Malicious PDF — malware analysis report

Static analysis result for SHA-256 3b239c67f2cfbb81…

MALICIOUS

PDF

83.7 KB Created: 2021-06-25 15:20:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 3abe043a907723b7a98687ad4a728db8 SHA-1: eb5b41d3610c8737b2dd5e5ac5d1259789c4ecfb SHA-256: 3b239c67f2cfbb817f4c25d289865b63856b7727538e0f9e7063564078487a3f
156 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to multiple compromised WordPress sites and other potentially malicious domains. The presence of numerous links on disposable hosting and the use of UTM parameters suggest an attempt to obscure the true destination and potentially engage in SEO poisoning for malicious purposes.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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 http://nek.ua/wp-content/plugins/formcraft/file-upload/server/content/files/1609ce891293bf---gexerepo.pdf
    • http://www.startservis.sk/novy/ckfinder/userfiles/files/vabonuzaxetuligiwetuzil.pdf
    • http://bienbao.org/uploads/files/badafoberopoka.pdf
    • http://discarga.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606caf97d6ca8---jitulawojaxaxowamo.pdf
    • http://roxburyhs1987.com/clients/63080/File/61964004434.pdf
    • https://rhythmcprandfirstaid.com/wp-content/plugins/super-forms/uploads/php/files/9d3633dd11db33caed92da07348c4346/bopuregugakemenewebenum.pdf
    • https://balaji-technology.com/userfiles/file/gumimu.pdf
    • http://championshipsportsrings.com/clients/23492/File/31432423076.pdf
    • https://best-turbos.com/wp-content/plugins/super-forms/uploads/php/files/a1007f45a52a693d4d433f8ae0f6803a/mejejobavagu.pdf
    • http://www.deadclan.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160985c7d48457---dejurojutafitopuzis.pdf
    • http://emirates-offshore.com/uploads/image/file/fivajuximitevekonezurigi.pdf
    • https://lostsoulsmemorialnj.org/wp-content/plugins/super-forms/uploads/php/files/2cf59bee67fd7fc506cdfeb724ceba6c/25672003012.pdf
    • http://bellezaeimagen.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/16081e1a3ae953---45014316171.pdf
    • https://torrentclub.vip/wp-content/plugins/super-forms/uploads/php/files/km751c61a6seef1gjks1he71mh/9347681885.pdf
    • https://jollytime.ru/wp-content/plugins/super-forms/uploads/php/files/a0b6db5ba979c45b7d2d986afffcd5d8/vomoda.pdf
    • https://www.webplease.it/wp-content/plugins/super-forms/uploads/php/files/q88ii943d8lijj3dtfmika0lh3/doximoguzorotep.pdf
    • http://profil-metall.de/content/uploads/file/67159522625.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=d+contracture+hand
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e52c.bin
479948a543af3982eb33eae9fe79e0af6866cc66fa0f6b9bed5f1910d003b253		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE52C 10260 bytes
font_01_sfnt_off0000fc2a.bin
795f6456ef05a4826d79b96ed43ee7f9494315b4855235c0f87aefa2263e5031		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFC2A 17048 bytes
font_02_sfnt_off0001289f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1289F 16792 bytes

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