Malicious PDF — malware analysis report

Static analysis result for SHA-256 1a85736fc881a5ae…

MALICIOUS

PDF

81.3 KB Created: 2021-09-15 22:46:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 874f66e425777b55f5d6c7bc8eaa6165 SHA-1: f2dfdf9d4cc416c5af9f1aa0d76b0cefc1a532a3 SHA-256: 1a85736fc881a5aeb5235d7e77377531ace688b8cae8d70fe1ff46d47c372c72
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to disposable hosting or compromised CMS upload directories, indicative of a link farm designed to lure users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery. No scripts were extracted, but the structure and URL patterns are consistent with a malicious PDF dropper.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://pibar.tw/uploads/files/202109090127536527.pdf In PDF document text
    • http://spamsmsgiare.com/media/ftp/file/36775206098.pdfIn PDF document text
    • http://bernardthevenet.fr/ckfinder/userfiles/files/48464531913.pdfIn PDF document text
    • http://petgears.com/app/webroot/files/file/bajek.pdfIn PDF document text
    • http://bdnchem.com/upload/files/repubefolesulenisino.pdfIn PDF document text
    • http://www.next-conseil.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1614129ffd9868---19309207870.pdfIn PDF document text
    • https://maintogelonline.bet/contents/files/22734199797.pdfIn PDF document text
    • http://vdi.vn/userfiles/file/97767658186.pdfIn PDF document text
    • https://totounited.com/contents/files/wivafelapa.pdfIn PDF document text
    • https://ivanamihic.com/files/pirad.pdfIn PDF document text
    • https://odlingfamily.com/userfiles/file/likezubonaburudiwuvamulem.pdfIn PDF document text
    • https://forumhotel.by/wp-content/plugins/super-forms/uploads/php/files/dt6vsp5g6g9j7l6fhov2bninj4/dipowutogaj.pdfIn PDF document text
    • http://mestav.sk/uploaded_images/file/sodabekef.pdfIn PDF document text
    • https://hahapediatric.com/uploads/files/202109081428006231.pdfIn PDF document text
    • http://wonderful-foods.net/userfiles/file/12223415163.pdfIn PDF document text
    • https://mediaget.ru/userfiles/files/fudapapopelegujaredufit.pdfIn PDF document text
    • http://babyindex.nl/images/uploads/rujopob.pdfIn PDF document text
    • http://mocphatreal.com/assets/images/ckfinder/files/kuxaturewurixavenu.pdfIn PDF document text
    • http://voyagevietnamlaos.com/hinhanh/file/86070751707.pdfIn PDF document text
    • http://www.expo-hotel.com/english/wp-content/plugins/formcraft/file-upload/server/content/files/1613fc72069924---72562968822.pdfIn PDF document text
    • https://atolab.it/wp-content/plugins/super-forms/uploads/php/files/073a1ff8f9bd6d33040f18175bd097d3/letemegimekapefufurovi.pdfIn PDF document text
    • http://www.putnamtaxi.net/wp-content/plugins/formcraft/file-upload/server/content/files/16140c5cad5961---fisoj.pdfIn PDF document text
    • https://maintogelonline.bet/contents/files/bikaxewopobujofedebumex.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=adult+video+downloader+apkPDF link annotation
    • https://b2cdemo.tickets.com/content/files/sutazoravekuwo.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_off0000d8b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8B2 18000 bytes
SHA-256: 04004f7ba22a9ab0e3f8a9af9295fb782af56c1e9a03060f424e923ba91d3148
font_01_sfnt_off00010796.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10796 10540 bytes
SHA-256: 5117cf2a23e8acb2d61659beaf4097bbb19b78fe6ccb6e34b94934c777b6f0c7
font_02_sfnt_off00011fc6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FC6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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