Malicious PDF — malware analysis report

Static analysis result for SHA-256 e2fb41c8a3e90436…

MALICIOUS

PDF

100.4 KB Created: 2021-09-01 01:54:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 16ac80b004c46947f4d3ef3c6d7c91ac SHA-1: 3550857d4937584696b2b80e14fd7ec84eaaa722 SHA-256: e2fb41c8a3e904369b207d690753d1b09d970fc5299037354d096a55e9bf2f98
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript, which is a common technique for exploiting vulnerabilities or delivering malicious content. The PDF also features a link farm pointing to compromised WordPress sites and other disposable hosting, suggesting an attempt to obscure the final malicious destination. ClamAV detection and ML classification further support its malicious nature, likely as a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9881

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 https://heatingboiler.ca/fck_upload/file/29452071238.pdf In PDF document text
    • http://aberdeeneyes.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160883ccc1182f---fituwikesulanevizuluj.pdfIn PDF document text
    • http://zatoodesign.com/userfiles/files/31662104675.pdfIn PDF document text
    • https://precisionautoandac.com/wp-content/plugins/super-forms/uploads/php/files/4994b492d83b7516406106de5e5c9579/vekatutatorej.pdfIn PDF document text
    • http://daydreamspin.com/userfiles/file/zizugawinutepezuwaloj.pdfIn PDF document text
    • http://akbmodel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c72b1b25a51---didobuwim.pdfIn PDF document text
    • https://gites-les-bardots.com/userfiles/file/8664253603.pdfIn PDF document text
    • https://nationalshield-uae.com/userfiles/files/rufuxevo.pdfIn PDF document text
    • https://expungemyrecordnj.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610fd6a2f1f97---fugezop.pdfIn PDF document text
    • http://asdgolfclubtoscana.com/writable/public/userfiles/file/latafuberuz.pdfIn PDF document text
    • https://pyhm.ca/wp-content/plugins/super-forms/uploads/php/files/dvojv1p4cs4bjf48338pc4vdm9/6973866245.pdfIn PDF document text
    • http://riversedgefm.com/files/file/jedizizusaridijupune.pdfIn PDF document text
    • https://dianthusindustrial.com/resimler/files/64066202087.pdfIn PDF document text
    • https://trungtammatnamviet.vn/upload/files/41828736453.pdfIn PDF document text
    • http://aodaibooking.com/FileData/ckfinder/files/20210730_5344A14331556F37.pdfIn PDF document text
    • http://www.nationaalgolfcongres.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16094485bc6445---nivuteweputawiw.pdfIn PDF document text
    • https://almondzwealth.com/administrator/imagetemp/file/44610122888.pdfIn PDF document text
    • https://chameleoncoupons.com/adgprocessing/uploads/files/78834642767.pdfIn PDF document text
    • https://forssh.com/userfiles/file/vutajamowinijotimexepox.pdfIn PDF document text
    • http://www.skup.it/wp-content/plugins/formcraft/file-upload/server/content/files/16075510a9f432---31595310283.pdfIn PDF document text
    • http://cbelmira.com/wp-content/plugins/super-forms/uploads/php/files/cedfd4e5509d7b961b03ed8f506ba9a4/51414923430.pdfIn PDF document text
    • http://jonkmp.nl/img/cms/file/pufinej.pdfIn PDF document text
    • http://sarica.com.tr/ckfinder/userfiles/files/datadoxokokimabo.pdfIn PDF document text
    • https://topinsolventa.ro/userfiles/file/45833984737.pdfIn PDF document text
    • https://chachachat.info/js/ckfinder/userfiles/files/29647072995.pdfIn PDF document text
    • http://afghansolar.com/userfiles/file/darubiridafesopim.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=greater+community+bible+tabernaclePDF 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_off00012318.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12318 18276 bytes
SHA-256: 6b6ea505ff565c4a18ab6de65660f3342894736d57f4c0868d2b59cff25213fe
font_01_sfnt_off000151ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x151EE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00016a05.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16A05 10616 bytes
SHA-256: 6c4621e3b119d7c97857a2f9256ada27887284a77a90e056f3ff2aec3eb3fc44

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