Malicious PDF — malware analysis report

Static analysis result for SHA-256 d019b1e18c0ee048…

MALICIOUS

PDF

89.5 KB Created: 2021-09-03 15:51:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: f20bfbbf5c3803ed1bdcd66f554f4be4 SHA-1: c36cc7fd403669bf47084cd50f67701fb2ef3051 SHA-256: d019b1e18c0ee048c5fd3de0446e969f1d572fb3d0cdcb83792b96dc2af6af38
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs that form a link farm, directing users to various domains, some of which are hosted on compromised CMS platforms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware delivery. No scripts were extracted, but the structure suggests a lure to external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://allytemp.ru/uplcv?utm_term=duracoat+colour+chart+pdf PDF link annotation
    • http://akcjonariusz.com/UserFiles/file/18450866834.pdfIn PDF document text
    • http://sghr.ca/upload/ckfinder/files/18694538761.pdfIn PDF document text
    • https://www.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1606f12ce4d261---25194767312.pdfIn PDF document text
    • https://alperbehang.nl/userfiles/file/11191749804.pdfIn PDF document text
    • http://thankschicken.com/uploads/files/57994225661.pdfIn PDF document text
    • http://lhsclassof1971.com/clients/74120/File/sobegepuvorovugajeze.pdfIn PDF document text
    • https://menlopark.com/wysiwygfiles/file/jelozakeketig.pdfIn PDF document text
    • https://radekslodkiewicz.pl/files/file/pufafer.pdfIn PDF document text
    • https://marljivo.hr/userfiles/file/nusofulerijekug.pdfIn PDF document text
    • https://serwisnawigacji.pl/userfiles/file/kigamirutujebufanu.pdfIn PDF document text
    • http://bagandpack.ru/wp-content/plugins/super-forms/uploads/php/files/8195aaa098995158f6798a4e812c71d3/magatevoxi.pdfIn PDF document text
    • https://landbondcorten.com/attachment/file/38e23472d943ce5e5fc5eeac6ac5a95a.pdfIn PDF document text
    • http://www.impactit.in/ckfinder/userfiles/files/3559274247.pdfIn PDF document text
    • http://happyhanool.com/ckupload/files/25788412870.pdfIn PDF document text
    • http://color-gateway.com/userfiles/file/72690597630.pdfIn PDF document text
    • http://naosgym.com/userfiles/files/kixezokoxasomilofum.pdfIn PDF document text
    • http://albertopizzetti.it/userfiles/files/garekodabodokufabutagimir.pdfIn PDF document text
    • http://bascobrunswick.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a481f80a094---ludijilafazovunolot.pdfIn PDF document text
    • http://www.marcado.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16079b4b99090a---29019230371.pdfIn PDF document text
    • https://habibitours.net/ckfinder/userfiles/files/wewalivibujemawapeki.pdfIn PDF document text
    • https://instalacje-elektryczne.net/ckfinder/userfiles/files/67150410637.pdfIn PDF document text
    • http://muzeumostrowiec.pl/obrazy/file/37296521977.pdfIn PDF document text
    • http://kulturazebrak.cz/userfiles/demajuxakepadiraji.pdfIn PDF document text
    • https://aordonez.com/images/contenidos/files/fozavanuwosadabutu.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_off0000eff2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFF2 10324 bytes
SHA-256: ad517531fe7bfeaeed61675a717ef7e1648798dd5fd2f96b76d9657a6f90b0f4
font_01_sfnt_off0001075e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1075E 21808 bytes
SHA-256: e01f345a5a3edb91d6553e53f4e0211f7dce741df2d4196351bd3ee3fb506d81
font_02_sfnt_off000140df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x140DF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1