Malicious PDF — malware analysis report

Static analysis result for SHA-256 3af99677f1bd485d…

MALICIOUS

PDF

92.2 KB Created: 2021-08-06 06:56:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: c51d08df1bf584d39264a0f367e2dee9 SHA-1: 3fb5ed2f760aa5f33015ebde5bd84e00156785b3 SHA-256: 3af99677f1bd485dc7375d2601f33b29604e5c90ab2ccd3a8fa4243a5e03c651
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by a machine learning classifier and ClamAV, indicating a high likelihood of malicious intent. The document functions as a link farm, containing numerous external URIs that point to various websites, some of which are hosted on compromised WordPress installations. This suggests the PDF is likely used to redirect users to phishing sites or download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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 https://pixomot.ru/uplcv?utm_term=greatest+hymn+writers PDF link annotation
    • http://www.webtony.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607e03371b9d1---vopiketarubefuxifer.pdfIn PDF document text
    • https://leonardscopysystems.com/home/leonards/public_html/ckfinder/userfiles/files/takega.pdfIn PDF document text
    • http://nappsa.org/userfiles/file/910577413.pdfIn PDF document text
    • https://evrenmentese.com/upload/ckfinder/files/25761108141.pdfIn PDF document text
    • http://lotusromeo.fr/app/webroot/files/userfiles/files/65656981863.pdfIn PDF document text
    • https://www.ideaklinikankara.com/wp-content/plugins/formcraft/file-upload/server/content/files/160738caa9af8e---42541718030.pdfIn PDF document text
    • http://www.magicapro.it/wp-content/plugins/formcraft/file-upload/server/content/files/160c297485a2fb---70935662372.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/donevaviporasuxux.pdfIn PDF document text
    • http://playbabydoll.com/userfiles/file/gimanodakobapurewab.pdfIn PDF document text
    • https://glosunspa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ee2b305633---tediwobifoxanixizagut.pdfIn PDF document text
    • https://hoovermaids.com/wp-content/plugins/super-forms/uploads/php/files/724bd1d96e79a9c89763e18887c2904a/pajelex.pdfIn PDF document text
    • https://bnovum.hu/downloads/81467137407.pdfIn PDF document text
    • http://sartor.ru/upload/files/17787990922.pdfIn PDF document text
    • http://elite-nails.pl/Upload/file/sojafurubebomike.pdfIn PDF document text
    • https://loctra.net/userfiles/file/baxofanan.pdfIn PDF document text
    • http://caacoding.net/wp-content/plugins/formcraft/file-upload/server/content/files/16079be8d698ea---tanuzumil.pdfIn PDF document text
    • http://jkohut.pl/file/gidoduvisenewefu.pdfIn PDF document text
    • https://archcosmeticstudio.com.au/wp-content/plugins/super-forms/uploads/php/files/838fd1f340df0c3300a9cfdf13b22e5e/tomivilikijesidelur.pdfIn PDF document text
    • http://tandartsindex.nl/images/uploads/82943538420.pdfIn PDF document text
    • https://slide-bearing.com/d/files/gububulagagakax.pdfIn PDF document text
    • http://xn--b1agjlwjc3g.xn--p1ai/ckfinder/userfiles/files/dararegetiwabavisil.pdfIn PDF document text
    • http://nano-vip.com/ckfinder/userfiles/files/73423290845.pdfIn PDF document text
    • http://bigband-ulm.de/userfiles/files/vuxopi.pdfIn PDF document text
    • 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_off00010263.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10263 18324 bytes
SHA-256: 5fe71a8467d798a432e271a74d7b2355338ee98e216c3a96f70c310dfbebe16c
font_01_sfnt_off000131e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x131E6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000149fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x149FD 10448 bytes
SHA-256: 32375a3fb73adf4db62c8a63eb7293bdd69af43daccca20ed67748fd2b039c0a

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