Malicious PDF — malware analysis report

Static analysis result for SHA-256 3ef4a6be0a47ec40…

MALICIOUS

PDF

85.5 KB Created: 2021-09-09 13:31:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 1bc7fc64aa49303f5ea48d07fe39c741 SHA-1: bfbe832bb0a6244f708a4e7a6993335a2fdd0f6f SHA-256: 3ef4a6be0a47ec405415ecc599f50426ed6ebaefb548848aae694cf46775ad90
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as a malicious PDF by ClamAV and an ML classifier. It contains numerous external URIs and link farm patterns, indicating a likely phishing or malware distribution attempt. The presence of embedded URLs and the nature of the heuristics suggest the PDF is intended to redirect users to malicious sites, potentially for further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://drafthe.ru/uplcv?utm_term=app+shortcut+not+showing+on+android PDF link annotation
    • https://safetypadlocks.eu/eurostyl/photos/file/juzalemisexale.pdfIn PDF document text
    • http://aallergy.netlovestories.com/upload/files/vusegarepejomovuvu.pdfIn PDF document text
    • https://www.conkite.com/wp-content/plugins/super-forms/uploads/php/files/aa0587a80952d474e51d5fb46853791e/74258263826.pdfIn PDF document text
    • http://tingchucontrol.com/Uploadfiles/files/bakofukosisuwafevugala.pdfIn PDF document text
    • http://bienbao.net/uploads/files/pawedinibawukigovatuk.pdfIn PDF document text
    • https://aadharshilaschool.org/userfiles/file/35631103317.pdfIn PDF document text
    • http://parzenica-bialka.pl/userfiles/files/dubapojozoxulerusisegeko.pdfIn PDF document text
    • http://hytechcommunications.com/userfiles/file/fovubedabuwipepaje.pdfIn PDF document text
    • http://sm.ac.th/ckfinder/userfiles/files/mobabi.pdfIn PDF document text
    • https://lingchuanfloor.com/app/webroot/userfiles/files/nejelejabomo.pdfIn PDF document text
    • https://faktxeber.com/resimler/files/lujijexusugiraledosebo.pdfIn PDF document text
    • https://lakecountyoralsurgery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613123dd91a8c---69454572674.pdfIn PDF document text
    • https://designclarf.it/file/7480825996.pdfIn PDF document text
    • http://inistor.com/ufiles/files/mumewaxodexutob.pdfIn PDF document text
    • http://dolekkoyum.com/admin/UserFiles/file/gomobawidisumazepib.pdfIn PDF document text
    • https://capitalsyndic.com/userfiles/file/bolozulutuferipilagomox.pdfIn PDF document text
    • http://arabic.cz/ckfinder/userfiles/files/bajazola.pdfIn PDF document text
    • http://argra.rs/wp-content/plugins/formcraft/file-upload/server/content/files/16139be04c73a9---72819286091.pdfIn PDF document text
    • http://daiichihr.com/uploads/news_file/gopizirurajitebaz.pdfIn PDF document text
    • http://abovomedia.hu/_user/file/ledunekekawiwegopipad.pdfIn PDF document text
    • http://www.scsk12.org/policy/files/files/31577008027.pdfIn PDF document text
    • http://www.hotel-margherita.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ff62ce910b---fovokebetag.pdfIn PDF document text
    • https://soosekszer.hu/upload/files/tegesudizifaloj.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_off0000eab0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAB0 17288 bytes
SHA-256: 6e403c248c51a529c4d9afcf1d13546da62118a5baa076dc9092287092dbecc2
font_01_sfnt_off0001177c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1177C 10780 bytes
SHA-256: cb5ce9a6df0eea76d48477d2fccc70cb5483902b8c8dd86d416f1068bc13e029
font_02_sfnt_off00013030.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13030 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1