Malicious PDF — malware analysis report

Static analysis result for SHA-256 a6cfd5f326624004…

MALICIOUS

PDF

80.7 KB Created: 2021-09-21 03:26:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 2a6055dfcfd75613351637db42811eed SHA-1: 9be558c9dbcb960137295a50ba1cc10fe8c475d7 SHA-256: a6cfd5f326624004b5d1c685e7c8ee67e3f40aed9af25b89f8fcd7a9e4fc92b1
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains embedded JavaScript, which is often used to redirect users to malicious websites. The heuristics indicate a link farm pointing to compromised CMS uploads and disposable hosting, suggesting an attempt to distribute phishing content or malware. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery via embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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 https://nomylo.ru/uplcv?utm_term=harry+potter+first+movie+streaming PDF link annotation
    • http://studioiulianella.it/userfiles/files/welurutakarimilafet.pdfIn PDF document text
    • https://thebillionbottom.com/business_school/uploads/file/fibewugukiv.pdfIn PDF document text
    • https://pmsp-me.com/userfiles/files/40385625798.pdfIn PDF document text
    • http://parfumerieindex.nl/images/uploads/51996254221.pdfIn PDF document text
    • https://premiumvipbusiness.com/wp-content/plugins/super-forms/uploads/php/files/01e46ae0825f704b16e7105e3825fa4d/tadajijekalixusid.pdfIn PDF document text
    • http://www.yoko-ono.be/images/userfiles/file/wasuredepevivijinuxipuzi.pdfIn PDF document text
    • https://siriusdynamics.com/assets/uploads/files/konufelakilutoli.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613493e644c15---zoxetanuzopetafegorutovif.pdfIn PDF document text
    • http://vonschickenfremont.com/uploads/files/nererozotenuruxevijilop.pdfIn PDF document text
    • https://dammesliepas.lv/ckfinder/userfiles/files/netebisojevotekavusese.pdfIn PDF document text
    • https://hantverksakuten.se/ckfinder/userfiles/files/rugojofarawilebefiwef.pdfIn PDF document text
    • http://hit-air.pro/ckfinder/userfiles/files/saxunefadove.pdfIn PDF document text
    • http://traslochimontalto.it/userfiles/files/80591400853.pdfIn PDF document text
    • http://85560891.com/upfolder/e/files/20210920125843.pdfIn PDF document text
    • http://due.pt/js/ckfinder/userfiles/files/gaxoturaduxefuraturepap.pdfIn PDF document text
    • http://orsini-blasioli.it/userfiles/files/45045276479.pdfIn PDF document text
    • https://jahanchart.ir/data/files/file/87016620300.pdfIn PDF document text
    • http://youngshiny.com/userfiles/file/1631312842.pdfIn PDF document text
    • http://chinalabware.ru/d/files/77145322038.pdfIn PDF document text
    • http://www.uppld.org/wp-content/plugins/formcraft/file-upload/server/content/files/16134324610c1e---81239822926.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c099.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC099 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d8b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8B0 10824 bytes
SHA-256: 692a24fa4bdb62af53e3014f80c54e186044f34fd4cd6a474dc0e8ba72048824
font_02_sfnt_off0000f1ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1AC 16448 bytes
SHA-256: 0e4cde3d5bdd5452960de995a4807c8da4ec665155a9812e2f8e54e6c49b7878
font_03_sfnt_off00010881.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10881 17000 bytes
SHA-256: 314e56e3acce4957f3c18c6b425a836c9293c033177a27a842cf0acd7d335029

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