Malicious PDF — malware analysis report

Static analysis result for SHA-256 c70a9273d9ca431d…

MALICIOUS

PDF

82.7 KB Created: 2021-09-13 00:36:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 66136cece8e0516174a497b7051faef4 SHA-1: 50774676f4fd7c6a134b25fbbf2ea51afcf8250f SHA-256: c70a9273d9ca431d0b7d4d16250952de34dcae4700e56c2818047966036151a3
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains embedded JavaScript and a large number of external links, many pointing to disposable hosting or compromised WordPress sites, suggesting it's used to redirect users to phishing or malware download pages. The presence of embedded JavaScript indicates an attempt to execute code within the PDF viewer.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://g-stampo.com/pics/pages/file/82773581133.pdf In PDF document text
    • http://wisdomtours.net/upload/file/tusoredi.pdfIn PDF document text
    • https://hsse.hssanesteban.cl/files/80583049264.pdfIn PDF document text
    • http://twtime.com/uploads/files/202109070516541842.pdfIn PDF document text
    • http://wawa757.com/uploads/files/nufovelat.pdfIn PDF document text
    • https://izyskately.ru/foto/ck/files/zikaxudoraxipures.pdfIn PDF document text
    • http://cathugo-yachts.de/res/wysiwyg/file/45929947249.pdfIn PDF document text
    • https://darshanam.com/ckfinder/userfiles/files/75834181529.pdfIn PDF document text
    • https://hopefor.today/wp-content/plugins/super-forms/uploads/php/files/1df377b95508fafba2575a402ab90768/13781437354.pdfIn PDF document text
    • http://cjcounsel.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/bitibezu.pdfIn PDF document text
    • http://freestyler.cz/img/file/tuduvawubogazubaterozor.pdfIn PDF document text
    • http://girlstown.org/files/js/ckfinder/userfiles/files/tuwaxewukodubalogidoxikab.pdfIn PDF document text
    • http://pluimveebeurs.com/userfiles/file/12335743703.pdfIn PDF document text
    • http://studiofapas.it/userfiles/files/pexeduwabinofedeninosi.pdfIn PDF document text
    • https://widepolymers.com/userfiles/file/90402142574.pdfIn PDF document text
    • https://olgunbey.com/upload/ckfinder/files/tawurizabuwizirob.pdfIn PDF document text
    • https://humantouchtranslations.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/161391b501a8ba---nemilipilijetipudo.pdfIn PDF document text
    • http://www.como-grup.ro/fisiere/file/tibaluvoxifawunutugod.pdfIn PDF document text
    • http://greensquares.in/userfiles/file///66239431657.pdfIn PDF document text
    • http://cayxaotamphan.net/userfiles/image/file/pafamuje.pdfIn PDF document text
    • https://www.truesdalepainting.com/wp-content/plugins/formcraft/file-upload/server/content/files/161396e10645fa---xelatukujosuvakulotifipu.pdfIn PDF document text
    • https://www.inkfactory.pk/wp-content/plugins/formcraft/file-upload/server/content/files/16133f12c1d712---jafejitu.pdfIn PDF document text
    • http://systemsbiology.at/uploads/assets/file/59242575846.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=mx+player+pro+cracked+2021PDF 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_off0000dd3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD3E 10640 bytes
SHA-256: 6d845cc31517455b073d6acf83f7b6711f0dea9a42f331a9c8e1321e4cc15b19
font_01_sfnt_off0000f5da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5DA 18136 bytes
SHA-256: 0f80cbab25831fab28d93cd7e9005aa99f169458a1ade1d60fc69760f1f2a5ef
font_02_sfnt_off0001254d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1254D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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