Malicious PDF — malware analysis report

Static analysis result for SHA-256 d3f82b612165588b…

MALICIOUS

PDF

69.0 KB Created: 2021-09-08 03:19:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 49b7153fc67fed9b0c974e954b179f38 SHA-1: d1cb388a0aaaaaf892090b978af566be9261f5bc SHA-256: d3f82b612165588b4b2308197232b2e1b7be55b4370cecdd45589e96985056f0
156 Risk Score

Malware Insights

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

The PDF file contains a link farm with numerous URLs, many of which point to compromised WordPress upload storage or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to phishing or malware sites. No scripts were extracted, and the document body was unreadable, but the heuristic firings and URL analysis are sufficient to determine the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://school19-zav.ru/userfiles/file/zagariwuzesorujasabo.pdf In PDF document text
    • https://chameleoncoupons.com/adgprocessing/uploads/files/zanil.pdfIn PDF document text
    • http://micruts.org/userfiles/file/6844934406.pdfIn PDF document text
    • https://loan-financial.com/wp-content/plugins/super-forms/uploads/php/files/ef939602380cedc35b99a3c3c398fec8/luwijerolowasifezadaxa.pdfIn PDF document text
    • http://nfraccon.org/userfiles/file/zelegivigidudewa.pdfIn PDF document text
    • https://www.endthestigmacounselling.com/wp-content/plugins/super-forms/uploads/php/files/gse1senp1parmmb7vtslkmsin2/11376233560.pdfIn PDF document text
    • http://chinalabware.net/d/files/bukanuxato.pdfIn PDF document text
    • https://www.prowallpanama.com/wp-content/plugins/super-forms/uploads/php/files/3ffba3da154d0dc327697072d66fc29d/sutopi.pdfIn PDF document text
    • http://1-cx.com/ckfinder/userfiles/files/vifomagexixorajarigawenez.pdfIn PDF document text
    • http://axwelindia.com/uploads/57062506372.pdfIn PDF document text
    • http://drukarnia-warszawa.pl/pliki/file/kubofagezu.pdfIn PDF document text
    • http://sonhanint.com/uploadpic/sun/files/202108161158591133.pdfIn PDF document text
    • https://greenturtleproductions.com.au/wp-content/plugins/super-forms/uploads/php/files/70d9bb08bb620b37e4eabaf1a38688fd/xofuzufunomo.pdfIn PDF document text
    • http://juniorsmagazine.com/wp-content/plugins/formcraft/file-upload/server/content/files/160846a374ef95---5394676392.pdfIn PDF document text
    • http://beastyenergy.com/userfiles/file/wigimuwu.pdfIn PDF document text
    • https://ukdirectremovals.com/wp-content/plugins/super-forms/uploads/php/files/6507b27120cbedc5592b97cdf3835d9a/wabizij.pdfIn PDF document text
    • https://cesiedizioni.com/userfiles/file/tibinubidusu.pdfIn PDF document text
    • http://bangtaisay.com/uploads/userfiles/file/87963526715.pdfIn PDF document text
    • https://www.die-umzugsfabrik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4b43659896---60903237692.pdfIn PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/80650a1661828a66543ac2f19e6b6003/wesoguj.pdfIn PDF document text
    • https://ceilford.org/wp-content/plugins/super-forms/uploads/php/files/29a1e44731ef41ab6de00c06150dbb02/xixavisasujexifo.pdfIn PDF document text
    • http://harmonie-avion.fr/actualite/files/64886155989.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=ncic+offense+code+manualPDF 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b056.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB056 10516 bytes
SHA-256: e74d00a1000c3ee2ca74ea144bd999ad41e79ada42981744b13171f6dbca2b35
font_01_sfnt_off0000c83a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC83A 15096 bytes
SHA-256: 08e7916002adccc13422ae87f23e28ee39fcaa50cf83a3fd2b614ee3aeb57c8b
font_02_sfnt_off0000eed0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEED0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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