Malicious PDF — malware analysis report

Static analysis result for SHA-256 851272a4483f7cff…

MALICIOUS

PDF

91.1 KB Created: 2021-09-04 02:58:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: c764ffbc7a941906da05ddca7ce98485 SHA-1: 613d2403c1651c31fddc53364002d47d6cd601a8 SHA-256: 851272a4483f7cfffe70f3c766485f7ba109e835932d1deae521f22834a30b28
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm pointing to compromised websites and disposable hosting, suggesting a phishing or malware distribution scheme. The embedded URLs and the nature of the heuristics strongly suggest this PDF is used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://duext.com/wp-content/plugins/super-forms/uploads/php/files/4a395ddad0b23c40cce5e59b45654bd3/wufokanodagij.pdf In PDF document text
    • http://medicare-darmstadt.de/bilder/UserImages/file/rutusovibemizi.pdfIn PDF document text
    • http://studioarchoggianiepartners.it/userfiles/files/lideza.pdfIn PDF document text
    • http://nakajima-ya.com/upload/save_image/files/gegiwexenumutezuzafageb.pdfIn PDF document text
    • http://elite-weekend.com/clients/9/94/945a7f92a07ecc721aac768ad340748a/File/viguzu.pdfIn PDF document text
    • https://glasschneider.koeln/wp-content/plugins/super-forms/uploads/php/files/vhsaa946ep3j4r3j6gda6t3gqq/68481283335.pdfIn PDF document text
    • https://apc-algercentre.dz/ckfinder/userfiles/files/kaxugotobosi.pdfIn PDF document text
    • http://asja-doll.ru/userfiles/file/dabix.pdfIn PDF document text
    • https://funke.be/data/file/wegagiwilu.pdfIn PDF document text
    • https://learn-atdi.com/uploads/files/32542737435.pdfIn PDF document text
    • http://mas.vacations/wp-content/plugins/formcraft/file-upload/server/content/files/1609103f10d327---87666105325.pdfIn PDF document text
    • http://rocincorporated.com/domain.com/images/dynamic_pages/file/75509169735.pdfIn PDF document text
    • http://www.next-conseil.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16099c59001732---dafop.pdfIn PDF document text
    • https://tradingphrases.com/userfiles/files/vakoluzezafu.pdfIn PDF document text
    • http://beautybybelief.com/admin/images/file/44810232035.pdfIn PDF document text
    • https://g-ortho.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b078a22fc7c---844887123.pdfIn PDF document text
    • http://zonwering-belgie.com/ckfinder/userfiles/files/24830264256.pdfIn PDF document text
    • https://songiadahoaian.com/upload/ck/files/44032254489.pdfIn PDF document text
    • https://estigotours.com/wp-content/plugins/super-forms/uploads/php/files/67bbce849442cf4940d0d0d0db293178/ladole.pdfIn PDF document text
    • http://razaviota.ir/basefile/razaviotair/files/78665237686.pdfIn PDF document text
    • https://adlinefor.com/home/webagen/public_html/korn/data/file/88515806598.pdfIn PDF document text
    • http://builderall.info/userfiles/file/4671145782.pdfIn PDF document text
    • https://gmonlinestore.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611874e2d7d94---8597589288.pdfIn PDF document text
    • http://joyearland.com/ckfinder/userfiles/files/wemagugosuwizoxafurop.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=elcometer+456+manual+pdfPDF 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_off0000f8a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8A4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000110bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110BB 10984 bytes
SHA-256: 5fd3fef44b54f2e8be0d9db40a15b653adfe230a81f36512cace20817330c2de
font_02_sfnt_off00012a4d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A4D 19888 bytes
SHA-256: 679237d7003e8486c2a968124e3fc6477ee4ee7ef40daa5f535abae3a77ef8ed

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