Malicious PDF — malware analysis report

Static analysis result for SHA-256 93d688b5a79d49cc…

MALICIOUS

PDF

73.8 KB Created: 2021-08-23 13:32:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: c78e03bd2af554feca22cfb8182660c2 SHA-1: 392c8f0d0ebed429e2cf5bbb09fb564ca34ab42b SHA-256: 93d688b5a79d49ccc5634772889fad87b14c5f913deaa07197c761f5856df306
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links to external websites, many of which are hosted on compromised WordPress sites or disposable domains, suggesting a phishing or malware distribution scheme. The PDF structure itself is also indicative of a link farm designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://floorco.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/715bd4e4f3df08b8275566dbed2ebed9/gudux.pdf In PDF document text
    • https://mediaget.ru/userfiles/files/831388425.pdfIn PDF document text
    • https://www.ideaklinikkadikoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c89e89c864c---88637152063.pdfIn PDF document text
    • http://amblesidewindermere.ca/fckuploads/images/file/84909899497.pdfIn PDF document text
    • https://aspirans.com/files/file/25226879309.pdfIn PDF document text
    • http://damnoen.com/ckfinder/pho/files/53650466350.pdfIn PDF document text
    • https://www.getfitcrew.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608bbfe839660---nebaz.pdfIn PDF document text
    • http://www.megasaludips.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d6a2ff11785---63877726559.pdfIn PDF document text
    • http://cuacuonanbinh.com/userfiles/file/gajitifuzubofobuge.pdfIn PDF document text
    • http://munsusa.org/userfiles/file/20210726200245.pdfIn PDF document text
    • http://www.fullmooneye.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610dd83b46e30---73596059996.pdfIn PDF document text
    • https://leo-translate.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/1608b593ac3d5a---67416834147.pdfIn PDF document text
    • https://www.sacproblemleri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160897dfd4fc50---rekupudagegusoto.pdfIn PDF document text
    • https://carthink.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607fb3324eeb6---58594123236.pdfIn PDF document text
    • https://gulceoyunlar.com/calisma2/files/uploads/nuzivagaruzaw.pdfIn PDF document text
    • https://ienter.bg/files/5852461523.pdfIn PDF document text
    • http://wagnerpc.com/userfiles/files/kafojudedidubogobusevujam.pdfIn PDF document text
    • https://movesforfree.com/wp-content/plugins/super-forms/uploads/php/files/rro0pbkqtq3pp6naiq6vlu05i4/94551516268.pdfIn PDF document text
    • http://nd-58.ru/wp-content/plugins/super-forms/uploads/php/files/dc067fc9bc26cfc7f5fb028023f21709/38074771211.pdfIn PDF document text
    • http://www.tenniscanberra.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160cedb3e43e41---62306881908.pdfIn PDF document text
    • http://simonhoirup.dk/userfiles/file/39444613160.pdfIn PDF document text
    • https://expeditions-travel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071ca76eba5f---43323943831.pdfIn PDF document text
    • http://delawaretravelmedicine.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095b600b4077---nitugezivomovebafe.pdfIn PDF document text
    • http://studiotecnicoprato.eu/userfiles/files/16695173016.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=answers+to+glencoe+physical+science+bookPDF 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_off0000bed7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBED7 11068 bytes
SHA-256: be70a363f2cc59fa2fc4f55f20388591b20a9a09ab75770b599eb3c8893b8f01
font_01_sfnt_off0000d86f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD86F 15924 bytes
SHA-256: 9a3abdb59cd024aef5bf79f443924bb8688f332dfdc2113eb4a3310418638c63
font_02_sfnt_off00010138.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10138 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1