Malicious PDF — malware analysis report

Static analysis result for SHA-256 8098a3f5aa36e1da…

MALICIOUS

PDF

80.0 KB Created: 2021-09-08 20:18:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: cd23f347c16da1c9cced6125779e5ad9 SHA-1: d107809a671611f2fda45687add05c913951595b SHA-256: 8098a3f5aa36e1da61737a0c4692f5afa2225fceb82c4f007ce428f32146b232
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous external links, many pointing to compromised websites or disposable hosting, indicating a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent, specifically identified as a phishing trojan. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a malicious document designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

Heuristics 6

  • 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.
  • 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://pixomot.ru/uplcv?utm_term=manual+source+code+review+process PDF link annotation
    • https://karlholmbygg.se/UserFiles/files/pilunagorafumuwizoke.pdfIn PDF document text
    • http://rotarybrescello.it/userfiles/files/65140515964.pdfIn PDF document text
    • https://pmapmc.com/userfiles/image/files/15604053837.pdfIn PDF document text
    • http://www.abcklima.hu/data/editorfile/84162127855.pdfIn PDF document text
    • http://ahcxdq.com/uploads/file/080509305322.pdfIn PDF document text
    • http://romangruszecki.com/uploaded/file/37312600036.pdfIn PDF document text
    • https://gresathouse.com/wp-content/plugins/super-forms/uploads/php/files/2e18cdeaf95836ef215baf87df9216c2/seruxiledo.pdfIn PDF document text
    • https://cottingham-group.com/cufiles/files/vuxezirosepojusabisevijaw.pdfIn PDF document text
    • http://jodhpurheritagewalk.com/images/file/14860368574.pdfIn PDF document text
    • http://appextskihjthj.handysociality.com/upload/files/97718130677.pdfIn PDF document text
    • http://flapboxes.com/userfiles/files/tajuwetaduriridiga.pdfIn PDF document text
    • https://vetamblj.si/ckfinder/userfiles/files/xutumemolipapip.pdfIn PDF document text
    • https://littleedupark.com/ckfinder/userfiles/files/40755900950.pdfIn PDF document text
    • https://artistprasanna.com/userfiles/file/40694628896.pdfIn PDF document text
    • http://zamgph.com/FCKeditor/editor/filemanager/connectors/php/uploads/file/021244399070.pdfIn PDF document text
    • http://shceping.com/upFile/photos/2021-9/file/28221534145.pdfIn PDF document text
    • http://alltechsro.cz/files/98281011156.pdfIn PDF document text
    • http://www.grundys.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161383f5bbe33b---kesigufopopupovixo.pdfIn PDF document text
    • https://dailyiat.com/html_upload/file/lanajeput.pdfIn PDF document text
    • https://mindweave.co.uk/wp-content/plugins/super-forms/uploads/php/files/uu3eemhgv5sftuerk44ihcgn9t/26749474700.pdfIn PDF document text
    • https://lotte-ppta.net/beta/assets/file/14815559634.pdfIn PDF document text
    • http://wooshin.kr/uploaded/file/238754638613223e475af9.pdfIn PDF document text
    • https://swotin.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133b7f37d4e5---gulomepubogapinav.pdfIn PDF document text
    • http://sk4education.com/ckfinder/userfiles/files/1349864945.pdfIn PDF document text
    • http://www.stockholmswingallstars.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613713d95d80b---76748224518.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_off0000d6b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6B5 16900 bytes
SHA-256: 512b130d14e0134fbd6fbd98cd0878f47c5ee3310924513a5410cd168a6be779
font_01_sfnt_off00010230.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10230 10652 bytes
SHA-256: 9335cb1c45f0aed3bb0b26f137fe29a839f476aacac2bdb49126d4c4f2542554
font_02_sfnt_off00011ab6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AB6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1