Malicious PDF — malware analysis report

Static analysis result for SHA-256 3aa17c4fc843ffb6…

MALICIOUS

PDF

82.0 KB Created: 2021-10-12 05:26:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 4b54edc3925d9990b263758a3684b320 SHA-1: 7a9bede6d07e34a5cc17fcd0d87bf588d64ca314 SHA-256: 3aa17c4fc843ffb692958f8c3d8ab7ee4c167b6472de4c63acb5ba1d410bb565
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file flagged by ClamAV as a phishing trojan and by an ML classifier as malicious. It contains embedded JavaScript, which is often used to exploit PDF vulnerabilities or redirect users. The presence of a link farm pointing to compromised WordPress upload storage suggests an attempt to host or distribute malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://churchliferesources.org/wp-content/plugins/formcraft/file-upload/server/content/files/1614bf643ac8d9---54481963257.pdf In PDF document text
    • http://spellenindex.nl/images/uploads/galig.pdfIn PDF document text
    • http://szao-spb.ru/images/news/file/wobotovi.pdfIn PDF document text
    • https://vidaleve.ind.br/ckfinder/userfiles/files/bizijemivuxanuzivoxot.pdfIn PDF document text
    • http://lagostena.it/userfiles/files/12683828268.pdfIn PDF document text
    • https://arerp.kr/data/file///91595850127.pdfIn PDF document text
    • http://www.kotolantopeni.cz/files/79230432292.pdfIn PDF document text
    • http://xn--or3bo5mvlb.com/data/editor/file/xanoxexolip.pdfIn PDF document text
    • http://kuryakyn.ru/userfiles/file/jupedimiwedewusexe.pdfIn PDF document text
    • http://thanuyentea.com/ckfinder/userfiles/files/89205970062.pdfIn PDF document text
    • http://dsagco.com/Upload/file/zogotuwasizimabadi.pdfIn PDF document text
    • http://zensushialiso.com/uploads/files/tufapapax.pdfIn PDF document text
    • https://www.horisunmauritius.com/wp-content/plugins/super-forms/uploads/php/files/bb52d7a2806de6694f867e51f92fd3bf/jiguseki.pdfIn PDF document text
    • https://esperanzadeavila.com/fotos/file/mamifujarabegumagal.pdfIn PDF document text
    • http://csc0512.com/userfiles/file/20210902215150_a61de3.pdfIn PDF document text
    • https://bonekarusa.com/contents/files/1322485836.pdfIn PDF document text
    • https://www.breastcancerfoundation.in/wp-content/plugins/super-forms/uploads/php/files/78a2ee2fe2ff61266e94a40575be6da0/lifufavamekose.pdfIn PDF document text
    • https://dukumanis.com/contents/files/62001495267.pdfIn PDF document text
    • https://moraure.net/js/ckfinder/userfiles/files/64682647704.pdfIn PDF document text
    • http://www.prodomasa.com/ckfinder/userfiles/files/punugake.pdfIn PDF document text
    • https://granitabrasive.com/editor_up/zizetixajimazaweposidaf.pdfIn PDF document text
    • https://lmcmanager.com/ckfinder/userfiles/files/saxexusefu.pdfIn PDF document text
    • http://puzynowska-kancelaria.com/userfiles/file/nutuzowijijasumo.pdfIn PDF document text
    • http://oldmotorsclub.com/files/file/8300201145.pdfIn PDF document text
    • http://feedproxy.google.com/~r/MbOu/~3/23D8k0Ec_6w/uplcv?utm_term=what+is+the+definition+of+transitive+propertyPDF 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_off0000d8a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8A2 18680 bytes
SHA-256: 48eea2e9cd309eb779d4cb09f58dadd7e8f52ba959d213cafa085efedc6bb081
font_01_sfnt_off0001094a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1094A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012161.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12161 10720 bytes
SHA-256: 2efea730af2bb1e7be5b5b46eb95b2ad99725ef579d1240455aa14794468d011

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