Malicious PDF — malware analysis report

Static analysis result for SHA-256 b20776a493d9d5f2…

MALICIOUS

PDF

86.1 KB Created: 2021-09-06 16:26:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 5e9ad35e6261ff7300110e638c3202a1 SHA-1: f071bbe94b6a6ad00d3fe5697d0888d97a8a6558 SHA-256: b20776a493d9d5f2adb6157c5edf5b74df695c5df210690f6764d908d8b91b15
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including ClamAV detecting it as a phishing trojan. It contains numerous embedded URLs that point to compromised websites and link farms, suggesting an attempt to redirect users to malicious content. The presence of these links and the overall structure indicate a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://krisoc.ru/uplcv?utm_term=divinity+original+sin+2+walkthrough+pdf+download PDF link annotation
    • https://www.mozartcantat.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16072e3937d0dd---tewub.pdfIn PDF document text
    • http://aivieksteslaivas.lv/userfiles/file/tonasamowafisoxa.pdfIn PDF document text
    • http://faceconnects.com/ci/userfiles/files/lapuxav.pdfIn PDF document text
    • https://www.uniqueartzz.com/wp-content/plugins/super-forms/uploads/php/files/66iaoa1tsehaorv4c51vni9jn7/dexazi.pdfIn PDF document text
    • http://polyalpan.hu/_user/file/jixop.pdfIn PDF document text
    • http://gd-weimi.com/upfolder/e/files/20210530010644.pdfIn PDF document text
    • https://studiogreenwich.ru/wp-content/plugins/super-forms/uploads/php/files/75d7f5e930f5aa65815fb33c052e4e6b/sopanaturorefebirasetoda.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a543546d85d---mogabivusodebod.pdfIn PDF document text
    • http://lapawan15.com/shop/fck_file/file/17432179774.pdfIn PDF document text
    • https://c4ir.ae/wp-content/plugins/super-forms/uploads/php/files/acfqgh4ldfml71jvjpbkcnksp2/77548481646.pdfIn PDF document text
    • http://studiosimonepantaleo.it/userfiles/files/setoxunekegalu.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609841134d749---17588306013.pdfIn PDF document text
    • https://carpanea.it/wp-content/plugins/super-forms/uploads/php/files/605a62484004e79394ef6b10335f5e76/52210687749.pdfIn PDF document text
    • https://markzone.az/wp-content/plugins/super-forms/uploads/php/files/js6kvkho5uaf1pnu91gbbkvteu/bijixerelif.pdfIn PDF document text
    • https://svetpoznaniyaonline.ru/wp-content/plugins/super-forms/uploads/php/files/16ff3da689a124ba8be19b9864fc3f72/53581543921.pdfIn PDF document text
    • https://angkalaris.com/contents//files/purozadutubupul.pdfIn PDF document text
    • https://adamant54.ru/userfiles/files/45082201826.pdfIn PDF document text
    • https://rmp-familienanzeigen.de/cms/files/79295386260.pdfIn PDF document text
    • http://domainecomps.com/documents/files/kewoloz.pdfIn PDF document text
    • http://brooklynsmokeshops.com/admin/images/file/gipujezeve.pdfIn PDF document text
    • http://fipjp.com/userfiles/file/77079697706.pdfIn PDF document text
    • http://weforyou.it/userfiles/files/gigadi.pdfIn PDF document text
    • http://aybar-gallery.com/userfiles/files/69217369467.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_off0000ec55.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC55 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010467.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10467 16924 bytes
SHA-256: 7e834e1af23cc3e22000c4637afce86afdfd1b8d921cad20f3f9a3506d7ffd9f
font_02_sfnt_off000130a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x130A8 11224 bytes
SHA-256: f8a3b157c9d4aa47bf69f692cdb01b51faca1ddce69ca0429b3c4ebce16dd7a5

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