Malicious PDF — malware analysis report

Static analysis result for SHA-256 9576d533f6478d29…

MALICIOUS

PDF

82.4 KB Created: 2021-09-19 12:37:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: ad230c1494b34ec748e474b26b9ef669 SHA-1: a085062ffa096d29ecb16daf1e0d1ea20307deb6 SHA-256: 9576d533f6478d2919f59133d383e6a069bec19cfbf6b7b5353f714f4612221e
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier as malicious. It contains embedded JavaScript and numerous external links, some hosted on compromised CMS upload storage and others on disposable domains, suggesting a link farm designed to redirect users to malicious sites. The presence of embedded JavaScript indicates potential for further malicious actions, such as downloading additional payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://pixomot.ru/uplcv?utm_term=where+do+you+find+the+qr+code+on+your+cell+phone PDF link annotation
    • http://www.leposeur.fr/site/upload/ckfinder/files/18208205949.pdfIn PDF document text
    • https://togeltop.net/contents/files/80989720343.pdfIn PDF document text
    • http://vip-cond.ru/userfiles/file/pilikunosasexawegirojo.pdfIn PDF document text
    • http://savalis.ru/userfiles/file/xedusubolifusoxeb.pdfIn PDF document text
    • http://trustycctv.com/ckfinder/userfiles/files/72420953199.pdfIn PDF document text
    • https://mabuksusu.com/contents/files/36798011228.pdfIn PDF document text
    • https://drakbera.com/ckeditor/ckfinder/userfiles/files/63407133453.pdfIn PDF document text
    • http://recviem.ru/img/upload/kirosiz.pdfIn PDF document text
    • http://kammed.com/userfiles/file/jetuzamosuliwexomepizasa.pdfIn PDF document text
    • http://cn-junsheng.com/upload/file///202191205812077.pdfIn PDF document text
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/82a0fb0e0dadd10ffcfca2bc44eaf1dc/jepemifazoda.pdfIn PDF document text
    • https://maloneslandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141352cbd963---laxojugemusejeriwip.pdfIn PDF document text
    • http://marikitaberbagi.com/userfiles/file/28756684926.pdfIn PDF document text
    • http://pololanna.com/user_img/files/zuxiwawedimevusosiwofofe.pdfIn PDF document text
    • https://inprovit.com/ckfinder/userfiles/files/10038368724.pdfIn PDF document text
    • https://u-spot.biz/js/ckfinder/userfiles/files/bokikowidawal.pdfIn PDF document text
    • http://abwmechanicsville.com/uploads/files/34047246885.pdfIn PDF document text
    • https://costumeworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/161313b2037cd4---26489070881.pdfIn PDF document text
    • http://abogarestudio.com/userfiles/file/maruwus.pdfIn PDF document text
    • https://fortlauderdale-carservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132c5227d6cb---68623140872.pdfIn PDF document text
    • https://aimara-bg.com/userfiles/file/labifiduvexaduvukekagut.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_off0000dc02.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC02 18036 bytes
SHA-256: f572a64801a73847f093d9899150c31ccde33042a45d624ad632287b6b8e994d
font_01_sfnt_off00010b1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B1B 10740 bytes
SHA-256: ffa5c8e723b710d8873ad547bee9081a177e5e0e62d6e503cf4bc857ff4f41bc
font_02_sfnt_off00012388.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12388 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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