Malicious PDF — malware analysis report

Static analysis result for SHA-256 4a8d5d920c745471…

MALICIOUS

PDF

84.5 KB Created: 2021-09-06 14:05:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: ee4042ff208ce159eafde4d0d3c9d097 SHA-1: 72c2250db1e4040bd43d33a23b2c857bb7ead41f SHA-256: 4a8d5d920c7454710b5a7f53db281a22e4ee58a9fc744ec371435ab3f1749d50
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many of which point to compromised WordPress sites and are structured as a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution through these links. No scripts were extracted, and the document body was unreadable, limiting the analysis of the specific lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://lisacutler.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613040a21ee78---kovowidob.pdf In PDF document text
    • http://www.anclupnapoli.it/userfiles/file/92212242539.pdfIn PDF document text
    • http://newcityhk.com/userfiles/24541955663.pdfIn PDF document text
    • https://www.auto-ecole-rive-droite.fr/ckfinder/userfiles/files/92681551513.pdfIn PDF document text
    • http://voszveszprem.hu/_user/file/ximaxo.pdfIn PDF document text
    • http://childconnect.com/swi/fckfiles//file/xisokufunofupowazug.pdfIn PDF document text
    • http://fitviewer.de/files/file/zazogewepifegivo.pdfIn PDF document text
    • http://appartenvue.net/appart/upload/images/zivitekamidujedolilorole.pdfIn PDF document text
    • https://mszukam.pl/dat//file/44004468780.pdfIn PDF document text
    • https://anukulagrotech.com/userfiles/file/70353434277.pdfIn PDF document text
    • http://energosol.pl/images_cms/file/xupasodakesubazepagopi.pdfIn PDF document text
    • http://milcontabil.com.br/wp-content/plugins/super-forms/uploads/php/files/nimi36t6af8o4g59j44vp4abk2/6904321079.pdfIn PDF document text
    • http://bubblesoflove.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a5ec2c8b75f---73412622878.pdfIn PDF document text
    • http://english-island.pl/wp-content/plugins/super-forms/uploads/php/files/8vohdibptdip6082uios76tp73/nuwodajagafusagitikite.pdfIn PDF document text
    • http://nepodoshlo.kz/ckfinder/userfiles/files/faxaziwesezakas.pdfIn PDF document text
    • http://sts-logistika.ru/wp-content/plugins/super-forms/uploads/php/files/dbef6f355de36fac3de146e69a48d827/gijorinujitezuwibefa.pdfIn PDF document text
    • https://loskutova.site/wp-content/plugins/super-forms/uploads/php/files/73cdc1ab391f82516cd4697e8b058d48/bejiketosufewolawutoze.pdfIn PDF document text
    • https://www.hospedeagora.com.br/wp-content/plugins/super-forms/uploads/php/files/s98isfe6fe27j81c48gt801v3u/mabinafazakodik.pdfIn PDF document text
    • https://sunridgecorp.com/uploads/files/202109051037054113.pdfIn PDF document text
    • https://alignerco.com/wp-content/plugins/super-forms/uploads/php/files/e37f4eed28f6815295bac9fb5a050461/48540221655.pdfIn PDF document text
    • http://www.reroofingbrisbaneqld.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608e16e541963---wadulosixamuwozunumibebi.pdfIn PDF document text
    • https://fallsplat.se/bildbank/file/wonakenubegofez.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=adestrar+caes+pdfPDF 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_off0000e1ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1BA 20140 bytes
SHA-256: 0e3b98a8860622d9496b241d775e93fd8f2111984c28dabe6afd294ff566ca20
font_01_sfnt_off0001157c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1157C 10232 bytes
SHA-256: 05ee883180bbe793c1a543163ebd4d3f8fc60fa482300d256e6fe37c47a5c95f
font_02_sfnt_off00012c9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C9B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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