Malicious PDF — malware analysis report

Static analysis result for SHA-256 bb7bc525b29087a4…

MALICIOUS

PDF

82.0 KB Created: 2021-09-03 01:34:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 8335ecf857dd1df71970cfee110c5eb9 SHA-1: 37180117dacdb470992a576995e31ab9c5ce1152 SHA-256: bb7bc525b29087a445dc3d5ba863aab24d70410b2f493c845abb0065e1d9caf9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file is identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, directing users to various external URLs, some of which are hosted on compromised WordPress sites. The presence of multiple distinct hosts and the use of UTM parameters suggest an attempt to distribute malicious content or phish for information under the guise of providing downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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://crewmak.ru/uplcv?utm_term=panchayat+secretary+digital+assistant+books+pdf+free+download PDF link annotation
    • http://cherryontop.pl/upload/fotki/file/zijiwaxejikusedexuso.pdfIn PDF document text
    • http://tauroconsulting.pl/userfiles/file/wekegonojevemezafedevo.pdfIn PDF document text
    • http://www.circoloaletrium.it/wp-content/plugins/formcraft/file-upload/server/content/files/160aa7cddf0002---87858833837.pdfIn PDF document text
    • http://salukool.ee/upload/userfiles/file/51780991580.pdfIn PDF document text
    • http://ks4073.com/file_media/file_image/file/72072145524.pdfIn PDF document text
    • https://hartwellcook.com/wp-content/plugins/super-forms/uploads/php/files/7b7444edeb7ba9cb92c5a6b96cb4b0b1/2807792306.pdfIn PDF document text
    • https://indacphuc.com/wp-content/plugins/super-forms/uploads/php/files/q2ju36c447inetoq3b0eqlupbo/8030917314.pdfIn PDF document text
    • https://www.energetisch-therapeut-estie.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c705b5d0a09---jorekowupodutatolezaj.pdfIn PDF document text
    • http://happyland-nsk.net/ckfinder/userfiles/files/sudupazatijasezib.pdfIn PDF document text
    • http://ecovn.vn/uploads/news_file/46937343643.pdfIn PDF document text
    • https://nic-irq.com/userfiles/files/19123101366.pdfIn PDF document text
    • https://cutletsmeat.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a47806e20d---bopuvemidobomunefo.pdfIn PDF document text
    • http://www.advokat.com/app/webroot/img/fck/file/xekamitumaxi.pdfIn PDF document text
    • https://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/1f439eaf162e19954079271861640d46/37894593658.pdfIn PDF document text
    • http://dc-536514926e84.632.ch/ckfinder/userfiles/files/98322056727.pdfIn PDF document text
    • https://theurbanthinktank.com/files/kirizenejugezutowurekamuf.pdfIn PDF document text
    • https://marksiegeldds.com/wp-content/plugins/super-forms/uploads/php/files/047b35b55333915b920fcdaed354995e/60836679792.pdfIn PDF document text
    • https://dorfadvertising.com/ckfinder/userfiles/files/guwisevigatetezese.pdfIn PDF document text
    • http://wsp.pl/userfiles/file/78424431491.pdfIn PDF document text
    • https://portsidestrategies.com/wp-content/plugins/super-forms/uploads/php/files/0db2d2245246132d7fbe417ba884ae09/dojetanin.pdfIn PDF document text
    • http://ballard1966.com/clients/22636/File/75213717892.pdfIn PDF document text
    • http://www.nanodrywash.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a67bdebc0c---sabasupebuposupokid.pdfIn PDF document text
    • http://www.immiflex.com/wp-content/plugins/formcraft/file-upload/server/content/files/160acdc4058abb---zivowokulunikoku.pdfIn PDF document text
    • https://selectwifi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cec203febf---93768587112.pdfIn PDF document text
    • http://anhbanglaw.com/userfiles/file/39958041054.pdfIn PDF document text
    • http://qazaqbanki.kz/data/content/files/85567606424.pdfIn PDF document text
    • 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_off0000d902.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD902 17900 bytes
SHA-256: d84a989c8f1578ebdc603660f38b8d0044bdb25c394fd89f77c8248427e08e51
font_01_sfnt_off000107b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107B1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011fc8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FC8 11332 bytes
SHA-256: 7ac13f5e835b182f335d5b6334505dc954ee8a5a115234340bcff9e0fcec9449