Malicious PDF — malware analysis report

Static analysis result for SHA-256 517974a496cfccdf…

MALICIOUS

PDF

88.0 KB Created: 2021-09-05 16:04:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: d77acd6734402b848e96444301087bcd SHA-1: ecb6263efceeccff223a810b3aa64a8b7a0e1e76 SHA-256: 517974a496cfccdfeb8c533b93ce8a3872a6b280eddd5d2cb93277656b3bbe69
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a significant number of external URIs, many of which point to PDF files hosted on compromised WordPress sites and disposable domains. This suggests the document is part of a link farm, likely intended for SEO manipulation or to lure users into downloading further malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9764

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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 http://lukasikgroup.pl/Image/files/83159124222.pdf In PDF document text
    • https://tagoproperties.com/ckfinder/userfiles/files/5828374264.pdfIn PDF document text
    • http://sz-nuoyi.com/Upload/file/2021080501282089860.pdfIn PDF document text
    • http://powerfalcon.net/uppic/files/zakebujurap.pdfIn PDF document text
    • http://geo-equipe.it/userfiles/files/sinaxosokotiwepolapure.pdfIn PDF document text
    • http://delve-cr.com/uploads/biselijaganutitaruzunudov.pdfIn PDF document text
    • http://skuplaptop.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160c0987749559---lexasalenoguka.pdfIn PDF document text
    • https://afriqueitnews.com/wp-content/plugins/super-forms/uploads/php/files/282981382f34c787826bf2a0f91d6b8a/wifiwinavaxukubakejaveruz.pdfIn PDF document text
    • http://bernendorf.ru/userfiles/file/memikiv.pdfIn PDF document text
    • http://wypelnienia.kratex.pl/wp-content/plugins/super-forms/uploads/php/files/933f8e364929df5f4abcd31542bc6138/vinerukiwez.pdfIn PDF document text
    • https://dedywiredja.com/wp-content/plugins/formcraft/file-upload/server/content/files/160839193d2510---vuzogawefevur.pdfIn PDF document text
    • http://1yunnan.com/ckfinder/userfiles/files/xowevireri.pdfIn PDF document text
    • http://kingsauto-bar.com/js/upload/files/32064540695.pdfIn PDF document text
    • http://kmkonsult.cz/userfiles/file/guwetozixubabevosojil.pdfIn PDF document text
    • http://techbis.pl/files/file/15242684539.pdfIn PDF document text
    • http://opalbiosciences.com/wp-content/plugins/formcraft/file-upload/server/content/files/160841006eb736---42777536555.pdfIn PDF document text
    • https://fajndoktor.cz/images/file/files/detenulunukozedatu.pdfIn PDF document text
    • http://baaningdoi.com/file_media/file_image/file/fenotibu.pdfIn PDF document text
    • http://stellar.ru/ckfinder/userfiles/files/sukunofezadu.pdfIn PDF document text
    • http://modelkyujin.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081efa639507---jetotiba.pdfIn PDF document text
    • https://specialbrands.gr/wp-content/plugins/super-forms/uploads/php/files/2e6d05539275835e50722422fe1acb37/4228682762.pdfIn PDF document text
    • https://doellefjelde-mussemarked.dk/images/newsmail/file/12477121212.pdfIn PDF document text
    • https://polymadeniyaglar.com/fckeditor/userfiles/file/junolasanemirape.pdfIn PDF document text
    • http://mylodge-naoshima.com/81902670863.pdfIn PDF document text
    • https://www.lesson-online.org/wp-content/plugins/super-forms/uploads/php/files/9v8poevmb3vphqccrvltu5r486/88396535609.pdfIn PDF document text
    • http://easyreturn.store/userfiles/file/72078149696.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=sigma+sport+1200+manualPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d4fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4FE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ed0f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED0F 16060 bytes
SHA-256: 64af0185a2beffa7382febdf957b2ddd2015d3985e5bc97cf8ad64f3c2914973
font_02_sfnt_off00010220.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10220 20264 bytes
SHA-256: c1c4c4c7ac47a8b273416971bfe9c73cccd9cd0564d1f2bc2207d6b34c6a13c2
font_03_sfnt_off000136e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x136E3 10932 bytes
SHA-256: c5084468cab32c0358c2232d6a5bf1f6a1ec722bc753f7ae0c50df0ed6a1c3d1

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