Malicious PDF — malware analysis report

Static analysis result for SHA-256 4f0d5859ec4a9c24…

MALICIOUS

PDF

75.5 KB Created: 2021-09-03 11:00:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 1c701d497980f2a8965fe5f0ef39a3ff SHA-1: 9415080b1564ef5673bdf49d1a6bab713d503474 SHA-256: 4f0d5859ec4a9c24eccd17188ff37b87d178be148368f6b250ff5153b3ef0765
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised websites and are structured as link farms. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution through these links. No scripts were extracted, and the document body was unreadable, but the URL analysis is sufficient to determine the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

Heuristics 6

  • 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.
  • 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://oniceh.ru/uplcv?utm_term=linde+h30d+forklift+manual PDF link annotation
    • http://trainternational.in/wp-content/plugins/formcraft/file-upload/server/content/files/1610406a704429---3734038056.pdfIn PDF document text
    • http://donkaew-furniture.com/ckfinder/userfiles/files/jupadubujod.pdfIn PDF document text
    • http://johndanton.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/naligukadepalurep.pdfIn PDF document text
    • https://dungcuruamui.com/wp-content/plugins/super-forms/uploads/php/files/c6if4rsd7vurqdvdvfkgho42fk/90317025378.pdfIn PDF document text
    • https://www.nrlandscapes.co.uk/wp-content/plugins/super-forms/uploads/php/files/f6ae1f6613fbb6f701e7ff68c8ef319b/denezotusenud.pdfIn PDF document text
    • http://www.miamiairportlimo.net/wp-content/plugins/formcraft/file-upload/server/content/files/16083e2e26973b---xivonemumanonujokomategox.pdfIn PDF document text
    • http://herodumpsterrental.com/wp-content/plugins/super-forms/uploads/php/files/57a07a0e82968ad7beec908a4d1c6dec/kutuzifagufesomawol.pdfIn PDF document text
    • https://mymango.ru/wp-content/plugins/super-forms/uploads/php/files/cec71b84a7ca2b9e750e201e186f1dbd/sejurovojad.pdfIn PDF document text
    • https://happycustomerservice.com/wp-content/plugins/super-forms/uploads/php/files/14703a6d1ea484681519be607e285451/savubovesukiwatisediw.pdfIn PDF document text
    • https://worldkelo.com/wp-content/plugins/super-forms/uploads/php/files/8709ffbb14244851e0899e28c1741a1c/xulozujom.pdfIn PDF document text
    • http://szkolka-wiercioch.pl/files/file/11652132837.pdfIn PDF document text
    • http://mesotects.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d6086a0e40---24656007868.pdfIn PDF document text
    • http://ristoranteyuri2.com/userfiles/file/vokabexajokufamojapelud.pdfIn PDF document text
    • https://jaunimodienos.lt/wp-content/plugins/super-forms/uploads/php/files/uumoqkrs1fpcdgq0jvl6ve0jui/zeraxeluxanogulumowifite.pdfIn PDF document text
    • http://cautrucpalang.vn/webroot/img/files/bawovu.pdfIn PDF document text
    • http://pvvc.cz/files/magogika.pdfIn PDF document text
    • http://www.nowsingapore.co.id/wp-content/plugins/formcraft/file-upload/server/content/files/16072277d3d47e---wukalidetawudedefe.pdfIn PDF document text
    • http://datev.hu/ckfinder/userfiles/files/39125081191.pdfIn PDF document text
    • http://bscartridge.com/pic/vamamodatinawoxisoweremor.pdfIn PDF document text
    • https://adasms.fr/userfiles/file/31848894348.pdfIn PDF document text
    • https://network-italia.com/file/bonopumisumevemi.pdfIn PDF document text
    • https://divorcioconsensual.com.br/wp-content/plugins/super-forms/uploads/php/files/96ac02e754917656d102f4fc9186b917/bodosozibunazegiwumidilux.pdfIn PDF document text
    • http://3qlohas.com/CKEdit/upload/files/jakumam.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_off0000c39f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC39F 10892 bytes
SHA-256: d395dc6713de0514766fa42e116b6af739118b1dad21865058534a62583f4d5b
font_01_sfnt_off0000dc98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC98 17176 bytes
SHA-256: 2d30fe1b87efdfb5ff0b0cc8dc6564ccd8e2158d5b444aa8f88341fe2633bb4a
font_02_sfnt_off0001089e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1089E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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