Malicious PDF — malware analysis report

Static analysis result for SHA-256 9dcecaa85ccd2241…

MALICIOUS

PDF

86.1 KB Created: 2021-09-17 11:55:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: fd4ffe2397406c951a9c6a9222649316 SHA-1: 26d6b1ab0de4730743c68ba5df8febe8bf42ee5b SHA-256: 9dcecaa85ccd2241e187970f237fbbeef7274ab39b7a296883a67a853ebd2812
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a malicious document, potentially leveraging JavaScript for exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 6

  • 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.
  • 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://emrc.ie/upload/imagecontent/file/585566706.pdf In PDF document text
    • http://hindel-relax.ch/ckfinder/userfiles/files/fasixubex.pdfIn PDF document text
    • http://radiopoint.cz/userfiles/file/tevatalasarogomi.pdfIn PDF document text
    • http://gachbinhduong.com/upload/file/9116392197.pdfIn PDF document text
    • http://rayanchem.com/d/files/31229494574.pdfIn PDF document text
    • http://rlangkhan.com/upload/userfiles/files/wubisogatuxuwonokodow.pdfIn PDF document text
    • https://baxsporthorses.nl/userfiles/file/muwivaninegoviremugedefub.pdfIn PDF document text
    • http://novehorizonty.sk/userfiles/file/41414124080.pdfIn PDF document text
    • http://frederickfollows.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16130cf1a69893---wavejipisavavitusoxidita.pdfIn PDF document text
    • http://biometria.pl/photos_fck/file/96699133058.pdfIn PDF document text
    • https://biomisszio.hu/tmp/46490405363.pdfIn PDF document text
    • https://edusfera.pl/upload/file/36009097672.pdfIn PDF document text
    • https://sistemagestiondpr.co/userfiles/file/49669557830.pdfIn PDF document text
    • https://kalatranslation.co.uk/wp-content/plugins/super-forms/uploads/php/files/ovi6uau1aor57v7jg6vggs78te/toragus.pdfIn PDF document text
    • http://mjengo.org/FCKeditor/editor/filemanager/connectors/php/connector.php?Command=FileUpload&Type=File&CurrentFolder=%2Ffile/12736368675.pdfIn PDF document text
    • https://www.chablis-gautherin.com/ckfinder/userfiles/files/towabanajijuzelejilawam.pdfIn PDF document text
    • http://sambometal.com/dataroom/file/lojarakoxula.pdfIn PDF document text
    • http://cuanhuadanang.vn/uploads/image/files/4469003753.pdfIn PDF document text
    • https://promobryansk.ru/userfiles/files/62861253167.pdfIn PDF document text
    • http://zabbeleecooking.com/ckfinder/userfiles/files/27267081518.pdfIn PDF document text
    • http://studiogeologicotrilobite.com/userfiles/files/91821297410.pdfIn PDF document text
    • http://police8coop.com/UserFiles/file/71269964404.pdfIn PDF document text
    • https://goactive.hu/wp-content/plugins/super-forms/uploads/php/files/b0ef9b097d49386e2ae2c1d3a365c0f6/duligojozuton.pdfIn PDF document text
    • http://jingluo.net/uploadfiles/files/fubejukizuj.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=cut+and+paste+face+app+androidPDF 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_off0000ed7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED7B 17280 bytes
SHA-256: af829cb5c7d06cc293baedd1052125aee6f41903d853b25342ecf61f5ad3cc55
font_01_sfnt_off00011a17.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A17 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001322e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1322E 10700 bytes
SHA-256: 61f56db12f999901d88de79980323698066d28ae3f9b10a1ae5fc9bffa11d540

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