Malicious PDF — malware analysis report

Static analysis result for SHA-256 a672ddc5d0bd2785…

MALICIOUS

PDF

81.3 KB Created: 2021-09-21 12:49:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 5dfa310f9ce4351307769b91d1d46458 SHA-1: 1a082a3d3040a9caa8115f689c4c0a180b0db4fb SHA-256: a672ddc5d0bd27851faed876da47a195dd07d124c0207352f120415754008e7f
196 Risk Score

Malware Insights

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

This PDF document is flagged as malicious by ML classifiers and ClamAV, indicating it is a phishing or trojan delivery mechanism. The heuristic 'SE_BROWSER_INSTALL_LURE' suggests the document attempts to trick the user into installing malicious browser extensions or updates. Numerous embedded URLs point to compromised websites and disposable hosting, likely serving as download locations for further payloads or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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 https://allytemp.ru/uplcv?utm_term=convert+word+to+excel+free PDF link annotation
    • http://metzgerei-bischof.de/userfiles/file/zemirije.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/8081c9b3c3dde4902ec13189bac3372a/babezeborajo.pdfIn PDF document text
    • http://freemansphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ed8a510ef0---27585272239.pdfIn PDF document text
    • https://nhahangthanghuong.com/uploads/files/bejudikojena.pdfIn PDF document text
    • https://fokusmedia.com/images/uploads/detufuwidonanixip.pdfIn PDF document text
    • https://mzr-avocats.com/buddha/ckfinder/userfiles/files/miboxajedumegilorop.pdfIn PDF document text
    • http://erfolgsapp.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613fa7244f51f---52950531433.pdfIn PDF document text
    • http://www.fattyweng.com.sg/wp-content/plugins/formcraft/file-upload/server/content/files/161389bd1cf03d---mabekizu.pdfIn PDF document text
    • https://fasleh.net/Files/files/54457284822.pdfIn PDF document text
    • https://marathonroller.com/userfiles/files/ziwiwosetatujusisitafof.pdfIn PDF document text
    • https://braintreeclinics.com/app/webroot/img/files/muguvup.pdfIn PDF document text
    • http://xn--h1aaebajlcgx.xn--p1ai/sadm_files/borigujikuna.pdfIn PDF document text
    • https://transturist.ba/ckeditor/ckfinder/files/files/xolowifamew.pdfIn PDF document text
    • https://bohemiamaestro.com/webpagebuilder/ckfinder/userfiles/files/78613510320.pdfIn PDF document text
    • http://leebyunghun.org/new/upload/board/files/20356389225.pdfIn PDF document text
    • http://gordostcrista.ru/userfiles/file/feseruxupugizogitifogusej.pdfIn PDF document text
    • http://dezis.ru/uploads/files/39343324341.pdfIn PDF document text
    • http://slovoveri.org/userfiles/demupegafa.pdfIn PDF document text
    • http://fertilityupdates.com/userfiles/files/41169440067.pdfIn PDF document text
    • https://mgs-on-track.com/uploads/misc/files/sinikego.pdfIn PDF document text
    • https://berettyotv.hu/userfiles/files/giradaxami.pdfIn PDF document text
    • https://camgloberealtor.com/userfiles/file/72994584968.pdfIn PDF document text
    • http://yds-wcv.jp/free_images/files/molikufise.pdfIn PDF document text
    • http://henghuitong.com/jingkelun/userfiles/files/20210914091127.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_off0000d9d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9D5 18256 bytes
SHA-256: c36a8554ca36869e1a7ff09e92aa65391ee4c97f30be3edd7ae41630328c6622
font_01_sfnt_off0001087d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1087D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012094.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12094 10332 bytes
SHA-256: 902d641272805d397fdd32d62adb31a46a27e7441c734a9b8e877b6f92700d2e

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