Malicious PDF — malware analysis report

Static analysis result for SHA-256 1074dafc157ce4f1…

MALICIOUS

PDF

78.7 KB Created: 2021-09-07 21:04:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 041dccb68a7e900194a663929fd512f6 SHA-1: 7af6843f468d2b1277c421a507c470b29f710073 SHA-256: 1074dafc157ce4f19c5f70e850055b80a7ee91933df2b3683cd9dc2c73df0417
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, directing users to multiple external websites, some hosted on compromised CMS uploads. This pattern is commonly used for phishing or distributing further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://circuitvietnamcambodge.com/hinhanh/file/66078805274.pdf In PDF document text
    • http://4grd.com/cmsimages/file/63995479329.pdfIn PDF document text
    • http://olsztyntransportmedyczny.pl/userfiles/file/41401304473.pdfIn PDF document text
    • https://makiriaszto.hu/ckfinder/userfiles/files/49720360160.pdfIn PDF document text
    • https://fnb-concepts.com/images/uploads/files/49708884673.pdfIn PDF document text
    • https://sodigital.it/wp-content/plugins/formcraft/file-upload/server/content/files/160c22b0a58547---86957547873.pdfIn PDF document text
    • https://wurstfargo.com/wp-content/plugins/super-forms/uploads/php/files/2da1874c361f22741a756d756db23a09/nafajesefosipipetiredaj.pdfIn PDF document text
    • http://maasmartcity.com/userfiles/file/goviwewevidukeg.pdfIn PDF document text
    • https://ethiquedevelopers.com/wp-content/plugins/super-forms/uploads/php/files/543763bafe82457164aafc854a496d13/bobovakoxewaj.pdfIn PDF document text
    • https://gtnet-engine.com/ckfinder/userfiles/files/noroparimewusilexikarizo.pdfIn PDF document text
    • https://socialchangefactory.org/wp-content/plugins/super-forms/uploads/php/files/0bc165164f97f1252342bf033cb8ed67/rifilozakagalekapolawe.pdfIn PDF document text
    • https://www.verpoort-bouw.be/wp-content/plugins/formcraft/file-upload/server/content/files/1606fd1abd56c7---9262646081.pdfIn PDF document text
    • http://anaminfo.com/attachfile/file/pofige.pdfIn PDF document text
    • https://www.erenang.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608818479c66f---kevisoxed.pdfIn PDF document text
    • https://dreptultau.hotnews.md/upload/userfiles/files/22046828381.pdfIn PDF document text
    • https://www.mixedclass.com.au/wp-content/plugins/super-forms/uploads/php/files/mq5v2uhm6vdlgk3tea3dd3s7ab/wudoneze.pdfIn PDF document text
    • https://www.sevgiliyevideo.net/wp-content/plugins/formcraft/file-upload/server/content/files/160943af839557---lawukunupaj.pdfIn PDF document text
    • https://refour.eu/wp-content/plugins/super-forms/uploads/php/files/aa08b3116b4e8bd328361c128b88e7a2/23969348898.pdfIn PDF document text
    • http://limpiasol.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c86dcc28a2---24855978086.pdfIn PDF document text
    • https://quickonboarding.com/wp-content/plugins/super-forms/uploads/php/files/1c34bf4c71b39a1b3f0079933b8dce85/wavefoledufetiwatuweb.pdfIn PDF document text
    • https://bayihoki99.com/contents/files/vaxoloro.pdfIn PDF document text
    • http://countryroadssiberianhuskies.com/clients/e/e1/e1b2222506e4b6fd6c510396e08362d3/File/67472588654.pdfIn PDF document text
    • http://contactconfiance.com/files/files/xowetabodi.pdfIn PDF document text
    • https://atphp.ch/userfiles/file/56688339335.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=pdf+to+word+online+converterPDF link annotation
    • 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_off0000cfef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFEF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e806.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE806 10292 bytes
SHA-256: 764c194cc66afae134273ebf59802843b36d6f31a86cbd55458b3b5c69002512
font_02_sfnt_off0000ff4e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF4E 17780 bytes
SHA-256: 74775770f0ad2bbd79609ab8c3b9b81a806360f41d83483f20da22e694b5bd1c

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