Malicious PDF — malware analysis report

Static analysis result for SHA-256 8ffb9cffcbff4e5e…

MALICIOUS

PDF

88.7 KB Created: 2021-07-24 22:34:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: c7fca2f0984469cf51a566ab85c62941 SHA-1: 7f6ed865756f1bc615b1db4dc2b7f6a55e91c513 SHA-256: 8ffb9cffcbff4e5e1b633af6e1b47c3e552e4681e868151013b02201fc5de536
156 Risk Score

Malware Insights

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

This PDF file exhibits characteristics of a link farm, with numerous embedded URLs pointing to other PDF documents hosted on various websites. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and the presence of multiple links on potentially compromised CMS uploads suggest an attempt to manipulate search engine results or distribute further malicious content. ClamAV detection as 'Pdf.Phishing.Trojan-d2568dad23a94d95' further supports its malicious nature, likely serving as a lure or initial stage for a phishing or trojanized payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://fitviewer.biz/files/file/selim.pdf In PDF document text
    • http://koovappadyscb.com/ckfinder/userfiles/files/xugejabuvomukedosema.pdfIn PDF document text
    • https://sitebyside.ru/wp-content/plugins/super-forms/uploads/php/files/1a05c4cc54f513efc0a665db3f935c0d/97290034273.pdfIn PDF document text
    • http://www.tenniscanberra.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160d908b828e8a---fokeratotopimukuborodenak.pdfIn PDF document text
    • https://www.glasswindowequipment.com/wp-content/plugins/super-forms/uploads/php/files/c98769ce8f3c757fe1d08ed65e037af6/14189320606.pdfIn PDF document text
    • http://mnwebdesign.dk/userfiles/file/24875785943.pdfIn PDF document text
    • https://catherinehourihan.art/wp-content/plugins/super-forms/uploads/php/files/950745944c5ec56e821a3fcb7572c627/wobexi.pdfIn PDF document text
    • https://actorconseil.com/files/file/denemopekime.pdfIn PDF document text
    • https://brylka-kfz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160d520b78bf34---12367450205.pdfIn PDF document text
    • http://highendschmiede.de/highendfiles/file/lofesevipedi.pdfIn PDF document text
    • http://xn--80akij1ajew.xn--p1ai/wp-content/plugins/formcraft/file-upload/server/content/files/1607ebcfc38dc0---56492205399.pdfIn PDF document text
    • http://kazenergy.kz/wp-content/plugins/formcraft/file-upload/server/content/files/160aa8bc41ef7e---rivepujexali.pdfIn PDF document text
    • http://perfekttorun.pl/pliki/77855441353.pdfIn PDF document text
    • http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/7eblot36se4cp6r8gffaqjdu41/70873816003.pdfIn PDF document text
    • http://wenxuezj.com/images/File/labuxasazevavitefe.pdfIn PDF document text
    • https://dtcprojects.com.au/wp-content/plugins/super-forms/uploads/php/files/kqfdikprvrif5o92iknldf3i7d/52023870781.pdfIn PDF document text
    • http://lawcab.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1608df079d2e0e---buwamifawerilibig.pdfIn PDF document text
    • http://www.petersmetalstitching.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160d02b4272364---17579861039.pdfIn PDF document text
    • http://grupomarsamo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a792241b9e3---zowesuxebasumanurela.pdfIn PDF document text
    • http://poltinik.ru/userfiles/file/22570930459.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16078cffdaeeb2---solalep.pdfIn PDF document text
    • http://studiodrago.eu/userfiles/files/xipisonuzuzeda.pdfIn PDF document text
    • http://niszczeniewaw.pl/userfiles/file/14812711286.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=cfop+method+all+algorithms+pdfPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000edef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDEF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010606.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10606 10872 bytes
SHA-256: 59308cf3a987037ff523609011fe0dfcc17534429ee73af184c0bf55e92352ed
font_02_sfnt_off00011eee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EEE 17024 bytes
SHA-256: 7c83001ca7e2dab85c377a4f60e82e01b38afc662d23f842990acb19ea850be7
font_03_sfnt_off00014ba1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14BA1 1992 bytes
SHA-256: cd0cfac502e4ca6f2226d85c9141bcbc53c055c73572a03ac62bb6d1f6440fd5

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