Malicious PDF — malware analysis report

Static analysis result for SHA-256 77ca36e2d241b51a…

MALICIOUS

PDF

85.6 KB Created: 2021-09-21 13:29:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 87091b3858897d23e64605eb74633cdb SHA-1: 122d98733701d113500c5568a47673ecde15a563 SHA-256: 77ca36e2d241b51a044df278cd02552b22884d05207bda56e4ee8af57c73b847
156 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. Heuristics identified it as a link farm, with multiple URLs pointing to potentially compromised WordPress sites and other domains. While no scripts were extracted, the structure and URL patterns suggest an intent to lure users to external malicious content, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://www.medical-psychology.gr/wp-content/plugins/formcraft/file-upload/server/content/files/161330c105b5aa---movopowewodeke.pdf In PDF document text
    • https://alcc.c-zentrix.com/ALCC/mail_attachments/multitenant-ws-01/1/1630647515.pdfIn PDF document text
    • https://www.multilandtours.com/assets/ckfinder/userfiles/files/letediv.pdfIn PDF document text
    • https://tempegaring.com/contents/files/15757899482.pdfIn PDF document text
    • http://gesht.ru/admin/ckfinder/userfiles/files/kokobavasariwavirizo.pdfIn PDF document text
    • http://altus.pl/userfiles/file/gukutosuwameguvegaw.pdfIn PDF document text
    • http://harasim.cz/uploaded/files/sisamor.pdfIn PDF document text
    • http://allineers.netlovestories.com/upload/files/venafonelaluvobirubikap.pdfIn PDF document text
    • http://geasit.it/userfiles/files/rutijumulanedojiraravi.pdfIn PDF document text
    • http://ilksolar.com/Images/Media/files/rukolurodefetikijuxer.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/161483023507ca---31551028158.pdfIn PDF document text
    • http://sro52.ru/uploads/files/bujine.pdfIn PDF document text
    • http://omgmediatank.com/userfiles/files/31750573201.pdfIn PDF document text
    • http://kietminhrivet.com/upload/files/96590800574.pdfIn PDF document text
    • https://awinresource.com/uploadfile/file/worotokexakuko.pdfIn PDF document text
    • http://stadion-zarya.ru/ckfinder/userfiles/files/ninuladizul.pdfIn PDF document text
    • https://ibrahimkoc.com/images/Media/files/guwibizazozexujunalu.pdfIn PDF document text
    • https://hv2barrier.com/application/third_party/ckfinder/userfiles/files/misexuritakalomepa.pdfIn PDF document text
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/1f219608fb84f63842a1d54ef5f02e49/gozinuxomu.pdfIn PDF document text
    • http://huseyindurmuslar.com/images_upload/files/bekositesej.pdfIn PDF document text
    • https://nacionalequipamentos.com/ckeditor/uploads/files/muzivitikafalalej.pdfIn PDF document text
    • http://almar-bus.pl/userfiles/file/57290109626.pdfIn PDF document text
    • http://birons.net/wp-content/plugins/super-forms/uploads/php/files/92bcabd34e8123f4b61464a35aa98ab9/bafokevejiwamujixobofo.pdfIn PDF document text
    • https://shriayurvednagpur.org/public/ckfinder/userfiles/files/83051156514.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=watch+child%27s+play+3+123moviesPDF 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_off0000e62d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE62D 11124 bytes
SHA-256: 45fc2823971dce01bb321d40667d9aac2b15258c47231730da96fc784e9a0db8
font_01_sfnt_off00010061.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10061 18352 bytes
SHA-256: e5edb591726b938755bb27c6be16b02ae8b5b18514b44fbb40555dd560fbff47
font_02_sfnt_off00013083.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13083 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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