Malicious PDF — malware analysis report

Static analysis result for SHA-256 99105596259aaf3b…

MALICIOUS

PDF

85.7 KB Created: 2021-09-01 17:02:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 4ce9a894afa063c141e725fa4059da77 SHA-1: 158121bf8fa1c0224f2f9a9e0a2f6a7ddb038620 SHA-256: 99105596259aaf3bcf6be9e64479e71b873560a43484a62020098813f19f7022
156 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded URLs, many of which point to compromised websites hosting other PDF files. This structure is indicative of a link farm designed to distribute malicious content or facilitate phishing attacks. The ClamAV detection and ML classifier strongly support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://yarsan.ru/wp-content/plugins/super-forms/uploads/php/files/61c15143769e988ba864bacf73277633/37281197481.pdf In PDF document text
    • http://usarsenal.it/userfiles/files/64195148171.pdfIn PDF document text
    • http://zzquansu.cn/d/files/vodotivomukixivatotexuf.pdfIn PDF document text
    • https://lightingsystemscol.com/wp-content/plugins/super-forms/uploads/php/files/a8c12ce3bc2d6a022aee36e69956b8d7/70379394196.pdfIn PDF document text
    • http://saltokisport.com/uploads/files/21821619473.pdfIn PDF document text
    • http://bjsprt.com/uploadfile/file///2021051920033117.pdfIn PDF document text
    • http://suncitygroup.ir/basefile/suncitygroupir/files/26925076447.pdfIn PDF document text
    • http://distributoram.com/files/file/piwawudanidesejusavinera.pdfIn PDF document text
    • https://www.intermediastudios.com.mx/wp-content/plugins/super-forms/uploads/php/files/e23ffadc7821a29553ef11b8b618e521/76043630898.pdfIn PDF document text
    • http://cerezolorente.com/files/cerezolorente/_repo/file/tisuxokitunoka.pdfIn PDF document text
    • https://realimpacto.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16103a92951a7b---84253915878.pdfIn PDF document text
    • https://yingzhaoliuart.com/upload/file/61097661525.pdfIn PDF document text
    • http://mosjob.ru/images/file/zagefexatopovipizegemetup.pdfIn PDF document text
    • https://archltginc.com/wp-content/plugins/super-forms/uploads/php/files/b37c8faf1cf2c0a0975450c8a745bc2f/rikevobixumodusanelizew.pdfIn PDF document text
    • https://www.karavanlakesfet.com/wp-content/plugins/super-forms/uploads/php/files/9b7203f3aab4f0e3763eb72f0ecd4f15/dawiwazibejurodinepi.pdfIn PDF document text
    • http://leoclubmarsala.it/userfiles/files/jijujakavizugagulura.pdfIn PDF document text
    • https://thekolkatapackersmovers.com/ckfinder/userfiles/files/87366443842.pdfIn PDF document text
    • http://barcabianca.eu/upload/file/80029518490.pdfIn PDF document text
    • http://geology.ie/wp-content/plugins/formcraft/file-upload/server/content/files/160794eca664d9---jiwisosikit.pdfIn PDF document text
    • https://www.alarisusallc.com/wp-content/plugins/super-forms/uploads/php/files/e8c245f1bbe032718d1743d9ec8b567b/78092494077.pdfIn PDF document text
    • https://pachetedeturism.ro/images/files/34915373224.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=hdd+led+cable+motherboardPDF 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ead7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAD7 17752 bytes
SHA-256: 6b74a0a41a5ecf3726b34727d907015e031c4ce14edecdffa41e972ff4d16743
font_01_sfnt_off000118ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118EE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013105.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13105 10404 bytes
SHA-256: 5a52419222e6f8f2ee1340f0ac6ed74c7285557151ce27d608e80c45ab36542f

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