Malicious PDF — malware analysis report

Static analysis result for SHA-256 78128329b12648e2…

MALICIOUS

PDF

79.8 KB Created: 2021-09-07 18:00:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 1fa9c37b4c06e5d3ef7756b6b952d6bb SHA-1: a28f47fbd09023bec4deed9ae669e0410ce13e2b SHA-256: 78128329b12648e249cf1cfb2a25be8f11e314ef2fbbb03e6df8e8b50d64192d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file contains numerous links, many of which point to websites hosted on compromised CMS platforms or disposable domains, suggesting a link farm designed to distribute malicious content or facilitate phishing. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery via these external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

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://pixomot.ru/uplcv?utm_term=japanese+vocabulary+n3+pdf PDF link annotation
    • https://dom4m.de/userfiles/files/419283843.pdfIn PDF document text
    • http://savannahcentury.info/clients/4/44/449a5b3489ef279447e90cf6cdd72f1c/File/19062559094.pdfIn PDF document text
    • https://miamivanservice.net/wp-content/plugins/formcraft/file-upload/server/content/files/160fb3cc44e927---39800844568.pdfIn PDF document text
    • http://www.oschouston.com/osc/wp-content/plugins/formcraft/file-upload/server/content/files/160aba0a17f832---labitajugifizigidereve.pdfIn PDF document text
    • http://drairtools.com/ckfinder/userfiles/files/zawovunesovaze.pdfIn PDF document text
    • https://tfsroanoke.com/home/tfs/public_html/new/ckfinder/userfiles/files/73891299170.pdfIn PDF document text
    • http://matstravel.ru/userfiles/file/90343057642.pdfIn PDF document text
    • https://anzmrrn.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b32ce196656---38278864069.pdfIn PDF document text
    • https://www.hauptsache.cc/wp-content/plugins/formcraft/file-upload/server/content/files/160cefb512ca65---92980939261.pdfIn PDF document text
    • https://velvetskin.pl/wp-content/plugins/super-forms/uploads/php/files/aaf843ba31da048608378836abc0dd1c/gazojiwefe.pdfIn PDF document text
    • http://imhome-listings.com/userfiles/files/vufetubeda.pdfIn PDF document text
    • https://feng-shuiworld.com/userfiles/file/zobin.pdfIn PDF document text
    • http://eurolocal.info/sites/default/files/images/file/42964687573.pdfIn PDF document text
    • http://mamitobe.ru/files/file/vetazuvetivo.pdfIn PDF document text
    • http://uk-finansist.ru/userfiles/file/34589375776.pdfIn PDF document text
    • https://clove7.com/userfiles/file/34057658996.pdfIn PDF document text
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/cbe35ff7d23e8cdad7b82e12aa54799e/bivilon.pdfIn PDF document text
    • http://fedoro.ru/upload/file/80868259787.pdfIn PDF document text
    • http://spadhotel.com/basefile/spadhotelcom/files/kupumegefukiromezi.pdfIn PDF document text
    • http://dajuicebarus.com/uploads/files/15412558356.pdfIn PDF document text
    • https://prsnashville.com/wp-content/plugins/super-forms/uploads/php/files/88a70f9780a28290840c182d1e417901/86421242935.pdfIn PDF document text
    • http://liga-stf.ru/i/upload/files/3618199872.pdfIn PDF document text
    • http://aleeblog.com/wp-content/plugins/super-forms/uploads/php/files/fmc962shkp5f3tnvc7hud47f70/wibijitidamikimaxafasukod.pdfIn PDF document text
    • https://griby.biz/ckfinder/userfiles/files/natolasiji.pdfIn PDF document text
    • http://waltonjohnsonfamily.com/clients/870437/File/74382996053.pdfIn PDF document text
    • http://ctyrkolky-gamax.cz/data/dokumenty/10327504870.pdfIn PDF document text
    • http://borisovhlebprom.by/var/upload/file/zarinegedaxuwotogakazuba.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_off0000c8a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8A3 11004 bytes
SHA-256: 6fbdfcbe482878cef7e22c2860d9a2363d89291726074287ab07227d7e8a1dd4
font_01_sfnt_off0000e22d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE22D 21628 bytes
SHA-256: 0dde3bf7fb7e3f1c9d2c0604bbd2a7bad903e9edde89a05413faf8df1504b9dd
font_02_sfnt_off0001193d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1193D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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