Malicious PDF — malware analysis report

Static analysis result for SHA-256 ddceba7c5235d94f…

MALICIOUS

PDF

76.2 KB Created: 2021-09-05 05:47:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: b09c6a093247a66c26792e1bfca3ad6c SHA-1: 9b2657a7d20fe0641966b265949366b609e23c6e SHA-256: ddceba7c5235d94f120f0dab33e33470fd51c10be80c95e5778eca80f1d6b1a1
156 Risk Score

Malware Insights

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

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains a link farm pointing to multiple compromised websites, likely intended to lure users into downloading further malicious content or visiting phishing pages. The heuristic PDF_SEO_DISPOSABLE_LINK_FARM indicates a pattern of using disposable hosting for these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://www.yoko-ono.be/images/userfiles/file/kavegalorojapagazi.pdf In PDF document text
    • https://motionslam.com/wp-content/plugins/super-forms/uploads/php/files/f3bda9003407d86686d230f0dfaf4756/jimaxujivovigotudevuso.pdfIn PDF document text
    • http://mirandatutoringcentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1609a4533e849e---gifefusos.pdfIn PDF document text
    • https://mandalaconfeccao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1611a1b9650910---domibozuvekiv.pdfIn PDF document text
    • https://xn--80aaa1anac6cg.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/29576761d753814b7175e1d4a3fae556/67588485966.pdfIn PDF document text
    • http://www.aunay-sous-auneau.fr/ckfinder/userfiles/files/20449271915.pdfIn PDF document text
    • https://sidexsideaudio.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1f2f03c93b---jazuronofol.pdfIn PDF document text
    • http://mko-yug.ru/wp-content/plugins/super-forms/uploads/php/files/ea2ac50ccbb314af8cd7b6f828e279e6/repulaxikije.pdfIn PDF document text
    • http://harmonie-avion.fr/actualite/files/silofobamawudesixogibev.pdfIn PDF document text
    • http://suankaew.net/upload/userfile/files/16429716365.pdfIn PDF document text
    • https://2greenchicks.com/wp-content/plugins/super-forms/uploads/php/files/f7593b2dd8c56e6bb178c79d1b160dd2/20943424529.pdfIn PDF document text
    • http://tatennis.ca/clients/29257/File/zaxobonezogodojupor.pdfIn PDF document text
    • http://wang023spa.com/userfiles/202107file/2021072314315070554.pdfIn PDF document text
    • https://master.plus/wp-content/plugins/super-forms/uploads/php/files/c9dc883b52d4ce4bb002dd98c380f61c/71655464391.pdfIn PDF document text
    • https://bistakalikotenetwork.com/userfiles/file/zadaxa.pdfIn PDF document text
    • https://personnelcle.com/userfiles/file/28199676103.pdfIn PDF document text
    • https://birudongker.com/contents//files/kufulag.pdfIn PDF document text
    • https://www.cosanuesa.com/componentes/editor/ckfinder/userfiles/files/mekoxamofuwun.pdfIn PDF document text
    • http://ehhs1969.com/clients/6/67/67a0fa02f482ea8575b7cec7429e43a8/File/lowomizetisan.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=gayana+s+lakmali+books+pdfPDF 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_off0000c1cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC1CC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d9e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9E3 10716 bytes
SHA-256: 3b1b1fd1bdb78a3d48eca3af99746a0d3dff95708710d82acda0ec2474a8c7a6
font_02_sfnt_off0000f23f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF23F 18564 bytes
SHA-256: 81588e2e85942171a380635420d615b92bd0a26008d7bf4461501346bcf74439

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