19/19770213778af891f1b13fa25f964f50/File/9483524900.pdf
    • https://sketchup360.vn/wp-content/plugins/super-forms/uploads/php/files/0dmg67g618uhc982092n9eoq0r/78055124685.pdf
    • https://bindazzled.com.au/wp-content/plugins/super-forms/uploads/php/files/92f03b88065c5eb99a437db65a04b095/88600254542.pdf
    • https://blindnow.com/userfiles/file/kozezuko.pdf
    • http://www.primalegal.eu/wp-content/plugins/super-forms/uploads/php/files/dngr7rd0ktibdrvl3l5eaqc3p7/xagasadox.pdf
    • http://www.gunyagder.org.tr/wp-content/plugins/super-forms/uploads/php/files/gj8rovo7q1la1gpd2dndk8cmo2/13085808512.pdf
    • http://scissortailfarms.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078fc088d288---18783483605.pdf
    • https://na-nule.ru/wp-content/plugins/super-forms/uploads/php/files/v1pib6r9acj1iuim05c46dk561/lalipaluko.pdf
    • http://imcborivali.org/userfiles/file/gupoxololulodojerevexizil.pdf
    • http://bsbcarpet.com/userfiles/file/nogavez.pdf
    • http://provia-events.de/pics/fotos/1/file/vujujirozirimonaxux.pdf
    • https://cullinanconstruction.com/wp-content/plugins/super-forms/uploads/php/files/7741qp1b28c6fn67kfs7326pjd/86103909215.pdf
    • http://crystalnymph.by/wp-content/plugins/super-forms/uploads/php/files/def0f1f84470c62178b0501484029f6b/17019957902.pdf
    • http://podushka.by/files/files/rokisugewukar.pdf
    • http://www.ellisrasbetonwerke.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160becd94cec8d---49052545721.pdf
    • http://www.doctor-carpet.com/wp-content/plugins/super-forms/uploads/php/files/nkrcfc4sr25isvbe52bemrhsq0/18349143532.pdf
    • http://videoacceso.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bad9e601cf6---24562015080.pdf
    • http://wbbray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b4dfc16a913---30308015672.pdf
    • http://famcareconnect.org/wp-content/plugins/formcraft/file-upload/server/content/files/16084284b4a98d---66764677675.pdf
    • http://www.photobreak.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607901fc4b746---57882978042.pdf
    • https://glass-haus.ru/wp-content/plugins/super-forms/uploads/php/files/de58ba089144e057a41645a30ff2efb9/gozegasimasexiximifaxipu.pdf
    • https://xn----7sbabak5acz7byau.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/73d05705df359ee3311d3cbfdee98e86/jujaxuvixugenukodewata.pdf
    • http://www.pianoszimmermann.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609e3a67888f5---17696745993.pdf
    • http://geologocarmignani.com/userfiles/files/54636669370.pdf
    • https://dixietemporarystorage.com/wp-content/plugins/super-forms/uploads/php/files/58e31ad9b081d9483f1cceafbf279680/kokovetakuv.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=disability+rights+act
    • 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_off0000ecca.bin
e65584923888a592ed632ac12112848f32d77d47e3e593c0dd0338a0616f21c5
pdf-font-stream PDF embedded font (sfnt) at offset 0xECCA 17240 bytes
font_01_sfnt_off000119fa.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x119FA 16792 bytes
font_02_sfnt_off00013211.bin
5d23a3cdcbcf5c5d6899927ccb738fdfc0e762dcd25ca83e4d08a2290aaad41d
pdf-font-stream PDF embedded font (sfnt) at offset 0x13211 10408 bytes