Malicious PDF — malware analysis report

Static analysis result for SHA-256 39ddd02abd405fed…

MALICIOUS

PDF

77.4 KB Created: 2021-09-24 21:45:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 95a1302aba301c6c571a3b3f64be4e90 SHA-1: 6b75f2cbf25f348dc9d93b67cc8f8b0b0ba24df9 SHA-256: 39ddd02abd405fed2053f7fa2224e67fb70318f4f15907bf57ae5715cd39bc34
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. The embedded JavaScript is likely used to facilitate the redirection or obfuscate the malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://crewmak.ru/uplcv?utm_term=instagram+auto+followers+and+likes+apk+download PDF link annotation
    • http://irollee.com/userfiles/file/88679280703.pdfIn PDF document text
    • https://musikkursus.dk/userfiles/file/50397509627.pdfIn PDF document text
    • https://spencershaulageltd.co.uk/wp-content/plugins/super-forms/uploads/php/files/81b83e4ed86dc53c3bea013c1aa25434/zudilegimulapupafuwe.pdfIn PDF document text
    • https://rallstarawards.us/nbloom/fckuploads/file/8360048329.pdfIn PDF document text
    • http://jiuxingchaoshi.com/uploads/file/160115033654.pdfIn PDF document text
    • http://tiszaladany.hu/upload/file/sikawitefuripojokoke.pdfIn PDF document text
    • https://promenade-perpignan.com/userfiles/file/bisunufonuxizezoxa.pdfIn PDF document text
    • http://lichnyiybrand.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16141e10aad831---zijegavisopabomamitojon.pdfIn PDF document text
    • http://leicesterbiketec.com/userfiles/file/41862328411.pdfIn PDF document text
    • https://tinnituskozpont.hu/files/naxuropozaki.pdfIn PDF document text
    • https://dycmc.com/DATA/upload/files/202109021555531020.pdfIn PDF document text
    • http://e-sportis.com/images/upload/fuwakimisawidotufiwudu.pdfIn PDF document text
    • https://mcq.bmtinhoc.vn/InteriorWeb/images/images_news/files/76705896437.pdfIn PDF document text
    • http://hefei.chinatupai.com/web/js/ckfinder/userfiles/files/62810450239.pdfIn PDF document text
    • https://ikansambel.com/contents/files/8520014971.pdfIn PDF document text
    • http://drzwiukryte.pl/userfiles/file/vodovomabo.pdfIn PDF document text
    • http://dolphinkorea.com/files/files/20553536517.pdfIn PDF document text
    • http://tplustech.com/images/ckeditor/files/37001407140.pdfIn PDF document text
    • http://www.advancedevents.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1614a0016e4d4f---90465599026.pdfIn PDF document text
    • http://ginzaramen.us/uploads/files/fitukozawokokilebifok.pdfIn PDF document text
    • https://spherule.org/wp-content/plugins/super-forms/uploads/php/files/rsst0e6o4vapsphnp80coheq80/bulefizelebax.pdfIn PDF document text
    • http://hosungtour.net/FileData/ckfinder/files/20210919_93B7E3B2A552022F.pdfIn PDF document text
    • 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_off0000bff8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBFF8 11072 bytes
SHA-256: 1ae98c9617f0c3f3da4e95195098839ae27b5d3165b38d96b5fd8c1297082bee
font_01_sfnt_off0000d995.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD995 19880 bytes
SHA-256: 9e6fee9096a5dfcf05d00cc45984bb8b8ee481bbacd3ed1b4bbf14e545169ef1
font_02_sfnt_off00010da5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DA5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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