Malicious PDF — malware analysis report

Static analysis result for SHA-256 4e02f963b77eff5c…

MALICIOUS

PDF

80.8 KB Created: 2021-09-20 08:07:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 65521140d8bedc980476c632b53abb6d SHA-1: a76e45c33c28d61e8207c9ec06d6d284191af9f5 SHA-256: 4e02f963b77eff5c77c8e341203f586045683be9a11a0ecfae52859a90dfa82c
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF sample was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains embedded JavaScript and a link farm pointing to various URLs, some of which are hosted on compromised CMS uploads. The presence of embedded JavaScript suggests an attempt to execute malicious code, likely to facilitate phishing or download further payloads. The link farm further supports a phishing or redirection-based attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

Heuristics 8

  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://stsmcc.org/www/js/ckfinder/userfiles/files/38587508192.pdf In PDF document text
    • http://mpti.ru/userfiles/file/99839782015.pdfIn PDF document text
    • http://langeline.com/ckeditor/upload/files/zifavirazomo.pdfIn PDF document text
    • https://www.ideakliniksisli.com/wp-content/plugins/formcraft/file-upload/server/content/files/161357f04725c1---28330953701.pdfIn PDF document text
    • https://latework.cz/soubory/25166555750.pdfIn PDF document text
    • https://hanoihome.net/img_duhoc/files/95444131029.pdfIn PDF document text
    • http://shangrilatheshow.com/ckfinder/userfiles/files/nunubakalekizabulolagu.pdfIn PDF document text
    • http://costanzolegal.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/71193787614.pdfIn PDF document text
    • http://kaushalacademy.org/ckfinder/userfiles/files/91580519675.pdfIn PDF document text
    • http://agrion.org/upload/fichier/reritemodatisidewuvoza.pdfIn PDF document text
    • http://veewood.com/file_media/file_image/file/75014484594.pdfIn PDF document text
    • https://www.truesdalepainting.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d9b5dac00f---73656812755.pdfIn PDF document text
    • http://wawa757.com/uploads/files/43492995033.pdfIn PDF document text
    • http://we-women.de/default/files/uploads/file/80052231490.pdfIn PDF document text
    • http://www.combatsim.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1613f26c28ad5c---31259749712.pdfIn PDF document text
    • https://theptaynam.vn/upload/files/doburupepi.pdfIn PDF document text
    • http://rentaruedas.com/files/others/26672735941.pdfIn PDF document text
    • https://mikepromedia.com/wp-content/plugins/super-forms/uploads/php/files/f561a913f5757dfbd940ac225ba6b934/dedigodedidekosu.pdfIn PDF document text
    • https://kuraniterbiye.com/resimler/files/giguvusonipilopavo.pdfIn PDF document text
    • https://rsun.pro/admin/ckfinder/userfiles/files/dejazevazukarolovire.pdfIn PDF document text
    • http://www.hebrewforreadingcomprehension.com/content/domekipifawudufajatona.pdfIn PDF document text
    • http://cjpharmtech.com/upload/files/32393251774.pdfIn PDF document text
    • http://paradoxine.com/upload/files/50055396665.pdfIn PDF document text
    • https://spa-salon.ru/ckfinder/userfiles/files/palatosutasuxenunup.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=app+ymusic+apk+download+ymusicPDF 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_off0000d808.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD808 10716 bytes
SHA-256: 8ebaf189419aa02800fc211637d7d508154bbccb6a73cccf1a83cc5f1bf578dc
font_01_sfnt_off0000f0b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0B1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000108c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108C3 17536 bytes
SHA-256: 088f6fd6418e17995dd6f93ac5269ff3db5452d489480b204d08780c29854d27

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