Malicious PDF — malware analysis report

Static analysis result for SHA-256 db5a39c4add04268…

MALICIOUS

PDF

79.6 KB Created: 2021-09-06 18:35:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 831ef4a831911ad0b5b8bd34f6823de6 SHA-1: 8562aa5eaf9a19e05a86e65706118f51f74cffe4 SHA-256: db5a39c4add042683b16746f8ddf39713e7bf90f58eb3d69888674cbe1a1ab2d
196 Risk Score

Malware Insights

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

This PDF document was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. The heuristic 'SE_BROWSER_INSTALL_LURE' indicates the document attempts social engineering by prompting the user to install a browser extension or update. The document also contains numerous links to external PDFs hosted on compromised websites, suggesting a link farm used to distribute malicious content or redirect users to phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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://www.mezmat.ru/ckfinder/userfiles/files/6946495413.pdf In PDF document text
    • http://jikaramen.com/uploads/files/67362429797.pdfIn PDF document text
    • http://pxmonastery.org/CKEdit/upload/files/tuwedugalejemopojitemuru.pdfIn PDF document text
    • https://aliencosmicexpo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098ac823c288---xurugolubemarobuzigeluduf.pdfIn PDF document text
    • http://www.putnamtaxi.net/wp-content/plugins/formcraft/file-upload/server/content/files/160775ef7daa06---janow.pdfIn PDF document text
    • http://flygarfield.net/userfiles/file/77217030935.pdfIn PDF document text
    • http://www.pilonidalsinus.gen.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1607a057e835df---gokonipo.pdfIn PDF document text
    • https://graffitipaintstudio.com/wp-content/plugins/super-forms/uploads/php/files/a185d8aa6b06e4733cf88bf2d52db8c3/fokofijipega.pdfIn PDF document text
    • http://yao-cheng.com/uploadfiles/20210905113718.pdfIn PDF document text
    • https://joepromenshealth.com/wp-content/plugins/super-forms/uploads/php/files/09bcddb69a9398eb0d6a9e1c34291841/rojujuxowumulazukonifotov.pdfIn PDF document text
    • http://bancasemecanino.com/userfiles/files/ganuxumedaguxigegine.pdfIn PDF document text
    • http://ccshecea.org/upload/files/79304823714.pdfIn PDF document text
    • http://cpils.com/userfiles/file/xibakapu.pdfIn PDF document text
    • https://medtek.vn/storage/file/lezosidovalotula.pdfIn PDF document text
    • https://rsun.pro/admin/ckfinder/userfiles/files/50671494443.pdfIn PDF document text
    • https://driftwoodcc.com/userfiles/files/2758832617.pdfIn PDF document text
    • https://www.avenueroadadvertising.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b874a8f1b98---16754928575.pdfIn PDF document text
    • https://charteriraq.ir/basefile/charteriraqir/files/zizavopogevuvububirinapiw.pdfIn PDF document text
    • http://www.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/160a8497cd257d---wixuzudazerume.pdfIn PDF document text
    • http://www.nanodrywash.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a001d6d46d1---nakirogiwobumuzo.pdfIn PDF document text
    • http://alpanelektrik.com/depo/sayfaresim/file/bamufofevinabimomuzomi.pdfIn PDF document text
    • http://optimus.org.au/wp-content/plugins/formcraft/file-upload/server/content/files/160986d50beac6---36425433494.pdfIn PDF document text
    • https://bawaniint.com/ckfinder/userfiles/files/fulurejeganawitut.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=how+to+enable+adobe+pdf+viewer+in+chromePDF 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_off0000d1b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1B7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e9ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9CE 11000 bytes
SHA-256: ee131457c86677700ee7cecb05d708bae0f6f5e1c9c2528a255526c15be288c4
font_02_sfnt_off000102e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102E9 17844 bytes
SHA-256: 8a1d0a8a70956a3dff83f97e5067fba73f93352264bdd38804cfa95192e6abb7

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