Malicious PDF — malware analysis report

Static analysis result for SHA-256 2a320a656bf1fb98…

MALICIOUS

PDF

68.3 KB Created: 2021-10-02 18:57:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 722f256ccfa5488d2c70f6c8223d9de8 SHA-1: 8a107e92cddf0a7f47d68b7624f6709f564ac05e SHA-256: 2a320a656bf1fb98c5f911b12e7d7884587b80bd71eaa68eeaca3b84947f78df
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs that point to various websites, many of which appear to be compromised WordPress installations or disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a deliberate attempt to create a link farm, likely to distribute malicious content or conduct phishing. The ML classifier and ClamAV detection strongly suggest malicious intent, classifying it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://krisoc.ru/uplcv?utm_term=acl+2021+lineup PDF link annotation
    • https://propbrains.com/wp-content/plugins/super-forms/uploads/php/files/42ac303c87dbca9a9de3caf113ed9889/84214035728.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/ttehg5v460sc33jnfgi61teiq8/22886622352.pdfIn PDF document text
    • https://imaggu.com/ci/userfiles/files/fobititupaxojujuwosixix.pdfIn PDF document text
    • http://quaretti.it/userfiles/files/wepiraduxosajoros.pdfIn PDF document text
    • http://sh8ke.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139206a7798d---duzodirilodisujugunesewuw.pdfIn PDF document text
    • http://theeultimatenetworker.com/ckfinder/userfiles/files/nimebajuselofig.pdfIn PDF document text
    • https://miamiuniquelimo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614f365093b7f---gugatuvevuli.pdfIn PDF document text
    • https://www.hotel-restaurant-plainfaing.fr/ckfinder/userfiles/files/werizo.pdfIn PDF document text
    • http://www.kowel.com/ckfinder/userfiles/files/1632380774.pdfIn PDF document text
    • http://adamlegal.com/userfiles/file/liruwekekonitasefuneseb.pdfIn PDF document text
    • http://polipack.ru/content/file/63385780605.pdfIn PDF document text
    • http://secureyun.cn/uploadfile/file///2021100122531051.pdfIn PDF document text
    • http://lltsg.com/uploadfile/file///2021090510515387.pdfIn PDF document text
    • http://startmatbaa.com/userfiles/file/32156555704.pdfIn PDF document text
    • http://www.moteco.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16156fdd2937d8---89682365286.pdfIn PDF document text
    • http://www.unidacardoso.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613ae344bd702---19316231706.pdfIn PDF document text
    • http://pattarasawat.com/ckfinder/userfiles/files/talomugexuwetazudufuveg.pdfIn PDF document text
    • http://laiksmodalux.lt/app/webroot/uploads/userfiles/files/31733621291.pdfIn PDF document text
    • http://warmistore.com/userfiles/file/betavavobawusiji.pdfIn PDF document text
    • http://www.sindafaz.com.br/admin/editor/ckfinder/userfiles/files/55820800713.pdfIn PDF document text
    • http://www.driftime.ee/wp-content/plugins/formcraft/file-upload/server/content/files/161560baf36832---86336344469.pdfIn PDF document text
    • http://herningbadintra.dk/app/webroot/upload/files/14998858232.pdfIn PDF document text
    • http://111-orte.de/testarea/cwsCMSlight/media/files/69395903292.pdfIn PDF document text
    • http://ciaomamma.hu/editor_up/48131759801.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_off0000aff3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAFF3 10092 bytes
SHA-256: 520dac7add88a976bd7cf5adeb6199c63583226294c1160147c4c0cca6e19ffa
font_01_sfnt_off0000c693.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC693 15140 bytes
SHA-256: 2f3312d576213c1be4695300a5b209e2a6e5f4569b07b4632dac180a9f05b0c7
font_02_sfnt_off0000ec34.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC34 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.