Malicious PDF — malware analysis report

Static analysis result for SHA-256 219d4e86c1ccfa95…

MALICIOUS

PDF

77.3 KB Created: 2021-09-05 22:03:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 3656178b71a4b3ea1f488911af02d2e0 SHA-1: 5fc607adf7cb7006093ca18cef563a97095df45b SHA-256: 219d4e86c1ccfa954530f7a47be40f01036fd6984137354fcb5e33ee92294391
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was identified as malicious by a machine learning classifier and ClamAV. It functions as a link farm, directing users to multiple external websites, many of which are hosted on compromised CMS platforms or disposable domains. The embedded URLs suggest an attempt to distribute phishing content or further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://paramountswimwear.com/userfiles/files/46807198680.pdf In PDF document text
    • https://www.cibaospalaser.com/wp-content/plugins/super-forms/uploads/php/files/en8i0l0gndu5ef6djla00m8st3/dovulobamikino.pdfIn PDF document text
    • https://www.hed-endo.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160775186e2ea6---zitawamuwerejamunolita.pdfIn PDF document text
    • http://gildiamasterov.ru/userfiles/file/kejizotomidotibuled.pdfIn PDF document text
    • https://braviengenharia.com.br/wp-content/plugins/super-forms/uploads/php/files/o6vmp3oicrqg5v3tlnmebq2dg5/fegifazifogir.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/a2i6qb02ehlqdh4id8eri1k2rq/17174160555.pdfIn PDF document text
    • https://upbilbao.com/ckfinder/userfiles/files/17845777870.pdfIn PDF document text
    • http://thebankcardservices.com/uploads/files/firizezudoxuvu.pdfIn PDF document text
    • https://www.mysmilestudios.com/wp-content/plugins/super-forms/uploads/php/files/3f4c9c762848c86946e11cc55c9a7075/letutipejoxojuwezis.pdfIn PDF document text
    • https://www.darrellstuckey.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d629a620357---tubodazidunaxexumixikife.pdfIn PDF document text
    • https://avgdesign.com/userfiles/file/94385746860.pdfIn PDF document text
    • http://sinara.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160751bde241ea---60508768840.pdfIn PDF document text
    • http://modelkyujin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab075c9df34---30856377066.pdfIn PDF document text
    • https://tcufroghouses.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071cde3705ae---vifebaz.pdfIn PDF document text
    • https://inverpalmas.com/aym_image/files/tisupomejewemilegu.pdfIn PDF document text
    • https://www.albispanaderia.com/wp-content/plugins/super-forms/uploads/php/files/19a4c6dfd78cf02890fcee03ef462ce4/xanalojex.pdfIn PDF document text
    • https://avvocatoboretti.it/file/53380134860.pdfIn PDF document text
    • http://distributoram.com/files/file/477964435.pdfIn PDF document text
    • https://htchninc.com/d/files/93662480787.pdfIn PDF document text
    • http://www.annaleehuber.com/content_files/file/palenixelazemigisutis.pdfIn PDF document text
    • http://sxsasa.org/images_fck/file/1628675972.pdfIn PDF document text
    • http://braciszewska-klimek.pl/fck_files/file/41136310762.pdfIn PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/11jfk0fgu54msl5rmhdk43ruc7/wadorisiropowida.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=solving+radical+equations+practice+worksheet+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_off0000c945.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC945 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e157.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE157 17208 bytes
SHA-256: ac4763e16c8ca39eb275a4db637bd021ae60dfff4ff3c6619aeed24dec443466
font_02_sfnt_off00010d2b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D2B 11360 bytes
SHA-256: 2bef594062fc9a89546f95f2b8fcb542dddcc8956e35d7e4ae1c2a797e360a53