Malicious PDF — malware analysis report

Static analysis result for SHA-256 4fb474cffcf99037…

MALICIOUS

PDF

80.8 KB Created: 2021-06-25 17:49:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 2de5fa1792fc05bcac20319753b7e81d SHA-1: 43cab9504f814c52beb7e2476e2bc4c439d820cf SHA-256: 4fb474cffcf990370333e51d5a0e5202120a345b0c3a048a22803014f107d80b
96 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded URLs pointing to compromised WordPress sites, indicating it functions as a link farm. The ML classifier strongly suggests malicious intent, likely to redirect users to phishing pages or download further malware. No scripts were extracted, but the structure and URL distribution are indicative of a malicious campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://nomylo.ru/uplcv?utm_term=exes+and+ohs+they+haunt+me PDF link annotation
    • https://pfgmm.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160b3a4f8cfdda---tebufibivojuwerugojuwujuj.pdfIn PDF document text
    • http://www.a-fairys-choice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c01c722e0c5---burorubib.pdfIn PDF document text
    • https://museuminiaturesbesalu.com/files/xeruxiw.pdfIn PDF document text
    • http://sola-brothers.com/userfiles/file/dupepamo.pdfIn PDF document text
    • http://artmetinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba4e57ec6c0---91133237701.pdfIn PDF document text
    • http://syuncyoku.jp/upload/file/70288610501.pdfIn PDF document text
    • https://impariant-club.ru/wp-content/plugins/super-forms/uploads/php/files/619892e8c5765e71303eec3a250e4625/xobokekipanizaz.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/160863e73ac02b---38611189284.pdfIn PDF document text
    • https://kidneystonetreatment.in/userfiles/files/xamasa.pdfIn PDF document text
    • https://www.bouwenaaneensterkwerkgeversmerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b1cfafa8ab0---kuzimexaliziruzoroles.pdfIn PDF document text
    • https://cashofferoregon.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c687ea7288---figilitukidukisugavig.pdfIn PDF document text
    • http://grimastone.ru/files/11115912624.pdfIn PDF document text
    • https://etre-cheval.fr/Applications/MAMP/htdocs/etre%20cheval/news_pix/file/fufunevoge.pdfIn PDF document text
    • https://www.icslights.com/wp-content/plugins/super-forms/uploads/php/files/e9e8eb6fae18ffc8abbb6eba13c90b63/neluribavi.pdfIn PDF document text
    • http://elonsummerstorage.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f70727942e---batixofejuxoripuvokovi.pdfIn PDF document text
    • http://mirrorgallery.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079fcd7226b1---82736123611.pdfIn PDF document text
    • https://nhachoxebus.com/upload/fck/file/23557843980.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afb1f664ae6---89925424633.pdfIn PDF document text
    • http://www.tramag.pl/upload/file/40008472859.pdfIn PDF document text
    • http://sutinlawkrabi.com/ckfinder/userfiles/files/63713316306.pdfIn PDF document text
    • http://www.victorian-manor.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1607a446321f63---gakosixigaburalabupudomo.pdfIn PDF document text
    • http://4grd.com/cmsimages/file/57938481753.pdfIn PDF document text
    • https://m-co.de/wp-content/plugins/super-forms/uploads/php/files/b5jrrmqde7mg56c4dv32nlmh8g/91249744106.pdfIn PDF document text
    • http://principessavencanice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160743581a4cea---23161714305.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_off0000dac3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAC3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f2d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2D5 16644 bytes
SHA-256: e7e32ab2c1e0f0f481817b5ad8fd370a20cb2b03a09a9d12ea32eb4fed8f9806
font_02_sfnt_off00011e30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E30 10572 bytes
SHA-256: 0f61f806161d5811a41230a5e46d587f3f9533907da855cec83dbc49ce629f0f