Malicious PDF — malware analysis report

Static analysis result for SHA-256 9a003ca3b67942ce…

MALICIOUS

PDF

80.4 KB Created: 2021-09-22 20:04:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 79b575c8dbdbbe06beb887cb7f805036 SHA-1: 8cda55e1530f89dea5abfb6ef72dc08707d8cd79 SHA-256: 9a003ca3b67942ce7924c23cedd7daf078fc9d8479b1f4376c902051b7e0efb1
196 Risk Score

Malware Insights

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

This PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. The 'SE_BROWSER_INSTALL_LURE' heuristic indicates the document attempts to trick the user into installing a browser extension or update. While no scripts were directly extracted, the presence of numerous external URLs, many hosted on compromised or disposable domains, suggests a phishing or malware distribution campaign. The document likely serves as a lure to download a malicious payload or redirect to a phishing site.

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
  • 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://pixomot.ru/uplcv?utm_term=apps+keep+stopping+mi PDF link annotation
    • http://mcap.cz/images/uploadedimages/file/97045840871.pdfIn PDF document text
    • https://virtualpulse.eu/UserFiles/file/52559935992.pdfIn PDF document text
    • https://xcheck.vn/uploads/userfiles/file/nodazefixamidaguf.pdfIn PDF document text
    • https://www.generalutilities.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140e801319f3---64828052262.pdfIn PDF document text
    • http://xhzhengli.com/upload/powezowumo.pdfIn PDF document text
    • http://kythuatviet.vn/uploads/userfiles/file/3797205069.pdfIn PDF document text
    • http://igs.compcierge-asia.com/ckfinder/userfiles/files/3698927465.pdfIn PDF document text
    • http://balie.overeembv-profielen.nl/upload/files/44687747627.pdfIn PDF document text
    • https://siphouse96.com/wp-content/plugins/super-forms/uploads/php/files/d4dab40236d14488d5e811308ba0f31d/44279084050.pdfIn PDF document text
    • http://sapientgenerator.ru/files/userfiles/files/sadija.pdfIn PDF document text
    • http://smeeing.com/userfiles/files/36687579847.pdfIn PDF document text
    • http://www.optionassurance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1614898cf96fb1---nurodojivufuwivomikaz.pdfIn PDF document text
    • http://liveisagenix.com/ckfinder/userfiles/files/wiwubalojipa.pdfIn PDF document text
    • http://findmecakes.com/userfiles/files/80648996808.pdfIn PDF document text
    • http://generaltubi.com/container/ckfiles/files/17790686658.pdfIn PDF document text
    • http://zoldjogsi.hu/uploads/files/mirejiruvawogutufe.pdfIn PDF document text
    • http://cokhilegia.com/upload/files/45840840249.pdfIn PDF document text
    • https://ruh-center.ru/userfiles/file/1405005991.pdfIn PDF document text
    • http://quickfix-poland.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141d0f000221---xebafepemitu.pdfIn PDF document text
    • https://shevtsov-art.com/uploads/files/lamoj.pdfIn PDF document text
    • https://gulfb2b.com/userfiles/file/jakerumoxoxuduz.pdfIn PDF document text
    • https://www.bevillelecomte.ovh/ckfinder/userfiles/files/85385780447.pdfIn PDF document text
    • http://muzycznescyzoryki.pl/userfiles/file/dokexitunux.pdfIn PDF document text
    • http://100gastro.cz/soubory/files/fitirino.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_off0000d509.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD509 18256 bytes
SHA-256: f3edc8c6e696d6d988c66f7d92943b0fe2cd2eed8b2fbee9a72e7b2904c8c530
font_01_sfnt_off00010470.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10470 10360 bytes
SHA-256: ca34705324521535d97e3b434eb4962f123e0cec32adb7f3a3c22dec7138090f
font_02_sfnt_off00011beb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BEB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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