Malicious PDF — malware analysis report

Static analysis result for SHA-256 88162874db2c2dfb…

MALICIOUS

PDF

93.3 KB Created: 2021-07-10 12:29:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-02
MD5: 1bff641633fc6dbcb316026a2799f980 SHA-1: 3484c09bce3532b6b1f4295dd93bcc2ee71f29ca SHA-256: 88162874db2c2dfb03dc5d1275f06561ee2bbe530d2e695daae2846f6cf127c8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://laborke.ru/uplcv?utm_term=meaning+of+preload+in+heart PDF link annotation
    • https://cbdc.co/uploads/ckfinder/userfiles/files/34058404643.pdfIn PDF document text
    • https://otartufo.com/ckfinder/tartufofiles/files/54313952329.pdfIn PDF document text
    • http://daisytalavera.com/userfiles/files/69249884161.pdfIn PDF document text
    • https://beaufortbond.com/wp-content/plugins/super-forms/uploads/php/files/3b59ef8b57250072d146deeda14c24b8/kogunawenogudiwevufagofo.pdfIn PDF document text
    • https://jaunimodienos.lt/wp-content/plugins/super-forms/uploads/php/files/f94oakj8kp7bpp0t58m9ag2udc/nukenujejirodal.pdfIn PDF document text
    • http://kindervakantieweekdeurne.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160e9211453a1c---32412099895.pdfIn PDF document text
    • http://www.hcibatiment.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160afb0919915f---rudola.pdfIn PDF document text
    • https://xn--1--8kcai1ck2bs.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/07fd05968494b7e3bba9f520e9be4753/xezawovezovopabivuf.pdfIn PDF document text
    • https://journeywithmypet.com/ckfinder/userfiles/files/27850015559.pdfIn PDF document text
    • http://condosworld.com/abisol1/userfiles/files/78965629863.pdfIn PDF document text
    • https://ewastexperts.com/userfiles/files/10114673315.pdfIn PDF document text
    • http://am-assets.com/aom/magnolia/userfiles/file/segulisog.pdfIn PDF document text
    • https://pabausa.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a1a521a0f89---gusoponawe.pdfIn PDF document text
    • https://dipinkrishna.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607acc5a71678---xituxijiviwodamunovebek.pdfIn PDF document text
    • https://www.caesarstravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b4107b24eae---bawopad.pdfIn PDF document text
    • https://loskutova.site/wp-content/plugins/super-forms/uploads/php/files/93ea09df7a2d5c0d7eafef6f0b190287/5373654197.pdfIn PDF document text
    • https://takeorders.online/wp-content/plugins/super-forms/uploads/php/files/lh543re83c48s3884chjvhebdr/48621330323.pdfIn PDF document text
    • https://detectiveoffice.net/userfiles/file/papatovorajebut.pdfIn PDF document text
    • https://www.dishdivvy.com/wp-content/plugins/super-forms/uploads/php/files/97406b938881f6e6bd0647cef5f5d0a0/51840860263.pdfIn PDF document text
    • http://fulepmark.hu/nyebu/fulepmark/userfiles/file/pokigawewumadabovutoju.pdfIn PDF document text
    • https://hotelritariccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/16080464bef9cc---75402055066.pdfIn PDF document text
    • http://podiummoda.ru/userfiles/file/48152106205.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_off00010a3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A3E 17492 bytes
SHA-256: ed8b2f54de3453991ecc66e40b94eeccea266c990a9a8396830e67612cf8f940
font_01_sfnt_off0001384b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1384B 10604 bytes
SHA-256: 12645202f826143a867910549bf07633bf94920d14f03ef92234279a6c80bb37
font_02_sfnt_off0001502c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1502C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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