Malicious PDF — malware analysis report

Static analysis result for SHA-256 72b20a9efefed27b…

MALICIOUS

PDF

72.4 KB Created: 2021-09-29 01:55:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 952e5eef862055a8bcc717808bf406da SHA-1: 74d230fdfd63eda9149aa0e8604b9a1211988204 SHA-256: 72b20a9efefed27b63bc200f88c3ec8fcf075581dd6040fcf11b701fa1ec3536
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded links are indicative of techniques used to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://huntic.ru/uplcv?utm_term=game+of+thrones+graphic+novel+online PDF link annotation
    • http://gleb777.com/fck_upload/file/zulekogijijajifibizezuko.pdfIn PDF document text
    • http://avandcie-energy.com/ckfinder/userfiles/files/11219293711.pdfIn PDF document text
    • http://vegasoft.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1614253ac1b404---raragasonexofopisadixaj.pdfIn PDF document text
    • https://mar3ol.com/Files/files/gunezerupesiputavusejis.pdfIn PDF document text
    • http://brucemayrockinstitute.com/assets/ckfinder/core/connector/php/uploads/files/sinixupubenetator.pdfIn PDF document text
    • http://miamiwars.pl/wp-content/plugins/super-forms/uploads/php/files/3f390b74c79a6aa4661aa62f6c081cc6/zakezidilesesedexo.pdfIn PDF document text
    • https://epgeptech.hu/ckfinder/userfiles/files/dizota.pdfIn PDF document text
    • https://forssah.co/userfiles/file/muturefelima.pdfIn PDF document text
    • http://innersolutions-uk.com/file/46015341226.pdfIn PDF document text
    • http://skkl.cn/filespath/files/20210903150248.pdfIn PDF document text
    • http://www.recetasyconsejos.com/wp-content/plugins/formcraft/file-upload/server/content/files/16149cca902a58---93525885220.pdfIn PDF document text
    • http://omnoiptv.com/outscapes/admin/ckeditor/uploads/ck/files/zejizoruporofiruvadavosa.pdfIn PDF document text
    • http://brezov-gaj.si/uporabnik/file/83793187327.pdfIn PDF document text
    • http://fruhmann-elektrotechnik.at/91181325113.pdfIn PDF document text
    • http://bertrandetgastineaudesigners.fr/userfiles/file/bozivapapit.pdfIn PDF document text
    • http://zdrowejaja.com/Upload/file/xodezokow.pdfIn PDF document text
    • http://www.sana-anong.com/ckeditor/ckfinder/userfiles2/files/veburoxefiboki.pdfIn PDF document text
    • https://peltonfell.org.uk/ckfinder/userfiles/files/ganodiridoxodapibaxaxo.pdfIn PDF document text
    • http://istanbulballoons.com/ckfinder/userfiles/files/59346695461.pdfIn PDF document text
    • http://demo-jesma.shopcloud.es/ckfinder/userfiles/files/40869614996.pdfIn PDF document text
    • http://teplospectr.ru/images/files/zilejivomewaxif.pdfIn PDF document text
    • http://udokutscher.de/gfx/userfiles/files/98421991831.pdfIn PDF document text
    • https://pchome.uzai.ca/upload/files/wejefiposukigabave.pdfIn PDF document text
    • http://moskvaznaet.ru/upload/files/wulimetopakolapurugubef.pdfIn PDF document text
    • 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_off0000b293.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB293 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000caa5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCAA5 18528 bytes
SHA-256: a94c7dcba6435f1d98e69dc3bf2848bb646104e39286f3e731e063a26581dbbb
font_02_sfnt_off0000fa68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA68 11032 bytes
SHA-256: 6d159077c5086a9155ebdbbc9712e0c98c988beeebbf87cd7bedd5ab65fb5390

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