Malicious PDF — malware analysis report

Static analysis result for SHA-256 47f4bd2e449008c1…

MALICIOUS

PDF

74.1 KB Created: 2021-09-17 08:34:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 7886f0a6bbe83737f0fd494542ce01bb SHA-1: 67b6f783094dda6a995347aa30f9cf59242c06ea SHA-256: 47f4bd2e449008c16b10b039b6d36b13243c9566846e6914e0e84f86fcd5509c
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The sample is a PDF file identified as malicious by ClamAV and an ML classifier. It contains embedded JavaScript and a significant number of external URIs, many of which point to compromised CMS upload directories or are structured as link farms on disposable hosting. These characteristics suggest the PDF is intended to lure users to malicious sites, likely for phishing or to download further malware. The embedded JavaScript may be used to facilitate this redirection or exploit.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://harnettcountyhba.com/userfiles/file/mezegedisivinil.pdf In PDF document text
    • http://titibbs.xyz/js/ckfinder/userfiles/files/sugigodanegezidifukawo.pdfIn PDF document text
    • http://studioguatta.it/userfiles/files/52795091409.pdfIn PDF document text
    • http://donauwell.at/userfiles/file/nufenigefe.pdfIn PDF document text
    • http://neoneophytou.com/ckfinder/userfiles/files/58052086457.pdfIn PDF document text
    • http://computergramm.com/userfiles/file/68419507245.pdfIn PDF document text
    • http://quangcaosmsgiare.com/media/ftp/file/suboluwobirezefudiki.pdfIn PDF document text
    • https://abandassociates.com/ckfinder/userfiles/files/voxeropol.pdfIn PDF document text
    • http://mikol-styl.cz/userfiles/file/43576099194.pdfIn PDF document text
    • http://ipayon.com/root/FCKeditor/file/74980641191.pdfIn PDF document text
    • https://confidence-ist.com/ckfinder/userfiles/files/91364393473.pdfIn PDF document text
    • http://www.amedna.com/userfiles/files/revakadesused.pdfIn PDF document text
    • https://carthink.org/wp-content/plugins/formcraft/file-upload/server/content/files/161374e84c1a8b---72221893524.pdfIn PDF document text
    • https://nabijdefossa.nl/upload/files/64892801175.pdfIn PDF document text
    • http://myphammonly.com/luutru/files/66322027949.pdfIn PDF document text
    • http://intechsol.kz/wp-content/plugins/formcraft/file-upload/server/content/files/16130eb6e6ff8c---fojiregituzamuwofaxisoneg.pdfIn PDF document text
    • http://avtokit116.ru/!upload/files/renirebaluw.pdfIn PDF document text
    • https://falconshipping-uae.com/userfiles/files/lerimugelenofoto.pdfIn PDF document text
    • http://www.hkqi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b73b114c19---58686271422.pdfIn PDF document text
    • http://www.canadiantreasurer.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614209063e773---vilasilunifu.pdfIn PDF document text
    • http://basyapiemlak.com/yukleme_klasoru/userfiles/file/81678382787.pdfIn PDF document text
    • https://2-view.org/home/view/public_html/ckfinder/userfiles/files/bimovovodimimane.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=fish+that+has+a+light+on+its+headPDF 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_off0000bf6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF6B 17120 bytes
SHA-256: 1f4b814f893d57e014888777c20f4c6844447afda78207731a192dcfe62f7204
font_01_sfnt_off0000eb36.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB36 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001034d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1034D 10404 bytes
SHA-256: f6da69c315a98035eead655883a96edcda65e94d6421f6e81336fd8184a69bd0

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