Malicious PDF — malware analysis report

Static analysis result for SHA-256 a9242cfed6f0cbab…

MALICIOUS

PDF

84.8 KB Created: 2021-09-22 16:01:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a085c897974ddb09afb568242c51ba85 SHA-1: 61e5c7d619f5ceac95b87281f2ae5c406dc27757 SHA-256: a9242cfed6f0cbab5ffaa3691e54a4855dc63e9e7af6eebe2799bd213d153e25
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs that point to other PDF files hosted on various websites, many of which appear to be compromised or disposable. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The primary attack pattern involves luring users to click on links that lead to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://infrive.ru/uplcv?utm_term=tap+in+saweetie+roblox+id
    • http://ayurveda-shiatsu-nice.com/upload/files/wazemosozifewaxobatokijo.pdf
    • http://www.playerclub.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613cce45150dc---84904045943.pdf
    • https://hijaulumut.com/contents/files/53087583195.pdf
    • http://rund.cz/UserFiles/File/lonesuvapibojufipele.pdf
    • http://nakakinpump.kr/fckeditor/upload/file/51998006220.pdf
    • https://silky.ae/images/bulk_images/files/877778324.pdf
    • http://ahchala.com/img/file/wogidinupidokokefom.pdf
    • http://villaturri.it/wp-content/plugins/formcraft/file-upload/server/content/files/1612eece24ca3b---kexapusijopigusafivazil.pdf
    • https://directprocessors.com/wp-content/plugins/formcraft/file-upload/server/content/files/16145036d19e54---geveda.pdf
    • https://blogsma.com/files/tafevovek.pdf
    • https://rm-parketi.si/uploads/papoxomejiruta.pdf
    • https://greenvalleykerala.com/ckfinder/userfiles/files/gokepef.pdf
    • https://basisangka.com/contents/files/zetezasikagimoxojidelo.pdf
    • https://preciseenergygroup.com/media/25382559866.pdf
    • https://nakatarikaszel.pl/app/webroot/userfiles/file/nijizut.pdf
    • https://reniuved.it/file/puzerifugumuvuwomewoze.pdf
    • http://exima.kr/userData/board/file/mapefekigovegekuvov.pdf
    • https://gs-hemeringen.de/ablage/userfiles/files/sawetivejes.pdf
    • http://okuninka-biale.pl/userfiles/file/15258089334.pdf
    • http://autoset66.ru/admin/ckfinder/userfiles/files/siwesozusamilavet.pdf
    • http://studioassociatoemc.com/userfiles/files/24548685380.pdf
    • https://rsvforum.com/userfiles/file/zorosorejolewoguvuvigo.pdf
    • http://the-bom.kr/upfile/files/39983451917.pdf
    • https://ocw.tw/uploads/files/tebakilanizafiduseg.pdf
    • http://air-ned.com/uploads/files/mupawonibumimekifuviwa.pdf
    • 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_off0000e4e7.bin
db8cbe0d6261693c235d5420061246334854c779f6ce28c8b25d4544a11229ba		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE4E7 10676 bytes
font_01_sfnt_off0000fd5f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFD5F 16792 bytes
font_02_sfnt_off00011571.bin
7822e620c8804e5d83865deef59404beeeb71475f2e1215ced769410a0961235		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11571 18136 bytes

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