Malicious PDF — malware analysis report

Static analysis result for SHA-256 ca6aaf7e53709747…

MALICIOUS

PDF

93.2 KB Created: 2021-07-26 02:00:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 2326af12ccfc2892439df630118552fe SHA-1: f1c44bf4e92776af588d2865fec9037bae5e693e SHA-256: ca6aaf7e53709747fb8d22d016c6e63b7992253e430beb1bf8ddd57f58fc2025
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 CMS upload directories. Heuristics indicate this is a link farm on disposable hosting, and ClamAV detected it as a phishing trojan. The primary function appears to be directing users to malicious content hosted on these compromised sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9866

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 http://pebyte.com/wp-content/plugins/super-forms/uploads/php/files/8iup287vthd7o89nlj4hpobtd4/83713255438.pdf In PDF document text
    • https://bykevin.com/wp-content/plugins/super-forms/uploads/php/files/31cf45a38ebcf8744532c7ece74f2f0e/futixubamupufilarinomanub.pdfIn PDF document text
    • http://redwoodpwr.com/wp-content/plugins/super-forms/uploads/php/files/74ge2lrv79afh80e9n36t9o0i7/mozimemepobebugi.pdfIn PDF document text
    • http://historia-bfured.hu/userfiles/file/jukiroradojakirex.pdfIn PDF document text
    • http://grani-tonkogo-mira.ru/wp-content/plugins/super-forms/uploads/php/files/b66a05462b5223147bd0af25d5dcef07/xowiga.pdfIn PDF document text
    • https://bf-pomosch.ru/wp-content/plugins/super-forms/uploads/php/files/mvsg3ler9ah9bv3540rcklqos4/46933435337.pdfIn PDF document text
    • http://www.uvhk.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aeeb0730688---pamenavopek.pdfIn PDF document text
    • https://advancedbusiness.co/wp-content/plugins/super-forms/uploads/php/files/e624a0ce9029a3adab80329d45f084e0/44010721508.pdfIn PDF document text
    • https://www.mercato.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160c6a7ac400c3---34867107804.pdfIn PDF document text
    • http://lalitas-thaimassage-spa.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607c271fa2b99---tikagupinemebaduja.pdfIn PDF document text
    • http://kvbm.org/pds/userfiles/files/75210475760.pdfIn PDF document text
    • http://www.communityheroesproject.org/wp-content/plugins/formcraft/file-upload/server/content/files/160be2ac573468---sajutefulabekaxodube.pdfIn PDF document text
    • https://www.ayersworthglen.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f17811a333---matisirozapete.pdfIn PDF document text
    • http://localhomesales.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160e6136eadffd---toterijawidugexatat.pdfIn PDF document text
    • http://lesbambousbleus.fr/ckeditor/upload/files/99802669217.pdfIn PDF document text
    • https://controlcert.se/wp-content/plugins/formcraft/file-upload/server/content/files/160e1592bd9082---zubati.pdfIn PDF document text
    • https://vallejardin.com/wp-content/plugins/super-forms/uploads/php/files/4f2d873f3bab31e8c33b519971886634/61877195288.pdfIn PDF document text
    • http://www.jcca.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/1609f81cb03210---6932016276.pdfIn PDF document text
    • http://amoy-art.com/Upload/file/bawafelevekoli.pdfIn PDF document text
    • https://aliencosmicexpo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f5585a3117---divijebikamukelirax.pdfIn PDF document text
    • https://www.booster-p.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ffca4b60d1---zegaxixiteruj.pdfIn PDF document text
    • http://hzbmsj.net/images/upload/File/dalerijaser.pdfIn PDF document text
    • http://rheumatology.institute/upload/content/file/81107643178.pdfIn PDF document text
    • https://www.financedeclined.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160d4d8deca01b---moloviropolinatofok.pdfIn PDF document text
    • http://suportti.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608fee45e0b28---12819307128.pdfIn PDF document text
    • http://sparan-art.ru/ckfinder/userfiles/files/jolafubizawomesavikokiba.pdfIn PDF document text
    • http://mebco.ru/images/file/67319710881.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=lesson+3+ratifying+the+constitution+answer+keyPDF 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_off0001071d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1071D 11092 bytes
SHA-256: 123ef97791bcf3b531b49b17db224ea75297da5600c8da6a9d55595390b90a3e
font_01_sfnt_off0001211e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1211E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013930.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13930 16996 bytes
SHA-256: 981695732b3b53e389ba56a7cda585281f063b1125c558c17e80d912441c16ab

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