Malicious PDF — malware analysis report

Static analysis result for SHA-256 83910c88c9cd3783…

MALICIOUS

PDF

86.2 KB Created: 2021-06-28 07:08:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 794ef5f0e148b924ac1a320fc5b738f0 SHA-1: a0a1636583df776dafee55fe85b801d4070042fb SHA-256: 83910c88c9cd37837d06b1b8ed298ae3b03cad4eedcb3f67164805f37b66103f
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress sites, suggesting a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded links are the primary indicators of compromise, likely leading to further stages of an attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://gamedunyasi.com/calisma2/files/uploads/74510245573.pdf
    • https://livingcircles.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1608d7e23c2a97---45533679382.pdf
    • http://anaminfo.com/attachfile/file/93408845955.pdf
    • http://visualpaint.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f577d2a757---jevenezugizo.pdf
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/p7jqdou266e6obeoh8ki2909s2/88994600080.pdf
    • http://boulderdivorcelaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160867b61a888f---26014499730.pdf
    • https://vallejardin.com/wp-content/plugins/super-forms/uploads/php/files/fa1b0100030e1d4ae3d012463436d326/4463481305.pdf
    • http://www.majoriscambio.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607ca4e812132---darezanevij.pdf
    • http://www.cheapmotorcycleinsurancepa.com/wp-content/plugins/super-forms/uploads/php/files/fp6558ii86k7141f5efoh4vj11/reruka.pdf
    • https://travelselection.us/wp-content/plugins/formcraft/file-upload/server/content/files/160c15b892575d---45737694639.pdf
    • http://cedresarquitectura.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c74f8173476---sinefawopevum.pdf
    • https://www.cr-sdc.org/wp-content/plugins/super-forms/uploads/php/files/5ffb34d19bebb2261e7eb2c56a2c9707/53882212832.pdf
    • http://deurwater.com/wp-content/plugins/formcraft/file-upload/server/content/files/160acab2f7bede---rojodibudukokukino.pdf
    • http://mountmedpharmacy.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160bdffe7bed91---mubudodijitukiwuwupakume.pdf
    • https://orkhaconstruction.com/wp-content/plugins/super-forms/uploads/php/files/31th8j1lkregqka5hdp69k4aru/regatejelifaduvu.pdf
    • https://www.apartamentselsllacs.com/wp-content/plugins/super-forms/uploads/php/files/1n6evecivo6plkac7mikdeap38/muzuniriwavanavolapunub.pdf
    • https://profbuhotchet.ru/wp-content/plugins/super-forms/uploads/php/files/2ee326993a1230f4d64e7e4acec5667e/36510290819.pdf
    • http://projectbudapest.hu/wp-content/plugins/formcraft/file-upload/server/content/files/160a7cbfc1bd19---46728903981.pdf
    • https://www.ezhealthcheck.com/wp-content/plugins/super-forms/uploads/php/files/hd8gt41vssahdepotj4gicil5a/rovogox.pdf
    • http://ohmytour.kr/FileData/ckfinder/files/20210627_ED029547DB32AB7E.pdf
    • https://stakeoutllc.com/wp-content/plugins/super-forms/uploads/php/files/f4ea7dfa3bcd289252d81b48dca430fa/76816617130.pdf
    • http://www.jcca.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/1609a7fb5112af---xegixo.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=clash+of+clans+th7+defense+base
    • http://lovewhereyoulv.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/48efc9f98d5f5a7d44edd3aa2eae2865/xulebufotirepe.pdf
    • 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_off0000ed8d.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xED8D 16792 bytes
font_01_sfnt_off000105a4.bin
1f300ff0cdcdd670b1d83dd6f3f2873c6da34c4db6412f6a0d4a1d951ccbb8e5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x105A4 10604 bytes
font_02_sfnt_off00011dea.bin
44adbe3ba7a363413ba7c6f01010acff26da9044e74ea7380be1d3d93f4d005a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11DEA 17876 bytes

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