Malicious PDF — malware analysis report

Static analysis result for SHA-256 d376b84f595698dd…

MALICIOUS

PDF

86.2 KB Created: 2021-09-20 21:05:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b7c164f59aac407fc0570b1cdcfc344b SHA-1: 7e0bcc8a2086d658421f904d8609325754ddc76d SHA-256: d376b84f595698dd9ea2176984008bf8809f81e7e5cde10a1b5756d1d209e603
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with many URLs pointing to potentially compromised sites or disposable hosting, likely to trick users into downloading further malware or visiting phishing pages. The presence of multiple PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM firings supports this conclusion.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://fujieshubao.com/zk/UploadFile/file/2021091514061273499.pdf
    • https://bdlvn.com/steel/upload/files/pabis.pdf
    • http://flagrant-desir.com/userfiles/file/83041579433.pdf
    • http://caythuocdangian.net/images/files/vikalodev.pdf
    • http://bacvietexpress.com/upload/userfiles/files/lavutidemojib.pdf
    • http://www.moyekolodin.com/files/sininimekisel.pdf
    • http://www.benvenutialmare.com/wp-content/plugins/formcraft/file-upload/server/content/files/161477e0919c66---87752829267.pdf
    • https://cpsguffanti.it/uploads/file/pozezekoseloruwedowobar.pdf
    • http://ed-web.cz/userfilesfile/69199489900.pdf
    • http://grupophi.es/uploads/files/tefosixopezunupoziw.pdf
    • https://angkorphotographyguide.com/userfiles/file/10717918993.pdf
    • https://solarconsulting.org/wp-content/plugins/super-forms/uploads/php/files/734261edd4892baf2432beabb48c37b2/fojumojexav.pdf
    • https://wecareprogram.org/images/file/8172098192.pdf
    • http://aotwresort.info/ckfinder/userfiles/files/93277715039.pdf
    • https://www.abrasco.org.br/ckfinder/userfiles/files/3452970446.pdf
    • http://asijskepotraviny.cz/files/file/jakuxo.pdf
    • http://maasmartcity.com/userfiles/file/70062982756.pdf
    • https://kaptenhoki.net/contents/files/45103745985.pdf
    • https://lsp.od.ua/wp-content/plugins/super-forms/uploads/php/files/5jinofq8ti6m9ulsekq7quor54/57784744878.pdf
    • http://bluebossa.pl/files/file/37895986785.pdf
    • https://rafautama.com/uploads/file/90053458998.pdf
    • http://mauchlineware.com/html/chapelstreet/web/userfiles/files/49792053551.pdf
    • http://sineadstone.com/userfiles/file/zapop.pdf
    • http://themadthinker.com/temp/vinney/HTML/userfiles/file/repakajuna.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=free+fortnite+download+on+android
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ec0e.bin
a04e392cf081d91a88da942c8da41f952f291394633c9226845b288b294cf342		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEC0E 18624 bytes
font_01_sfnt_off00011c28.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11C28 16792 bytes
font_02_sfnt_off0001343f.bin
7d825c7d5c59de567babc4a93a40fc231a2dc93b9bf8197b2e947076a47b1827		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1343F 10244 bytes

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