Malicious PDF — malware analysis report

Static analysis result for SHA-256 765dfb8143ffab13…

MALICIOUS

PDF

95.5 KB Created: 2021-09-01 11:58:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: aa0558fcb4470be4c4aa32e3d050cfe6 SHA-1: 400d7d82ae0e78b7d25be1edfd23e6298711f563 SHA-256: 765dfb8143ffab138136f5ed006348d268ee9641d1dcd1142a7e4cbba87b6649
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs, many of which point to disposable hosting or compromised CMS upload directories, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware delivery. No scripts were extracted, but the PDF structure itself is indicative of a malicious lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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://mmckno2010.zkosuchdol.info/files/sinitipubu.pdf In PDF document text
    • http://www.highlandmetals.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1606dfbec8c8b7---gaxoxon.pdfIn PDF document text
    • http://lysfyyy.com/upload/files/90282772977.pdfIn PDF document text
    • https://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/16106f38a2a8f3---33797808280.pdfIn PDF document text
    • http://rollfactorytogo.com/uploads/files/sefuzitumanorepanavevuwil.pdfIn PDF document text
    • https://iasvn.org/Images_upload/files/wufeneparenotidarisagu.pdfIn PDF document text
    • https://lederstuehle-shop.de/ckfinder/userfiles/files/1640865100.pdfIn PDF document text
    • http://myucpb.net/userfiles/file/suxemoben.pdfIn PDF document text
    • https://macroedunet.com/userfiles/file/84755014751.pdfIn PDF document text
    • http://mirembeestate.co.ug/wp-content/plugins/formcraft/file-upload/server/content/files/16080ae48e907a---ropejebolabitaj.pdfIn PDF document text
    • http://madonnina.info/userfiles/files/jevuloditeziferojeve.pdfIn PDF document text
    • http://www.gradur.ba/wp-content/plugins/formcraft/file-upload/server/content/files/160b30ee11745a---dugajexejimutuzu.pdfIn PDF document text
    • http://oneself.pro/wp-content/plugins/formcraft/file-upload/server/content/files/1607a477f48e2c---vinowuvafesapozuxipanaxon.pdfIn PDF document text
    • http://anhuicrew.com/upload_fck/file/2021-9-1/20210901093427448730.pdfIn PDF document text
    • https://twr1115.net/files/fckeditor/file/tanuvaduwelo.pdfIn PDF document text
    • http://mega.kz/media/upload/files/698294410.pdfIn PDF document text
    • https://www.budgetskemaet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1609449548d993---mavabuwivivogusorufotovav.pdfIn PDF document text
    • https://truck-diagnostic.ru/wp-content/plugins/super-forms/uploads/php/files/67666b78bd539d59746857f85a1874b8/bumesisudokutazemi.pdfIn PDF document text
    • http://normel.org/files/upload/file/lusasarapijakutuz.pdfIn PDF document text
    • http://geology.ie/wp-content/plugins/formcraft/file-upload/server/content/files/160ab98029ac67---siwabixuxavofu.pdfIn PDF document text
    • http://www.orhancoskun.com/wp-content/plugins/formcraft/file-upload/server/content/files/160def2062ef53---fujiwagafixix.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=funny+things+siri+can+doPDF 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_off00010dcd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DCD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000125df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125DF 19044 bytes
SHA-256: 9ccc7c26d3d3afc48de3d169b902214352daa32dec90f21087c72145fe645870
font_02_sfnt_off00015786.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15786 10664 bytes
SHA-256: 457368b006866e792bbe923db7d129825d1dc5b4efc1762ca0205d2d92d38145

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