Malicious PDF — malware analysis report

Static analysis result for SHA-256 71a757298c5e2f50…

MALICIOUS

PDF

95.5 KB Created: 2021-07-09 14:15:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 26c932844dd5743621a698cab287f1bb SHA-1: 89003416fc0431864c1b8b2ee051a633d5da8211 SHA-256: 71a757298c5e2f500f672322578a646de6523d9e3b2f3ae459ec968bd05e7e47
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF document contains a link farm with numerous URLs pointing to compromised or disposable hosting domains, as indicated by the 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' heuristics. The ML classifier and ClamAV also flagged this PDF as malicious, specifically as a phishing trojan. The embedded URLs are likely intended to lead users to phishing sites or download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9820

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://esejsc.com/upload/files/tilux.pdf In PDF document text
    • https://mimpidia.com/contents//files/97486554890.pdfIn PDF document text
    • http://www.a-fairys-choice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c655485023---bomegugoguboxiwen.pdfIn PDF document text
    • https://wodepcb.cn/uploadfiles/files/mizumitodilatekuwutaxof.pdfIn PDF document text
    • https://www.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160964d1d55dc2---79986054454.pdfIn PDF document text
    • http://universalestetic.com/userfiles/file/88645248173.pdfIn PDF document text
    • http://sip7.online/wp-content/plugins/super-forms/uploads/php/files/d63c02a0d9f9cefda55fc6f60f029043/38998331794.pdfIn PDF document text
    • http://asfus.net/virgsurv/userfiles/file/31539102121.pdfIn PDF document text
    • http://asea-admin.com/_userfiles/file/20210502082057.pdfIn PDF document text
    • https://maxim-catering.de/wp-content/plugins/super-forms/uploads/php/files/q6nleugshc71qdjigr90ealu0v/texujiwevov.pdfIn PDF document text
    • http://come2menorca.com/images/file/95438502844.pdfIn PDF document text
    • http://hy-concrete.ru/d/files/72346591942.pdfIn PDF document text
    • https://inchirierielicopter.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1608e09cfeffad---35190998781.pdfIn PDF document text
    • http://caratow.eu/userfiles/file/furimozonowakugesikuzit.pdfIn PDF document text
    • http://debden.org/userfiles/file/59940689343.pdfIn PDF document text
    • http://calliopegoodrich.com/clients/73417/File/puxakajobifupokivu.pdfIn PDF document text
    • https://www.grandeprairie.org/wp-content/plugins/formcraft/file-upload/server/content/files/160820136bdbd7---kirimubedan.pdfIn PDF document text
    • http://kino-profi.com/wp-content/plugins/super-forms/uploads/php/files/cfdd533982cfca8d1169d9a03f58c0d3/valamavoninisuluxopoxuv.pdfIn PDF document text
    • http://remont-etalon.ru/upload/files/butupemunozazefapu.pdfIn PDF document text
    • http://aptchasers.com/FCKeditor/userfiles/file/81352599743.pdfIn PDF document text
    • http://ar-intl.net/wp-content/plugins/super-forms/uploads/php/files/3hfj6i3kk0acm4uqochbovsre6/jusazudasikawikobif.pdfIn PDF document text
    • https://laneopx.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a303fa5dc47---pemadozavevajo.pdfIn PDF document text
    • https://proektasis.gr/admin/spaw2/uploads/files/49457586292.pdfIn PDF document text
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/26d29ef75308f0beca0194feaaad7527/29316781240.pdfIn PDF document text
    • https://bellevuecommunityfoodbank.org/wp-content/plugins/super-forms/uploads/php/files/94c831621fb0057a25a363841ca30da9/zonemebexu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=bill+of+quantities+for+landscape+worksPDF 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_off00011276.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11276 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00012a8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A8D 11092 bytes
SHA-256: 35b4b9a191c7be3ee412609d8ef6962643bd2327446f65e471df08a685c00287
font_02_sfnt_off00014468.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14468 16824 bytes
SHA-256: dd7ad24084d7a128d31414c32050f24f07f0c7453d5097d2f8673a9640007912

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