Malicious PDF — malware analysis report

Static analysis result for SHA-256 77ccb9ae579a1f95…

MALICIOUS

PDF

74.3 KB Created: 2021-09-16 19:23:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 55db50ef112c86763f751ce7f1cbdbc5 SHA-1: 926ec66c7522073cf645ce87d5b9fa80fb9b0627 SHA-256: 77ccb9ae579a1f95042c33c78b99d8e0f0e65914c54883822356a2c232c714be
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs that point to various domains, suggesting it functions as a link farm designed to redirect users to potentially harmful content. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports this, indicating the document is structured to host many links on disposable hosting. No scripts were extracted, but the presence of multiple external URIs and the overall structure point towards a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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 https://irlanc.ru/uplcv?utm_term=law+abiding+citizen+stream PDF link annotation
    • http://xhiehchin.com/Xhieh_News/_file/lunafuvates.pdfIn PDF document text
    • http://project-lovcen.me/userfiles/file/59894934439.pdfIn PDF document text
    • http://www.hermosabeachbungalows.com/userfiles/files/38064016624.pdfIn PDF document text
    • https://yp05.com/_UploadFile/Images/file/77928929522.pdfIn PDF document text
    • https://rieker-consulting.eu/files/file/dixowowevodonavurevigum.pdfIn PDF document text
    • http://cantinachitarra.it/userfiles/file/44212808357.pdfIn PDF document text
    • http://tysons-cafe.com/uploads/files/82461508726.pdfIn PDF document text
    • http://gruppocreta.com/userfiles/files/71550017460.pdfIn PDF document text
    • http://biemmecommerciale.eu/userfiles/files/81826888874.pdfIn PDF document text
    • http://katour.ru/admin/ckfinder/userfiles/files/tukavixanunanu.pdfIn PDF document text
    • http://dentalcenterstudio.it/userfiles/files/47695548240.pdfIn PDF document text
    • http://uekekb.ru/!upload/files/81558090803.pdfIn PDF document text
    • https://humanistbeauty.com/wp-content/plugins/super-forms/uploads/php/files/vrvh44plj3j3qmcpmabim7v87g/87448532629.pdfIn PDF document text
    • https://vpmemorial.net/images/file/72128049784.pdfIn PDF document text
    • https://imagebrandstudio.com/userfiles/file/76400364405.pdfIn PDF document text
    • http://www.angels-rest.es/ckfinder/userfiles/files/36090784160.pdfIn PDF document text
    • https://z87992961.com/upload/files/20210904140618.pdfIn PDF document text
    • http://www.mtpartnersfl.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140a8061874f---33513193131.pdfIn PDF document text
    • http://celcg.pl/uploaded/file/vajofawazoxut.pdfIn PDF document text
    • https://www.advids.co/wp-content/plugins/formcraft/file-upload/server/content/files/1613f9d9b6c9b7---zizalalebitoxuxibipavonol.pdfIn PDF document text
    • https://bf-pomosch.ru/wp-content/plugins/super-forms/uploads/php/files/cdtrvvad9u5anmtc5cr00pecs3/wunorerogedokijivijalij.pdfIn PDF document text
    • https://duvanco.be/docs/files/69197712665.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_off0000be8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBE8B 10788 bytes
SHA-256: b10904a802682b60c8fde978d8f3f791b1e0ad611913a7c0948ca773a57b0dbe
font_01_sfnt_off0000d741.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD741 17236 bytes
SHA-256: 6aaaef56d1915e4a964cde47cb84477bd7395b8ed174038c4b2c9811ffec071e
font_02_sfnt_off0001041e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1041E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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