Malicious PDF — malware analysis report

Static analysis result for SHA-256 da6739256a6fcb10…

MALICIOUS

PDF

83.9 KB Created: 2021-09-02 15:15:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: a8fd0c876b9a9b606f235fc581ac77d9 SHA-1: ece3755c0298bfb1ee53366ced71fb40b3970862 SHA-256: da6739256a6fcb10ae11797be34153607c50132008c9737c74dda1a702a0adc8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, with numerous embedded URLs pointing to potentially compromised WordPress upload directories and disposable hosting. The primary purpose appears to be directing users to external, untrusted resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://beautifullifeuk.com/wp-content/plugins/super-forms/uploads/php/files/7511aee5e852577347d0a870760378c7/zotuxalineturo.pdf In PDF document text
    • https://hunde-katzen.at/soubory/xupanabegejupisilomu.pdfIn PDF document text
    • http://xn--80aagkbrca3apkgkee0a1bi.xn--p1ai/ckfinder/userfiles/files/fowenisegazi.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16072512adbded---31653305933.pdfIn PDF document text
    • http://famcareconnect.org/wp-content/plugins/formcraft/file-upload/server/content/files/160be3359859c6---64824402055.pdfIn PDF document text
    • http://www.hkqi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080d2a54fccf---jixavoxinato.pdfIn PDF document text
    • http://ever0036.com/assets/uploads/ckedit/files/20210801054728.pdfIn PDF document text
    • http://indyskischool.com/ckfinder/userfiles/files/didaxilukivo.pdfIn PDF document text
    • http://matstravel.ru/userfiles/file/34956852278.pdfIn PDF document text
    • http://beckydavidsonhomes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c99227f3dd2---sekege.pdfIn PDF document text
    • https://afanasyev-design.ru/wp-content/plugins/super-forms/uploads/php/files/d045f384ba40e4818cd27040f8e74684/11618481001.pdfIn PDF document text
    • http://temple.mo/userfiles/file/77773957395.pdfIn PDF document text
    • https://joepromenshealth.com/wp-content/plugins/super-forms/uploads/php/files/d76544933938b61691dff681f32627bb/novim.pdfIn PDF document text
    • http://www.hydro-tg.pro/upload/file/wekomubidugepijufigebej.pdfIn PDF document text
    • https://fieldofgreen.com/wp-content/plugins/super-forms/uploads/php/files/0af176b4c507af91938eae28a419a056/67533648388.pdfIn PDF document text
    • https://solidpractise.com/files/userfiles/file/56475822545.pdfIn PDF document text
    • http://www.uppld.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609a64e058794---rokemelisesidadogitugi.pdfIn PDF document text
    • http://cosmic-kino.ru/sadm_files/17891598938.pdfIn PDF document text
    • http://pinturasoltra.com/images/slider/files/51499463928.pdfIn PDF document text
    • http://stkvn.ru/wp-content/plugins/super-forms/uploads/php/files/b96155fc2ddd042f9c5f909e42e4f876/netazonifivakuziwi.pdfIn PDF document text
    • http://decamiones.com/userfiles/file/vakibinilame.pdfIn PDF document text
    • http://bensonlandscape.com/editorData/file/gelonolunuda.pdfIn PDF document text
    • http://bmfjhjk.friend-match.com/upload/files/wazorazizolaxopavutiwame.pdfIn PDF document text
    • http://www.redactordecontenidos.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160a1c8b68d562---xozadubogokawolidid.pdfIn PDF document text
    • https://ewdel.cz/ckfinder/userfiles/files/kudowudiniduwuxagawofijaj.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=assets+held+for+sale+ifrs+5+pdfPDF 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_off0000e09a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE09A 10608 bytes
SHA-256: 15e6bd17843d2e7ac49e2db2d9a4a56a29fc761e06b71fd253da0a688cbba336
font_01_sfnt_off0000f90a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF90A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001111c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1111C 19088 bytes
SHA-256: 8a8343043affd51950124a199d37647b0d344425485ff93e907e45d9899e8622