Malicious PDF — malware analysis report

Static analysis result for SHA-256 36606d07b31e3d8a…

MALICIOUS

PDF

73.7 KB Created: 2021-07-19 03:44:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 4ff494b80e19237a2ec5790da5fb05d4 SHA-1: d1233568b19549b6f12df2acbf4c1106ba8a1808 SHA-256: 36606d07b31e3d8a64a2bac6c8abff09af2df19c130785a6bda64352d6bbe6c2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF was flagged by multiple heuristics as malicious, including a ClamAV detection for 'Pdf.Phishing.Trojan'. It functions as a link farm, with numerous URLs pointing to potentially compromised websites or disposable hosting. The ML classifier also strongly indicated maliciousness. The primary attack pattern involves directing users to external resources, likely for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9885

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://se-ty.ru/uploads/userfiles/file/tepuwutibujuliwus.pdf In PDF document text
    • https://energooptima.hu/upload/File/72502485220.pdfIn PDF document text
    • https://prosegik.com/wp-content/plugins/super-forms/uploads/php/files/d1ec7260bc3a6ecedfcf2c709637d2f7/rafetegarineze.pdfIn PDF document text
    • http://bhk-aindling.de/userfiles/files/81392592903.pdfIn PDF document text
    • https://pointsourcegroup.com/wp-content/plugins/super-forms/uploads/php/files/f362d9494cce951fa2256a61b8229066/fewagiwaxefunupitisoje.pdfIn PDF document text
    • http://pro-elec.ru/ckfinder/userfiles/files/31857504315.pdfIn PDF document text
    • http://www.impactit.in/ckfinder/userfiles/files/86562059951.pdfIn PDF document text
    • https://www.autodepotperformancegroup.ca/wp-content/plugins/super-forms/uploads/php/files/8fcgc5evds4fpkpg3lfnmaag6n/pamidurobeput.pdfIn PDF document text
    • http://championshipsportsrings.com/clients/23492/File/gopatosorez.pdfIn PDF document text
    • https://bednidhitraders.com/userfiles/file/xiwadudowufulivaxuzazi.pdfIn PDF document text
    • http://dieta-plus.pl/userfiles/file/panedubafo.pdfIn PDF document text
    • http://xn--szabowski-tub.pl/userfiles/file/wemas.pdfIn PDF document text
    • http://www.molinoag.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f40a3aa589---72250827166.pdfIn PDF document text
    • http://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e0646a41d2---66253835131.pdfIn PDF document text
    • http://indiebookoftheday.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e7323bd2203---dotokidokugibexetogej.pdfIn PDF document text
    • http://dmn.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16098392bd121a---sokimagukalakadezeso.pdfIn PDF document text
    • https://digireg.nu/upload/zilumene.pdfIn PDF document text
    • http://aiaato.com/FileData/ckfinder/files/20210611_3816D4C574011C4C.pdfIn PDF document text
    • http://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8be9dbc10f---33661273249.pdfIn PDF document text
    • http://ersatzmonitor.de/userfiles/file/46632008702.pdfIn PDF document text
    • https://psg66.ru/admin/ckfinder/userfiles/files/77296430369.pdfIn PDF document text
    • https://www.lumisolar.pe/wp-content/plugins/formcraft/file-upload/server/content/files/1607116db61def---21747792362.pdfIn PDF document text
    • http://www.empresasdelimpeza.info/wp-content/plugins/formcraft/file-upload/server/content/files/1607611b548f1e---wujabobuvajulage.pdfIn PDF document text
    • https://agribusiness.pk/wp-content/plugins/formcraft/file-upload/server/content/files/1607edf74d6866---46332727889.pdfIn PDF document text
    • https://vivaldiroberto.com/img/files/mediafiles/file/baxumujiwejiwokazebifa.pdfIn PDF document text
    • https://monarchwinemerchants.com/wp-content/plugins/super-forms/uploads/php/files/30abd065fa118eb7ae79915e1a5076f9/gojowijusovubez.pdfIn PDF document text
    • http://mas.vacations/wp-content/plugins/formcraft/file-upload/server/content/files/160be542a5d8d7---2367876621.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=chemistry+2008+hsc+answersPDF 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_off0000bcaa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBCAA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d4c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4C1 11012 bytes
SHA-256: 9e8f63ddd0e74b6f352baa2ef32928b2ba9f32418ce30acd7cafe4dc250dcc5b
font_02_sfnt_off0000ee5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE5E 16932 bytes
SHA-256: 880a9f5c6043a4b005f84fd260f732ec35d6a1f2e5bf29d8ce77c1274840264f

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