Malicious PDF — malware analysis report

Static analysis result for SHA-256 e6c0c45afd19989d…

MALICIOUS

PDF

93.8 KB Created: 2021-07-02 05:32:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: b010c008c6ff277a58c5269a55f36ce6 SHA-1: b187f73fcd5e5dd53294bcf70008f74f7c5156c1 SHA-256: e6c0c45afd19989ddd6344820ab6cf0d68ebc36b4d1837c3f4a0078425fe87ef
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains numerous links to external resources, many of which are hosted on compromised CMS upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lure users to download further malware or engage in phishing activities. The structure suggests a link farm designed to distribute malicious payloads or redirect to phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9935

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://loskutova.site/wp-content/plugins/super-forms/uploads/php/files/c6a3b2a206ae8268f01e06968af5bdd9/76049361641.pdf In PDF document text
    • http://tourister.kr/userfiles/file/pedosit.pdfIn PDF document text
    • https://markeishahall.com/wp-content/plugins/super-forms/uploads/php/files/d5136053fa28711e497e5e367a6d84f8/padewuzawoduzizoxokibola.pdfIn PDF document text
    • http://rufullthrottle.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a5de06b48a---wulexamidemeluv.pdfIn PDF document text
    • http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/rs4arbdgoorfdk83ol5n3hshf2/vemuzedonitefikuwuva.pdfIn PDF document text
    • https://centar-znr-zop.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1607d3321042ea---naxibomukudolinopaxuju.pdfIn PDF document text
    • https://evocative.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160be007271379---junofaxudumodoxenozedefa.pdfIn PDF document text
    • https://shidoremicrosys.com/media/8900453891.pdfIn PDF document text
    • http://www.tobywells.org/media/fckdir/file/vadevotilujugase.pdfIn PDF document text
    • http://pulsrmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608668e154390---20588888597.pdfIn PDF document text
    • http://evabody.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160d9c25d3c6c9---88734029151.pdfIn PDF document text
    • http://www.yoko-ono.be/images/userfiles/file/63023435075.pdfIn PDF document text
    • http://euro520.net/userfiles/file/1624215898594219964.pdfIn PDF document text
    • https://chamsocmuihong.com/wp-content/plugins/super-forms/uploads/php/files/jbrtapujg4gqpo332c8qs96vft/49256310001.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/71611005461.pdfIn PDF document text
    • http://counterreaction.net/wp-content/plugins/formcraft/file-upload/server/content/files/160c8b475ace4e---9736513529.pdfIn PDF document text
    • http://hugslock.com/app/webroot/img/files/gamunokixobutukavi.pdfIn PDF document text
    • http://progfin.pl/userfiles/file/36441143855.pdfIn PDF document text
    • http://thietkewebbacninh.com/webroot/img/files/xovimevajikebowopa.pdfIn PDF document text
    • http://pck.malopolska.pl/wp-content/plugins/super-forms/uploads/php/files/dad9876fe8085e0bcc4391f96be41a58/61493078193.pdfIn PDF document text
    • http://nnk.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160dbbb967d822---ganukapabifodakawuwemi.pdfIn PDF document text
    • https://www.tai.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16072c73e95a97---bifijafetutexinafobar.pdfIn PDF document text
    • http://maciejabramowicz.pl/upload/files/file/digefekipunedevivudita.pdfIn PDF document text
    • https://guapa2.com/admin/fck/file/dasinuwufisobadasajalaga.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=be+honest+with+yourselfPDF 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_off00010d8e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D8E 10504 bytes
SHA-256: 93d0cf64eef79aefa6ff6d2182df8e2adf60eea02a97574b2b9b0b5e4df56931
font_01_sfnt_off00012579.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12579 17116 bytes
SHA-256: 9d9bd31399b6ba844051d0200cda895534719c2d29137fc581f8757c0699f315
font_02_sfnt_off00015219.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15219 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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