Malicious PDF — malware analysis report

Static analysis result for SHA-256 3e6720d146dda57d…

MALICIOUS

PDF

82.3 KB Created: 2021-09-03 01:45:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-18
MD5: 2ceb666081c19979cb3b4adf8852c2a5 SHA-1: e3fd8c855f4e94984adcb93967b7b2bd437f049a SHA-256: 3e6720d146dda57dcc570008fd4bc616e89ba9da99bd589fdf6978422cda2841
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs, many of which point to compromised websites or are part of a link farm designed to redirect users. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the URL structure suggests a phishing or content-luring attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://infrive.ru/uplcv?utm_term=star+wars+force+and+destiny+character+sheet+fillable+pdf PDF link annotation
    • https://legacydockandmarine.com/wp-content/plugins/super-forms/uploads/php/files/3a55e97fd69977d7f19f20cb80e65145/17080679503.pdfIn PDF document text
    • http://barbusci.it/maisUserFile/file/zuwotet.pdfIn PDF document text
    • http://prttour.ca/FileData/ckfinder/files/20210818_1C29543668786916.pdfIn PDF document text
    • http://saiprogetti.net/userfiles/files/risedojogewadepijivugopo.pdfIn PDF document text
    • https://bold-iot.com/uploads/files/202108312011211826.pdfIn PDF document text
    • http://a1climbing.com/userfiles/files/56200305503.pdfIn PDF document text
    • http://fazekaskozpont.hu/images/upload/file/51504682138.pdfIn PDF document text
    • http://cukiernia-waltar.pl/qcms/userfiles/file/niteremorovenur.pdfIn PDF document text
    • https://relaxbotanika.cz/ckfinder/userfiles/files/tosakuv.pdfIn PDF document text
    • https://cutletsmeat.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608414efaee2e---bekunoretusigokidev.pdfIn PDF document text
    • https://istanbulbalbir.com/upload/ckfinder/files/62490036649.pdfIn PDF document text
    • http://firmykominkowe.pl/Obrazki/edytor/file/94519877080.pdfIn PDF document text
    • https://skillmapmagazine.com/ckfinder/userfiles/files/99467148567.pdfIn PDF document text
    • https://beautifullifeuk.com/wp-content/plugins/super-forms/uploads/php/files/b8619ac1e10575ca290b629b162f78db/26495683793.pdfIn PDF document text
    • https://xn--80aaa1arbfjoe3bzh.xn--p1ai/data/files/takilalowalasib.pdfIn PDF document text
    • http://www.ashtralmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa2573b3cfd---12023940921.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/pn7ueh82cbk55hbjmjancjn9o0/57556151553.pdfIn PDF document text
    • http://juniorsmagazine.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d600345083---72606814840.pdfIn PDF document text
    • http://www.dnevi-sekretarjev.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160c95d77d1dca---wetotilapate.pdfIn PDF document text
    • http://floramarble.com/uploads/viwufasopexe.pdfIn PDF document text
    • http://www.darvidproperty.com/news/file/93196041089.pdfIn PDF document text
    • http://robbes.nl/media/files/vazuzor.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_off0000d8f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8F0 11132 bytes
SHA-256: 730c104dadc22e8d58e2044173a25fd8804170b45bd335362beebdbad45023d8
font_01_sfnt_off0000f2a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2A8 18604 bytes
SHA-256: bad902d3b09ae07ae4a53e44f024c593447c56077c644bb0f9a2d324604a4236
font_02_sfnt_off000122fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122FC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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