Malicious PDF — malware analysis report

Static analysis result for SHA-256 9d3de84accfde6f9…

MALICIOUS

PDF

86.1 KB Created: 2021-09-06 02:27:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 0e3a5e29161e9ec8fbf82ef2042fdbf0 SHA-1: 7f586a9f999a6ce1bd8ba19b8b99efb37eeee56f SHA-256: 9d3de84accfde6f9cb113345349e0146f2af1cc84c16d4fb83cdb282c0aaaf68
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to multiple compromised websites, suggesting an attempt to distribute malicious content or phish for information. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malware delivery mechanisms.

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 http://abc-tel.ru/data/File/zegovamerojizul.pdf In PDF document text
    • https://wavesmaroochydore.com/wp-content/plugins/super-forms/uploads/php/files/0g56t35a6g6s14nu202pqv4828/13909194343.pdfIn PDF document text
    • https://www.entornopublicitario.com/wp-content/plugins/super-forms/uploads/php/files/7eb28dfaafe7455d5b5140f89578fb6c/fukabu.pdfIn PDF document text
    • http://fsf-vastroad.com/userfiles/file/29787381131.pdfIn PDF document text
    • http://logo4you.dk/userfiles/file/59958974786.pdfIn PDF document text
    • http://penzionnakrizankach.cz/ckfinder/userfiles/files/dafisixu.pdfIn PDF document text
    • https://fourseasons.events/wp-content/plugins/super-forms/uploads/php/files/73ab7ad4c8dc0ad90d7b8e798cc02474/tutupujuridafunajotixud.pdfIn PDF document text
    • http://yetisirkaucuk.com/firma/files/7188497513.pdfIn PDF document text
    • http://qiangka.com/ckfinder/userfiles/files/dizuxazomarodarusakoma.pdfIn PDF document text
    • http://skikk.nl/app/webroot/files/userfiles/files/fewivoparoravatob.pdfIn PDF document text
    • http://snookerfootball.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16094249b46356---favenurerixerom.pdfIn PDF document text
    • http://ambulatorioveterinariomariani.it/userfiles/files/19533829268.pdfIn PDF document text
    • http://xn--12cfu9bc1efac9a9azfdsb7b9d1f0j.net/ckfinder/userfiles/files/kizasinip.pdfIn PDF document text
    • http://centroolosprato.it/userfiles/files/didipodapewegilelip.pdfIn PDF document text
    • https://faresaldabbous.com/uploads/files/55247425593.pdfIn PDF document text
    • http://jirehenl.com/userfiles/file/150517513507.pdfIn PDF document text
    • http://arabstina.com/ckfinder/userfiles/files/mamamavedomixoxerev.pdfIn PDF document text
    • http://dallaslandscapedesign.com/media/files/39083114275.pdfIn PDF document text
    • http://worksafeorg.com/wp-content/plugins/super-forms/uploads/php/files/k8umdbl500q9f9rsolbs7mnie1/ribunujejabigurawosewu.pdfIn PDF document text
    • http://kondicionery-vidnoe.ru/upload_picture/file/medaxiradagifedu.pdfIn PDF document text
    • http://www.colegiometa.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/16129456007672---84063148414.pdfIn PDF document text
    • http://bumsnab.ru/uploads/files/84540721217.pdfIn PDF document text
    • https://gagiongvitgiong.com/ckfinder/userfiles/files/10240647991.pdfIn PDF document text
    • http://dolphinegypt.net/userfiles/file/retotetepetodupifopapifu.pdfIn PDF document text
    • http://pansophers.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073ad1bed8d6---koxamixafepolatoja.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=metro+police+application+form+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_off0000ec0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC0E 10608 bytes
SHA-256: c64b11fbd2d165ce4f5b42a1a3acf615b798bad52f8dec120cb8cd04e6fd9d18
font_01_sfnt_off00010435.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10435 17908 bytes
SHA-256: b23c55d849f31e49a9b3ee20d6e665cea507406e32650069f690475cea8c13ea
font_02_sfnt_off00013279.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13279 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1