Malicious PDF — malware analysis report

Static analysis result for SHA-256 42a142b79e28539c…

MALICIOUS

PDF

72.0 KB Created: 2021-09-08 08:46:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 0a4d2108f23441f1b917a9a066fbb353 SHA-1: 0eb9473a7854abb4c3a1ce968ceebc71b38c7b84 SHA-256: 42a142b79e28539c0e3b28862d0b6e5895d1f65b9770cae0a7b715dde01dccd6
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 malicious documents. It hosts a link farm pointing to numerous URLs, many of which are on compromised WordPress sites, suggesting an attempt to distribute further malicious content or conduct phishing. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

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://nasikampung.info/contents//files/gavadejemamabolus.pdf In PDF document text
    • https://grandplaza.bg/uploads/assets/file/fitutekavarelumebadizu.pdfIn PDF document text
    • https://arizonapoolcontractor.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abd2946d214---juwovewawosujofu.pdfIn PDF document text
    • http://mlsy.cz/images/file/files/14618144622.pdfIn PDF document text
    • https://www.ferienhof-schneider.de/wp-content/plugins/formcraft/file-upload/server/content/files/16128c6b395beb---9458936682.pdfIn PDF document text
    • https://transilvaniafishing.ro/app/webroot/files/userfiles/files/gerekarivin.pdfIn PDF document text
    • http://28777886.com/Lpf/UPFILE/userfiles/files/pimusesisegezisakukoj.pdfIn PDF document text
    • http://jamoncup.es/wp-content/plugins/formcraft/file-upload/server/content/files/1612a35c02607e---25451704711.pdfIn PDF document text
    • http://airmon.hu/images/files/guriretojenisesukizotuma.pdfIn PDF document text
    • http://print-resource.co.uk/ckfinder/userfiles/files/maxumijobezig.pdfIn PDF document text
    • https://wscnaturalhealings.com/wp-content/plugins/super-forms/uploads/php/files/3bc01c5e7832236d79f25bdf693c0962/51809708313.pdfIn PDF document text
    • http://metzpaintings.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c506accc2d1---ponufegi.pdfIn PDF document text
    • http://salukool.ee/upload/userfiles/file/domeravabi.pdfIn PDF document text
    • http://thanhlamresort.vn/wp-content/plugins/formcraft/file-upload/server/content/files/160f8d0df3b1db---nugimewatibewafapigu.pdfIn PDF document text
    • https://minervatech.work/js/ckfinder/userfiles/files/34085217122.pdfIn PDF document text
    • http://metzpaintings.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a67578ca02f---wezekixosanageromexe.pdfIn PDF document text
    • http://erpsamik.com/ckfinder/userfiles/files/rozopexipegerozujapinoxum.pdfIn PDF document text
    • http://co-wemart.com/careeruserfiles/file/zufujivafura.pdfIn PDF document text
    • http://vladjurnalist.ru/archive/file/90550894196.pdfIn PDF document text
    • http://alexandersorokolaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/zozuxabexaduduzuman.pdfIn PDF document text
    • http://elm3rad.com/file/72475279248.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=list+of+human+body+parts+pdfPDF 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_off0000b98e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB98E 10896 bytes
SHA-256: 44f3ad8629bc1f3335e78d969da9ffae6f195edb8bbb44d736b505a679e4d208
font_01_sfnt_off0000d257.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD257 15688 bytes
SHA-256: ceb7467d38b3af6b3b8d27b9b3c5d18c658d731f834c35dec105af0512c285f4
font_02_sfnt_off0000fa84.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA84 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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