Malicious PDF — malware analysis report

Static analysis result for SHA-256 10844bc8b7b4f8cb…

MALICIOUS

PDF

79.8 KB Created: 2021-09-05 14:42:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 9e2a46ffbc735e2ad25c45bd45a36547 SHA-1: 297df202a8b2a51e8985264e9a1c30cca45480a4 SHA-256: 10844bc8b7b4f8cbebfaa27410e93215da9809ca4a981746acb10be05e62c8a1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to multiple disposable hosting domains, a common tactic for distributing malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and URL patterns suggest it's designed to redirect users to malicious payloads.

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 https://darkoyunpin.com/calisma2/files/uploads/85166967201.pdf In PDF document text
    • https://kolodezrus.ru/wp-content/plugins/super-forms/uploads/php/files/91591ff10ed8637ac7069f52909df9bb/tojowif.pdfIn PDF document text
    • http://boldino-hotel.com/ckfinder/userfiles/files/76574114118.pdfIn PDF document text
    • http://www.nandomoraes.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608a3d4aacf95---fejirifowamuw.pdfIn PDF document text
    • http://mirembeestate.co.ug/wp-content/plugins/formcraft/file-upload/server/content/files/160a26d12d90e5---jonokixogarojosunutinalab.pdfIn PDF document text
    • https://mithermomix.com.mx/wp-content/plugins/super-forms/uploads/php/files/41bd0d90f3091b738d6f2e319577a9d9/lajinawejozop.pdfIn PDF document text
    • http://cn-junsheng.com/upload/file///202162855559523.pdfIn PDF document text
    • http://smartcookieacademy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b0c4e1eeebd---47117699399.pdfIn PDF document text
    • https://svetpoznaniyaonline.ru/wp-content/plugins/super-forms/uploads/php/files/8858e6632e034e0dc41e9e8dc5d7e688/22986667885.pdfIn PDF document text
    • https://securityguardsupply.org/php/uploads/file/lumarekefotewupufawija.pdfIn PDF document text
    • https://www.finestkindcharter.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607faf0718fe9---bilumedesesuwilumujiki.pdfIn PDF document text
    • http://www.theagentpipeline.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac85cd5855f---nekoxogexeva.pdfIn PDF document text
    • https://globalclassic.org/wp-content/plugins/super-forms/uploads/php/files/ocb604027frn0dd48lgudde1l6/87476184817.pdfIn PDF document text
    • http://dichvutot99.com/webroot/img/files/tagekiwatun.pdfIn PDF document text
    • http://yokohama-model.com/userfiles/files/polanerasudawuvamogufise.pdfIn PDF document text
    • http://atlonnuri.org/UpLoadImage/editer/files/saguxu.pdfIn PDF document text
    • http://nawooelcs.com/upload/userfiles/2021/08/files/210829205052.pdfIn PDF document text
    • https://eclipsetheaters.com/wp-content/plugins/formcraft/file-upload/server/content/files/160af955fb3200---25849480803.pdfIn PDF document text
    • http://koreaseals.com/ckfinder/userfiles/files/zasonomo.pdfIn PDF document text
    • https://cvenhancer.com/wp-content/plugins/super-forms/uploads/php/files/1af4f0f304f3e316f3a9d526df7fe952/55051086835.pdfIn PDF document text
    • https://lostsoulsmemorialnj.org/wp-content/plugins/super-forms/uploads/php/files/3d993197f1272268f98af8681f6dd48b/jegolura.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=kindergarten+writing+worksheets+australiaPDF 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_off0000d591.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD591 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000eda3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDA3 17036 bytes
SHA-256: 117d5cb854558af725c9128f372acd69294ba076a2dd813bd3af5dc14090fa57
font_02_sfnt_off00011938.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11938 10796 bytes
SHA-256: 2a4e24021ea13505c8676bf6bb36dc6e6e741edad2a4cdf5811344effa5b9304

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