Malicious PDF — malware analysis report

Static analysis result for SHA-256 4464f280ae754d51…

MALICIOUS

PDF

83.3 KB Created: 2021-08-17 04:52:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 84a8aa80be9994df7fb7656a6eca5d8b SHA-1: e7859d4dc3f937f7cf0c2ab8e35071a99686a3ab SHA-256: 4464f280ae754d51ed84070a9640fe78b5fb1b874e79ddb4a82d2664ffe09009
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of links pointing to various domains, many of which appear to be compromised WordPress sites used for hosting files. The ML classifier strongly indicated maliciousness, and the link farm structure suggests an attempt to manipulate search engine results or redirect users to malicious content. No scripts were extracted, but the PDF structure itself is indicative of a malicious link farm.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9983

Heuristics 5

  • 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://la-klamm.org/userfiles/file/levinojavaweletawedamozin.pdf In PDF document text
    • https://banerjeetourspecial.in/ckfinder/userfiles/files/13122067594.pdfIn PDF document text
    • https://nikosdimos.gr/userfiles/file/57408974263.pdfIn PDF document text
    • http://triumphtoday.org/wp-content/plugins/formcraft/file-upload/server/content/files/160807d3a8fab0---tufonozufogeluje.pdfIn PDF document text
    • https://www.cdscabling.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607165c380758---mojatejuvekikez.pdfIn PDF document text
    • http://www.sbawerribee.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160b24187ce8a2---wusujutilizarejuzipi.pdfIn PDF document text
    • http://www.qookspot.kitchen/wp-content/plugins/formcraft/file-upload/server/content/files/160787d565f934---jowotak.pdfIn PDF document text
    • http://miroslaws.com/ckfinder/userfiles/files/94078586090.pdfIn PDF document text
    • http://colorfusion.us/admin/images/file/52578165319.pdfIn PDF document text
    • http://ceramvetro.net/userfiles/file/53350790935.pdfIn PDF document text
    • https://angkortaxiservice.com/userfiles/file/67384958488.pdfIn PDF document text
    • https://karapinarinsaat.net/userfiles/upload/file/10874473567.pdfIn PDF document text
    • http://www.peopleoftheheath.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fc42d96a36---83737373675.pdfIn PDF document text
    • https://www.conkite.com/wp-content/plugins/super-forms/uploads/php/files/83a85faa520c4473f0b34851e501e47b/mumumivufalajaluledoxe.pdfIn PDF document text
    • https://bettyloupaints.com/userfiles/files/20964030122.pdfIn PDF document text
    • http://marcobernini.it/userfiles/files/86181257854.pdfIn PDF document text
    • https://veaodaibrahma.com/uploads/image/files/vevejejirodi.pdfIn PDF document text
    • https://cedarcreeksauce.com/wp-content/plugins/super-forms/uploads/php/files/ce9df1c9327c3e9abe4563732d0a8cbe/tubitazatojilevuzevazofam.pdfIn PDF document text
    • http://ahs1968.com/clients/d/dc/dcea35c349c70fb55dca458fc6558ff6/File/votasakadi.pdfIn PDF document text
    • http://federicozucchettiarchitetto.eu/userfiles/files/bider.pdfIn PDF document text
    • http://www.yourhealthyourchoice.org/wp-content/plugins/formcraft/file-upload/server/content/files/160984e1fbb160---90319680802.pdfIn PDF document text
    • http://3handseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/160777fa30a0c1---povejetutolu.pdfIn PDF document text
    • https://derey.nl/app/webroot/files/userfiles/files/75377167352.pdfIn PDF document text
    • https://graffitipaintstudio.com/wp-content/plugins/super-forms/uploads/php/files/d49c11e4392d9b829427a47a72fe80a7/71705516685.pdfIn PDF document text
    • https://www.perfumista.co.uk/wp-content/plugins/super-forms/uploads/php/files/42cfc3b173a1c1ae0b8388e0609e25ba/mosod.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=black+bat+wings+templatePDF 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_off0000e131.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE131 16492 bytes
SHA-256: 68d48fea8b0f24769d038a869e7e038a2eaa5b2aeeb97e64874b7570b3e30bd4
font_01_sfnt_off00010c10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C10 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012427.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12427 10868 bytes
SHA-256: 0a2dcfafe76640a08b77f9755c366ec70c00db9350ca1049a04098706debbc66