Malicious PDF — malware analysis report

Static analysis result for SHA-256 dbc40564efeeb245…

MALICIOUS

PDF

81.4 KB Created: 2021-09-05 05:53:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: d62af1dafadac26de89cbb0113613710 SHA-1: b00c0532560d453fe2e6a2ad357aa21ba1a16e2a SHA-256: dbc40564efeeb2452ee00c381e4d83cd227802f9fccb9b50b132964e16119fb4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://inwebjor.ru/uplcv?utm_term=math+coloring+worksheets+1st+grade+free
    • https://epiphanych.com/images/file/66899663521.pdf
    • http://chiengthai.com/file_media/file_image/file/85096478250.pdf
    • http://espokebar.com/uploads/files/zovab.pdf
    • http://carszana.com/image/upload/File/8428210070.pdf
    • https://sipare.com.ar/wp-content/plugins/super-forms/uploads/php/files/1mdqmbkn67amrealog78o24hid/64706470591.pdf
    • http://bizwd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160774f4a50e51---rilorobexenakuzut.pdf
    • http://www.iamgoingto1996.com/wp-content/plugins/formcraft/file-upload/server/content/files/160796849d95c2---bomafo.pdf
    • https://alfa-pechati.ru/wp-content/plugins/super-forms/uploads/php/files/4cc7c542e4fd30c5225d1cd1b32399b5/natozugijik.pdf
    • https://www.baileysmilk.com/wp-content/plugins/super-forms/uploads/php/files/910235d21dea278bf6b8573bd16afdf3/69542708267.pdf
    • https://profbuhotchet.ru/wp-content/plugins/super-forms/uploads/php/files/a031e9a222a51979e3e7453b9feae6b2/levukiwebepudi.pdf
    • https://takiminsahada.com/wp-content/plugins/super-forms/uploads/php/files/sropldl6c12oe4haecq255unla/29883103715.pdf
    • http://clubcrudupsonoma.com/clients/1/14/14cf715f5cd05ddba197ceaa5938d7d5/File/58769804138.pdf
    • https://www.zulilighting.com/wp-content/plugins/super-forms/uploads/php/files/87ccdddbd28b2db0f6e73da1873a40c3/9311011097.pdf
    • http://www.petersmetalstitching.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1606f008f6abb5---83130029470.pdf
    • https://msr-hudsonproperties.com/wp-content/plugins/super-forms/uploads/php/files/77e0e13fe9a35f6f998c46604ad1d14c/zafinu.pdf
    • https://xn--80adj7cxa.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/06fc7b2e9695ba89f5494c8a746583b7/fupew.pdf
    • https://mls.lighting/wp-content/plugins/super-forms/uploads/php/files/f966221aa69d71b34e91ab274b0c1f78/14352388737.pdf
    • http://kavtas.com/images_upload/files/24033510811.pdf
    • https://studio-september.com/wp-content/plugins/super-forms/uploads/php/files/d1ab8f71d160b584100230e7270447d8/98845644725.pdf
    • http://hndgyl.com/v15/Upload/file/2021624232537701.pdf
    • https://www.cr-sdc.org/wp-content/plugins/super-forms/uploads/php/files/ee5ce3066bb3058c61b77005186a0cfb/tabuded.pdf
    • http://gespk.com/userfiles/file/11062312624.pdf
    • http://niestachow.pl/data/aktualnosci_imgs/file/zazojonixopiwajutugimo.pdf
    • http://naturallabs.de/userfiles/file/daguvugexidop.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d925.bin
ebe6a24aa78238f9d975a8e1f97f71ba96be49e273cb0669d1cc28b5c72b36b4
pdf-font-stream PDF embedded font (sfnt) at offset 0xD925 10980 bytes
font_01_sfnt_off0000f287.bin
a3de70ff1816509038b5dd12dd4e13dfa22b78ae622de208d00406b67afc4dc8
pdf-font-stream PDF embedded font (sfnt) at offset 0xF287 17444 bytes
font_02_sfnt_off00011fd8.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11FD8 16792 bytes