Malicious PDF — malware analysis report

Static analysis result for SHA-256 b5a3fa3755451a6a…

MALICIOUS

PDF

127.9 KB Created: 2021-07-26 10:00:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 4c68383e4ee4b9d5d5ec90a3a2e6d5a6 SHA-1: 1ad84e7d4aea10b9e2769fbd2843a0f7f46316ea SHA-256: b5a3fa3755451a6a7b08bc8e3a657d941dbfd1ebf2e1fb9985fee7e623c9cf81
196 Risk Score

Malware Insights

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

The file was detected as a malicious PDF by ClamAV and an ML classifier. It contains numerous links to compromised websites, indicating a link farm designed to redirect users. The presence of 'curl' in the document text suggests an attempt to download additional content, likely a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • LOLBin token sequence in document text high SE_LOLBIN_RUN_COMMAND
    Extracted document text contains a Windows script/execution tool name (PowerShell, mshta, cmd, rundll32, regsvr32, …) within 220 characters of a dangerous flag, command verb, or URL. This is a visible 'run this' instruction in HTML/PDF/RTF lure bodies, or — in macro-laden Office files — the macro's own string-pool entries appearing adjacent in extracted text.
  • 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 http://www.consorcio.edu.pe/wp-content/plugins/formcraft/file-upload/server/content/files/160a9806a615d0---befapirowefodopofi.pdf In PDF document text
    • https://haps.company/wp-content/plugins/super-forms/uploads/php/files/ue226poetejoepptdvt47rf490/58608750657.pdfIn PDF document text
    • https://gfow.om/wp-content/plugins/super-forms/uploads/php/files/1iii799f7931hee49i6ncurlku/39051192245.pdfIn PDF document text
    • https://webgirls-studio.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f2b200cc3f---20745059082.pdfIn PDF document text
    • https://westcoastmovers.ca/wp-content/plugins/super-forms/uploads/php/files/q8h42sp6j6ad3qnv3d2g5jja07/86246126325.pdfIn PDF document text
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/6ed8a4adef7a68f023c71d4b534b8671/7638358546.pdfIn PDF document text
    • http://alpha-th.com/userfiles/file/83776040266.pdfIn PDF document text
    • http://interwork.sk/userfiles/file/wuferufuvapuropebatulijap.pdfIn PDF document text
    • https://flylights.pl/wp-content/plugins/super-forms/uploads/php/files/k1l7e6fsa3v277b63legpiekno/90664062905.pdfIn PDF document text
    • http://ceroki.com/image/files/55907170656.pdfIn PDF document text
    • http://counterreaction.net/wp-content/plugins/formcraft/file-upload/server/content/files/16085e31a80be1---63538929736.pdfIn PDF document text
    • http://la-roofers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16080e1821f3da---doduxabipawipesudijop.pdfIn PDF document text
    • https://www.lavishlook.se/wp-content/plugins/super-forms/uploads/php/files/1af0aa7814cba819b44fdde8a36e747c/nozipajuli.pdfIn PDF document text
    • https://www.hungarianassociation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607036353ad07---3543518585.pdfIn PDF document text
    • http://texmet.pl/userimages/file/sodorekagifeweru.pdfIn PDF document text
    • https://amthanhanhsangchinhhang.vn/upload/files/sofisexinumotewemaguni.pdfIn PDF document text
    • https://bd-sokolovska.eu/userfiles/file/55374816546.pdfIn PDF document text
    • http://timnhanhonline.net/upload/files/54830558132.pdfIn PDF document text
    • https://uleiuri.ro/userfiles/file/xevujofo.pdfIn PDF document text
    • http://hzjksj.com/images/upload/File/kixekolupivavux.pdfIn PDF document text
    • https://webgirls-studio.com/wp-contenIn macro / runtime command snippet
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=pokemon+black+and+white+2+strategy+guidePDF 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_off00018d63.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18D63 11468 bytes
SHA-256: 0da779e61f828cac6bb7b4aa48a313410f2a34ef021d5c50b3114409ec4c04d3
font_01_sfnt_off0001a845.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A845 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001c057.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1C057 17880 bytes
SHA-256: e7c4d3bdddd347f0c801588651776bf3f82342e845853eed219f5c168a589a30

Open this report in the interactive analyzer, or submit your own file for analysis.