Malicious PDF — malware analysis report

Static analysis result for SHA-256 993e6ea192a6deed…

MALICIOUS

PDF

88.9 KB Created: 2021-07-27 15:46:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: c84b17842e7603e3a7c99ca8284cae30 SHA-1: 04d3e1452936b8f455a28c9cbbe066d00088908d SHA-256: 993e6ea192a6deed7360f47fd4d957de74ae80b05b416637b3bd6a50e0f7214f
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to multiple domains, some of which are hosted on compromised CMS uploads or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to trick users into downloading further malicious content. The presence of numerous PDF link farm heuristics and the high ML score support this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://sl-light.ru/design/img/upload/file/14842605124.pdf
    • https://louvre.lv/res/wysiwyg/file/65884404790.pdf
    • https://kes-stv.ru/wp-content/plugins/super-forms/uploads/php/files/98edd431e150a0aba35a04e7677b7366/pekavesid.pdf
    • https://realimpacto.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160d84b9c8116a---xowuba.pdf
    • http://medicamarsala.it/userfiles/files/tifebijebifuriwa.pdf
    • http://www.zopfitravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c56d3e548d0---kakezojomo.pdf
    • https://michaels-limo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab2cb661f13---55482163304.pdf
    • https://feriaesotericadeatocha.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607535c672014---motigade.pdf
    • http://adabaskimerkezi.com/upload/file/falorulofuzoduvizanemodew.pdf
    • https://dtcprojects.com.au/wp-content/plugins/super-forms/uploads/php/files/l8e42553ddjq9kise1eft9b0v4/fakikofa.pdf
    • http://zimaletto.com/uploads/file/28515160425.pdf
    • https://bursac.net/userfiles/file/59394907718.pdf
    • https://restavracia02.com/userfiles/file/97146080865.pdf
    • http://www.driftime.ee/wp-content/plugins/formcraft/file-upload/server/content/files/1609108b81d4be---kopemijexisafesejomefi.pdf
    • http://glovimex.com/uploads/ckfinder/files/99711697815.pdf
    • http://zaragozalawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/boxebebuwivutaxoje.pdf
    • http://sanarina.de/ckfinder/userfiles/files/39748562151.pdf
    • http://thepokewave.com/uploads/files/74296130876.pdf
    • http://quaretti.it/userfiles/files/fenojemudekavavom.pdf
    • http://aivieksteslaivas.lv/userfiles/file/nibipoki.pdf
    • http://msci.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/16096307464ce5---23019419480.pdf
    • https://www.nrlandscapes.co.uk/wp-content/plugins/super-forms/uploads/php/files/5c5fb94f614447b5765dad1e3c0d6a3a/24742213308.pdf
    • https://husvagnsexpo.se/wp-content/plugins/formcraft/file-upload/server/content/files/160c49ccabfa46---68744869978.pdf
    • http://krukewittfarms.com/userfiles/file/68691259843.pdf
    • https://pk-kuepfer.ch/ckfinder/userfiles/files/tusepewenulivuxopafunuko.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=aaluma+doluma+mp3+songs+download+masstamilan
    • 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_off0000f7a1.bin
45f6e4b7f5ca2a52d55113c4643401cf14ee8a764d255c2fab881978746ba0e2
pdf-font-stream PDF embedded font (sfnt) at offset 0xF7A1 10840 bytes
font_01_sfnt_off00011078.bin
57b6b7ac9866110c78a76a7acdd47403cff05a548a4cbf159726fb79860f287e
pdf-font-stream PDF embedded font (sfnt) at offset 0x11078 17224 bytes
font_02_sfnt_off00013d7f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13D7F 16792 bytes