Malicious PDF — malware analysis report

Static analysis result for SHA-256 62518eed99ed3712…

MALICIOUS

PDF

87.4 KB Created: 2021-07-09 13:50:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 9acc201d43c7257699bf821f09cffdf1 SHA-1: 38cb97c3450864ef4327c2436b310370890eba0f SHA-256: 62518eed99ed37129a03f3a42df785cec27d4112b6520c838347d815a3e88c5f
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. The document contains numerous links to disposable hosting and compromised CMS upload directories, suggesting a phishing or malware distribution scheme. While no scripts were explicitly extracted, the presence of embedded URLs and the nature of the heuristics point towards an attempt to trick users into downloading further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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 https://thai-airpark.com/ckfinder/userfiles/files/29417527825.pdf In PDF document text
    • http://55pluscommunityspecialist.com/userfiles/files/benojinalitatoxopov.pdfIn PDF document text
    • http://antwerp-rentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072f63857b5e---nigamijajowumitojutugid.pdfIn PDF document text
    • http://geyikkimya.com/userfiles/upload/file/13936829934.pdfIn PDF document text
    • https://www.kngroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c707174f0a6---3068989250.pdfIn PDF document text
    • https://nestaerospace.com/uploads/file/20973660322.pdfIn PDF document text
    • https://amagi.la/wp-content/plugins/formcraft/file-upload/server/content/files/160a31985ad70d---menodixiditezapilanum.pdfIn PDF document text
    • https://www.alongsideasia.com/wp-content/plugins/super-forms/uploads/php/files/2168ad4049c198940034f1f61ee9e2c1/58520279506.pdfIn PDF document text
    • https://lakecountyoralsurgery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd63378566c---raxemo.pdfIn PDF document text
    • http://riversreunion.org/clients/8699/File/domitaral.pdfIn PDF document text
    • http://cipetbhopal.com/webimg/files/19596399636.pdfIn PDF document text
    • https://www.alphaveneers.com/wp-content/plugins/super-forms/uploads/php/files/51ecebb2e4b12e22729fb9c64b9eab7d/906717164.pdfIn PDF document text
    • https://youstore21.com/wp-content/plugins/super-forms/uploads/php/files/c1d30ca7764b8874d6273952981f4c1b/megivitawowiletesidunega.pdfIn PDF document text
    • http://www.ambredore.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a262eccb31d---35760870479.pdfIn PDF document text
    • http://akcjonariusz.com/UserFiles/file/pibumebanibom.pdfIn PDF document text
    • http://scissortailfarms.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607dfeeb4ee0e---26154007989.pdfIn PDF document text
    • https://certifiedmoversinc.com/wp-content/plugins/super-forms/uploads/php/files/73dd545de31eb103ae24fb3df730d427/25225302320.pdfIn PDF document text
    • http://birkhoffhi.com/userfiles/files/50538273347.pdfIn PDF document text
    • https://www.swx.global/wp-content/plugins/super-forms/uploads/php/files/e9e315406392f4e8045abbe39461cb3e/kagagovuluwamowoxemaxefiz.pdfIn PDF document text
    • http://duszek-lasu.pl/userfiles/file/92738718043.pdfIn PDF document text
    • https://alshaabcoop.com/userfiles/file/63686220039.pdfIn PDF document text
    • https://seerupit.dk/assens/file/kipugeturivalux.pdfIn PDF document text
    • http://allaboutdowney.com/userimages/garibazemumonafofotim.pdfIn PDF document text
    • https://www.mii.net/wp-content/plugins/super-forms/uploads/php/files/59339ad3a57bca1fed7df365535ffc45/89999690878.pdfIn PDF document text
    • https://yziact.fr/wp-content/plugins/super-forms/uploads/php/files/2rl5tln8m4ljeiaib4eberqvo6/gevodarowepubofadijezeda.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=phased+development+process+in+software+engineeringPDF 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_off0000f2f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2F2 16576 bytes
SHA-256: b53ae710df5d9c392be01ad17fabee5fc62b2c6166f6636b45b80ba90467dd09
font_01_sfnt_off00011ddf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DDF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000135f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x135F6 11220 bytes
SHA-256: 4834d210f0b84abe9414273294f2029b53e2593203019ce819c634c2cb909df2

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