Malicious PDF — malware analysis report

Static analysis result for SHA-256 3a16fa6ecce6021d…

MALICIOUS

PDF

99.5 KB Created: 2021-06-28 08:11:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 2b28fd7ee00f52c2fd995fd56bc63b77 SHA-1: 31a51c28bde580b257918f37b885922b24e8a039 SHA-256: 3a16fa6ecce6021d462fd69d0be10eb304547146bcb98b3142295315df74e47b
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document is identified as malicious by multiple heuristics and a machine learning classifier, including ClamAV's 'Pdf.Phishing.Trojan' detection. It functions as a link farm, directing users to various compromised websites and disposable hosting, likely to facilitate the download of further malicious content. The presence of a 'download button' lure and the use of UTM parameters in URLs suggest a phishing or social engineering attempt to trick users into downloading malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9936

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://geostudio.eu/userfiles/files/93788603274.pdf In PDF document text
    • http://aberdeeneyes.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16074a9f82598e---5195861935.pdfIn PDF document text
    • http://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/77tr7jh27t7u01vpla4io2uraj/kiledakonujevonakako.pdfIn PDF document text
    • http://www.radioemka.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3433a435d3---tofozufexisiviti.pdfIn PDF document text
    • https://waroproject.com/file/24142572398.pdfIn PDF document text
    • https://tempegaring.com/contents//files/jazileb.pdfIn PDF document text
    • https://acronimocostanzo.com/userfiles/file/puladojosuzuwizodexani.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/hl8ggnuenepc4tgl052tejooq0/vilewilevagoxaxop.pdfIn PDF document text
    • http://opuspoint.com/ckfinder/userfiles/files/70243052864.pdfIn PDF document text
    • http://svenstavik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160985dc6a79ca---21793864854.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/bgmlgm80hlbcpv6kdkc63ar395/zafirume.pdfIn PDF document text
    • https://discoverapartmentsforrent.com/wp-content/plugins/super-forms/uploads/php/files/2527f5eeb63f84e4bac75e752934881a/fototesugasukopugonuram.pdfIn PDF document text
    • https://cjsc.se/ckfinder/userfiles/files/xubilukokodowuluxar.pdfIn PDF document text
    • http://ferramentabelleggia.it/public/file/37346936655.pdfIn PDF document text
    • https://jdbailbonds.com/wp-content/plugins/super-forms/uploads/php/files/839c3efe3a791e7729bf487ceebba541/50590121740.pdfIn PDF document text
    • http://dmn.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160d8fc77c60cf---semopolaselixubutefamim.pdfIn PDF document text
    • http://aldo-ins.com/userfiles/file/gavasotulubuzebodilojulaw.pdfIn PDF document text
    • https://rmp-traueranzeigen.de/cms/files/65843005889.pdfIn PDF document text
    • http://llux.vn/uploads/files/kuleworojunexovopozo.pdfIn PDF document text
    • http://jfkanacon.org/data/userfiles/files/detaxazuwabixevorofojifu.pdfIn PDF document text
    • http://www.insurancedirectcanada.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160706f933df70---zeradisuviretibu.pdfIn PDF document text
    • http://tamilannuaire.com/var/www/vhosts/vps296430.ovh.net/tamilannuaire.com/images/file/pufoxoxiwopojusamezip.pdfIn PDF document text
    • http://losmarinoslanzarote.com/marinarubicon/admin/file/jobifinipafanawamo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=pokemon+x+game+download+for+androidPDF 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_off0001109e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1109E 10712 bytes
SHA-256: 96fdcbfef925e9cb7c7108d02738cb7f59fe51b89bcbc29b3a86892a16980906
font_01_sfnt_off00012906.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12906 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014118.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14118 29776 bytes
SHA-256: 5ac66b7eed90a7e65fa87b3187e0e0f914f3515d2041c3b5b8752a24c292c05c

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