Malicious PDF — malware analysis report

Static analysis result for SHA-256 3f31a1136712b2c4…

MALICIOUS

PDF

74.4 KB Created: 2021-09-06 07:06:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 6d1006f8c8498faa6d73065993643aa7 SHA-1: 0e74d2d2f0e2490dd6f305228c970c661f622cfc SHA-256: 3f31a1136712b2c445d82b2a95c1b5fa02fbf75e8cfceadbf82381ca0e95e51f
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to numerous external URLs, some hosted on compromised WordPress sites. The primary purpose appears to be directing users to potentially malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://suseefinance.com/userfiles/file/tonud.pdf In PDF document text
    • https://useoneconvo.com/wp-content/plugins/super-forms/uploads/php/files/2fa63fbc62381394ba0024aaa33af022/xofazitoxogebota.pdfIn PDF document text
    • http://playeasypiano.com/resources/fck_images/46000964031.pdfIn PDF document text
    • https://humantouchtranslations.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/160da7061656d3---rowaduvuvubu.pdfIn PDF document text
    • https://vetregistr.com/ckfinder/userfiles/files/buzorodewebadewiralebisos.pdfIn PDF document text
    • https://criteriacambio.com.br/wp-content/plugins/super-forms/uploads/php/files/f03uejflbs143t3plhbfg0q1s1/23003254942.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f2fa3479a6a---kebof.pdfIn PDF document text
    • http://www.nisbd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160787e498ed61---fososapezope.pdfIn PDF document text
    • http://bumsnab.ru/uploads/files/47326489709.pdfIn PDF document text
    • http://lab4050.com/upload/editor/file/zusonikosax.pdfIn PDF document text
    • https://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/050dabb987a9a5565d0159623e61e060/rolimalix.pdfIn PDF document text
    • http://e-skala.pl/userfiles/file/mebisinonosenevufaneze.pdfIn PDF document text
    • https://fiberglasssupplydepot.com/userfiles/file/20887934544.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/712476fc6c840126672ad1ce49547d49/75037240400.pdfIn PDF document text
    • http://bajcsidavidfoto.com/_user/file/64771104887.pdfIn PDF document text
    • https://www.kiteschule-kiel.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608695212faa6---95765331231.pdfIn PDF document text
    • http://raegcafe.com/uploads/files/6383314994.pdfIn PDF document text
    • https://media-get.ru/userfiles/files/21999197990.pdfIn PDF document text
    • http://atlantichomeportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/160770ea2d3ca4---wexafexujokuvizurelu.pdfIn PDF document text
    • https://spbmworld.com/anaeter_capital/siteadmin/userfiles/files/garimulerazizabobomi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=cm+1+ton+manual+chain+hoistPDF 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_off0000be85.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBE85 17788 bytes
SHA-256: 3132fb3f2221cb2ab31e066a8f94fb66880ff834be04169df8f4d6504926cce0
font_01_sfnt_off0000ec68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC68 10444 bytes
SHA-256: 85105b1b9753f2790dceca3aaf48dd0cc7c783f58ae1124f45c181d8adc492aa
font_02_sfnt_off000103f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103F4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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