Malicious PDF — malware analysis report

Static analysis result for SHA-256 83efc74f8be6c761…

MALICIOUS

PDF

68.1 KB Created: 2021-09-25 13:21:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 55acd5800a951e894ad3ede65be5d38b SHA-1: 51fee41a6b3aa84dc218206d2464f79a0e301ec4 SHA-256: 83efc74f8be6c761fb497b7b572e9c6ead522c85964177ee1abd2c069fb546d5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs that form a link farm, suggesting a phishing or malware distribution attempt. The presence of a ClamAV detection for 'Pdf.Phishing.Trojan' and ML classifier flagging further supports malicious intent. The URLs point to various domains, some of which are associated with compromised WordPress installations, indicating a tactic to host malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://catamma.ru/uplcv?utm_term=download+cops+n+robbers+mod+apk PDF link annotation
    • http://tourbusan.net/FileData/ckfinder/files/20210906_86AF9C0A30778E0E.pdfIn PDF document text
    • http://sahrugs.com/userfiles/file/8190055646.pdfIn PDF document text
    • http://tinhdaurosa.com/Images_upload/files/54283794173.pdfIn PDF document text
    • https://remini.hu/userfiles/file/30877330065.pdfIn PDF document text
    • http://megamento.com/_UploadFile/Images/file/ruwewape.pdfIn PDF document text
    • http://svaz-podnikani.cz/files/file/mofugomidobelegijanito.pdfIn PDF document text
    • http://nasledie-sluck.by/var/upload/file/79248231775.pdfIn PDF document text
    • https://eclipsetheaters.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f76470a43b---35206682205.pdfIn PDF document text
    • http://nuovartea.eu/userfiles/files/30306090014.pdfIn PDF document text
    • http://93564497.com/userfiles/sinagekofogojofof.pdfIn PDF document text
    • https://harpethvalleypto.org/wp-content/plugins/super-forms/uploads/php/files/d17fc7f5fc8184ad0a62de21f032bd00/15786920922.pdfIn PDF document text
    • http://lasantitosrestaurant.com/userfiles/file/49779838802.pdfIn PDF document text
    • http://dastone.ru/userfiles/file/toxolegazewijow.pdfIn PDF document text
    • http://www.sparkprototypes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613fe0528df71---57550174988.pdfIn PDF document text
    • https://sbmhavacilik.com/userfiles/file/94854724413.pdfIn PDF document text
    • https://www.infratechgroep.nl/wp-content/plugins/super-forms/uploads/php/files/8cfcbf52d59de9a38426f2b7f6cb21a5/58229684996.pdfIn PDF document text
    • https://topconta.ro/userfiles/file/73173594775.pdfIn PDF document text
    • http://eg-connect.com/php_codes/Scott/VieauAssociates/code/userfiles/file/78335902069.pdfIn PDF document text
    • http://gurmanosypsnys.lt/userfiles/file/fuxer.pdfIn PDF document text
    • http://xn--12cm8caae5d9a0a0a1dxk6dd.com/user_img/files/18777828401.pdfIn PDF document text
    • https://dd-inside.de/userfile/file/12707629418.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_off0000ac22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAC22 15220 bytes
SHA-256: 09342fed35248c7fa7b7ec005002607b15d4fba69cbfcf270b0f4a7492c051ef
font_01_sfnt_off0000d2ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2AB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000eac2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAC2 10804 bytes
SHA-256: 6335d03bbeb33dc61048c96a58bb75a65e7df9e001fa8d455be561162fc024a0