Malicious PDF — malware analysis report

Static analysis result for SHA-256 767df860cb7756fc…

MALICIOUS

PDF

78.2 KB Created: 2021-09-07 04:45:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 179f7c116e69eb44f69f08f2d4132f29 SHA-1: 03f1af0aa147737ae0a7843c466499ab869a3967 SHA-256: 767df860cb7756fcf4623ab1cea1e47716871539e8c1085021d61064c3fc766c
164 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The presence of multiple links to compromised CMS upload storage and disposable hosting, combined with a heuristic for a 'download button' lure, suggests a phishing or malware distribution attempt. No scripts were extracted, but the PDF structure and linked URLs point towards a social engineering attack designed to trick users into downloading further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://tochalco.com/uploads/files/12128479117.pdf In PDF document text
    • http://www.absolutecateringla.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bff79ba82d8---69195795322.pdfIn PDF document text
    • http://www.ccengis.be/applications/ckeditor/addons/ckeditor/ckfinder/userfiles/files/64536931296.pdfIn PDF document text
    • https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac7773d5be6---86388005828.pdfIn PDF document text
    • http://lobanowscy.pl/userfiles/file/jatosunofemegegolekizem.pdfIn PDF document text
    • https://www.getfitcrew.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609541063a795---fubuxobujesadomuruzu.pdfIn PDF document text
    • http://aburobocon2019.mnb.mn/uploads/files/35739256798.pdfIn PDF document text
    • http://ff-engineering.com/userfiles/files/gejexikotefoliwup.pdfIn PDF document text
    • http://harasim.cz/uploaded/files/basenarowibemutosatulej.pdfIn PDF document text
    • https://onecre.com/images/content/files/maxebotupun.pdfIn PDF document text
    • http://kagoshimakojintaxi.com/userfiles/file/96817355634.pdfIn PDF document text
    • https://www.endthestigmacounselling.com/wp-content/plugins/super-forms/uploads/php/files/rohbak2lacs3gha26ue91ft2ee/nibakekodud.pdfIn PDF document text
    • http://cuanhuaabshanquoc.vn/files/27020050161.pdfIn PDF document text
    • https://malimbe.africa/wp-content/plugins/super-forms/uploads/php/files/9247809e2c8f94cd6c3f930493504fd2/timunuwejurosutuwoga.pdfIn PDF document text
    • http://tg-focus.ru/userfiles/files/welewew.pdfIn PDF document text
    • http://tokyoto.pl/UserFiles/file/76298414988.pdfIn PDF document text
    • https://www.kindspring.org/inc/ckfinder/userfiles/files/71016063342.pdfIn PDF document text
    • https://www.caesarstravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d16c0cee06---makimutufusojokimo.pdfIn PDF document text
    • http://aggengr.com/uploads/CMS/file/dazukosatasejumifiwe.pdfIn PDF document text
    • https://biovuspharma.net/userfiles/files/lojeruze.pdfIn PDF document text
    • http://gtshotel.it/images/file/42913842426.pdfIn PDF document text
    • http://bargiel.com.pl/ckfinder/userfiles/files/roremukafawesaxudagaz.pdfIn PDF document text
    • https://cuatudongsaigon.vn/uploads/files/61545005285.pdfIn PDF document text
    • http://crocepadrekolbe.it/userfiles/files/47373317076.pdfIn PDF document text
    • https://desertflying.club/wp-content/plugins/formcraft/file-upload/server/content/files/1607c4e6a676da---5874741966.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=scott+foresman+grammar+and+writing+practice+book+grade+2+pdfPDF 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_off0000c6cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6CC 18072 bytes
SHA-256: 73457715513e7f9553dcafd555d93ad0b01dc0df1f0e8cce215fef35ca3ea095
font_01_sfnt_off0000f5df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5DF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010df6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DF6 11428 bytes
SHA-256: 27cbbbfc17f049a435a5a99b2b46f3e09f870ab044356a36977ee5c01d631b0f

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