Malicious PDF — malware analysis report

Static analysis result for SHA-256 3cf7887795676f70…

MALICIOUS

PDF

86.4 KB Created: 2021-08-01 13:17:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 14c7d23c1ee28f9774aae07c8649e6d7 SHA-1: e0be48d3a390795199255c606e982e18f603f770 SHA-256: 3cf7887795676f70efc57d87ebca833f4d2bb603ca01d2283dca81228673c7a4
156 Risk Score

Malware Insights

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

The file is identified as malicious by ClamAV and an ML classifier. It contains numerous external URIs and is described as a link farm hosted on compromised CMS uploads and disposable hosting. The PDF structure and embedded content suggest it's designed to redirect users to potentially malicious websites, possibly for phishing or SEO spam.

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://archism.ru/uplcv?utm_term=lazy+boy+recliner+spring+repair PDF link annotation
    • http://opalsolar.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160792f3771af1---gomamumifofewu.pdfIn PDF document text
    • https://juvelyrikoscentras.lt/Files/file/93423928976.pdfIn PDF document text
    • http://maytinhtuyenquang.com/home/maytinhtuy/domains/maytinhtuyenquang.com/public_html/images/file/58415578656.pdfIn PDF document text
    • https://www.lipfish.no/wp-content/plugins/formcraft/file-upload/server/content/files/16084d453f396f---vafuzonasu.pdfIn PDF document text
    • http://usaoxin.com/userfiles/2021-5/file/lilunataxane.pdfIn PDF document text
    • https://rclurie.com/wp-content/plugins/super-forms/uploads/php/files/6d051dc57ce9d8c0a01393d6931db4d6/sujegiz.pdfIn PDF document text
    • https://carmelocuritiba.com.br/ckfinder/userfiles/files/18118601202.pdfIn PDF document text
    • http://rotarylaspalmas.org/documentos/file/murajosegefokikerukep.pdfIn PDF document text
    • https://www.focus.mu/wp-content/plugins/super-forms/uploads/php/files/b4c99236947b2f9a3dff3b7ea6a9ef2c/68853418031.pdfIn PDF document text
    • http://chagatea.ru/wp-content/plugins/super-forms/uploads/php/files/475cb70737a2bfede7c1e4bdc2d19005/17791656387.pdfIn PDF document text
    • http://www.tekkoo.net/images/library/File/rinekawoverute.pdfIn PDF document text
    • https://www.travelticket.com.au/wp-content/plugins/super-forms/uploads/php/files/8dh870o4tmfh3lbdeqi2pu3n2q/nametitol.pdfIn PDF document text
    • https://studio45.live/wp-content/plugins/super-forms/uploads/php/files/mlpdpfn3i2m7nrjnpqqge2bqah/kerubodosalotofukigokiliv.pdfIn PDF document text
    • http://workprohealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608344bac8aa1---wimaza.pdfIn PDF document text
    • http://nanouklid.cz/upload/file/lanubokosawela.pdfIn PDF document text
    • https://deniz-sogutma.org/img/userfiles/file/fupalologeximewowelex.pdfIn PDF document text
    • http://multiseal.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/1607695c916085---43182296165.pdfIn PDF document text
    • https://encouragingmath.com/wp-content/plugins/super-forms/uploads/php/files/8aa03214fcd2dc08ad2b4366c63e75c9/tozibowokenos.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096c99e100d5---zuvusovunamuwuzasik.pdfIn PDF document text
    • http://springswellness.net/wp-content/plugins/formcraft/file-upload/server/content/files/160940e7f015bf---22119461037.pdfIn PDF document text
    • http://www.brennholz-heinlein.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a1e126164d9---4524933450.pdfIn PDF document text
    • https://paroles-vives.com/ckfinder/userfiles/files/45721214564.pdfIn PDF document text
    • http://bogelaipigeon.com/upload/file/79159129084.pdfIn PDF document text
    • https://harkakotony.hu/UserFiles/file/xawiwarowubi.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_off0000edf9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDF9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001060b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1060B 17480 bytes
SHA-256: bbcb6e68a0df074b9d9e86f60a3682041399b7ac771d2544770a56346dac1abc
font_02_sfnt_off00013390.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13390 10720 bytes
SHA-256: 8886e010e51eb38aff6565842dd0a9716241e2c0b4091708ede437cd67e2b239

Open this report in the interactive analyzer, or submit your own file for analysis.