Malicious PDF — malware analysis report

Static analysis result for SHA-256 66ba95ae0f1744d3…

MALICIOUS

PDF

84.1 KB Created: 2021-07-30 20:52:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: a30d6c2f7860a53429c008beb97def61 SHA-1: e5b443d5e9b478f383380aa5bf30c1631c1ccf4e SHA-256: 66ba95ae0f1744d3f21b53ad76d573d240d7906d095f448d48b147c41415f9cb
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised WordPress upload directories or are part of link farms on disposable hosting. The ML classifier and ClamAV heuristic strongly indicate malicious intent, likely for phishing or distributing further payloads. While no scripts were explicitly extracted, the nature of the embedded links suggests an attempt to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9983

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://ehbo-oostkapelle.nl/userfiles/file/72697982865.pdf In PDF document text
    • http://allegroescrow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7237f99157---rulefafuvagepujedisam.pdfIn PDF document text
    • http://www.medicalalliedtraining.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e98b0ecb0a---32746266533.pdfIn PDF document text
    • http://kino-profi.com/wp-content/plugins/super-forms/uploads/php/files/c94c26b7cc73a7212eac4b3cde6ae478/22510302155.pdfIn PDF document text
    • https://sca-kc.net/scauserfiles/files/pobuzadijulunajilaxosadag.pdfIn PDF document text
    • https://bevelec.com/bevelec/dossierMois/file/wixafuvanevopagi.pdfIn PDF document text
    • https://rh-h1tapi-turbo.com/contents//files/bawinigidi.pdfIn PDF document text
    • http://grubstreet.ca/ckfinder/userfiles/files/27296347288.pdfIn PDF document text
    • http://amtusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075205f33fba---15445532954.pdfIn PDF document text
    • https://www.generalutilities.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608aacb108d47---6382462174.pdfIn PDF document text
    • https://101doctor.com/uploads/ckfiles/files/60ce2cb743b9a.pdfIn PDF document text
    • http://caribsplash.org/wp-content/plugins/formcraft/file-upload/server/content/files/160d905ae56c6c---49704575847.pdfIn PDF document text
    • http://penzionnakrizankach.cz/ckfinder/userfiles/files/43049345256.pdfIn PDF document text
    • http://gleneaglehoa.org/images/file/zebefenesedag.pdfIn PDF document text
    • http://quickfix-poland.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc3a2858444---donowefogelawar.pdfIn PDF document text
    • http://luckyassessoria.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16092b9293a85a---50448205275.pdfIn PDF document text
    • https://www.darrellstuckey.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bdf687e60c7---46705010450.pdfIn PDF document text
    • http://rlponder.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/pazewureseloketadunor.pdfIn PDF document text
    • http://omak1968.com/clients/71178/File/vipivezatoworilomuroxuj.pdfIn PDF document text
    • https://www.cr-sdc.org/wp-content/plugins/super-forms/uploads/php/files/110d46564b3d948eed1f0569db0f9dde/zumoselukow.pdfIn PDF document text
    • http://megalaserasia.com/upload///26709956563.pdfIn PDF document text
    • http://madveras.com/ckfinder/userfiles/files/481707113.pdfIn PDF document text
    • http://www.danvillern.com/wp-content/plugins/super-forms/uploads/php/files/dqv0cq2ec5hntcigjh31o7avg6/vawotamemufoburevitatawi.pdfIn PDF document text
    • http://mirai-kankyo.com/userfiles/files/rozudilepa.pdfIn PDF document text
    • http://bscartridge.com/pic/jowojuraguvekemevawatokix.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=qayamat+se+pehle+qayamat+hai+yaaro+mp3+song+downloadmingPDF 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_off0000e238.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE238 11416 bytes
SHA-256: d5af75f878f381090b809d9e4d89701d369bd25d6b28297e0f4777928b3587cb
font_01_sfnt_off0000fc9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC9C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000114ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114AE 17044 bytes
SHA-256: 0f51d5c5b4a441b86b369376c7b26d72f911e3424e3bfa853490867975c3c37c