Malicious PDF — malware analysis report

Static analysis result for SHA-256 c547e332d1aa3bfa…

MALICIOUS

PDF

83.1 KB Created: 2021-08-16 20:20:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: f3ab9079f457d6ddb3a83a7027ec54e5 SHA-1: 4fe344e3c997c7944143c4ce66e0ea06eb23694e SHA-256: c547e332d1aa3bfa952a58215da901e2c3ba951c7c6a250c858efe82a20a227b
172 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains embedded JavaScript and multiple external URLs, some of which point to compromised WordPress sites and are part of a link farm. The presence of a 'download button' heuristic and the ML classifier's high confidence score indicate a malicious intent to trick the user into downloading a payload. The embedded JavaScript likely facilitates the download or execution of further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

Heuristics 8

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://inwebjor.ru/uplcv?utm_term=how+to+install+hp+4500+printer+without+cd PDF link annotation
    • https://relaxationplusmn.com/wp-content/plugins/super-forms/uploads/php/files/c4614d938d79367eb1f19c75cb75db0f/71750953573.pdfIn PDF document text
    • https://bataretak.com/img/files/file/taralapanud.pdfIn PDF document text
    • https://hondamienbac.vn/userfiles/file/tusarajebowoveguva.pdfIn PDF document text
    • http://jarosi.hu/files/file/birowejitiranogavizaga.pdfIn PDF document text
    • https://chocoinmobiliario.com/wp-content/plugins/super-forms/uploads/php/files/9c85c738ccabdc15c48c2f823833b73b/71833831745.pdfIn PDF document text
    • http://drapa-technika.cz/UserFiles/File/97070880978.pdfIn PDF document text
    • https://deconkhoemanh.com/wp-content/plugins/super-forms/uploads/php/files/05m8o801adf2jhhgc6sqfo8u16/25940544538.pdfIn PDF document text
    • https://nepalipublisher.com/ckfinder/userfiles/files/pegevut.pdfIn PDF document text
    • https://www.pfgpartners.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16100d8e3dc109---sobemofiluvurefokerixad.pdfIn PDF document text
    • https://www.basur-tedavisi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607eb56fd5181---65362078806.pdfIn PDF document text
    • http://blankheich.de/images/uploads/file/kununu.pdfIn PDF document text
    • http://test.uebersetzungen-nesselberger.de/wp-content/plugins/formcraft/file-upload/server/content/files/16094881097296---nakegisosajanofepuzawolo.pdfIn PDF document text
    • http://www.benyowsky.com/resources/files/xanekiden.pdfIn PDF document text
    • http://n2nnetworks.com/files/others/92924901259.pdfIn PDF document text
    • http://atsrealtyvietnam.com/upload/files/bemifabobufoforo.pdfIn PDF document text
    • http://sincaremedicaltour.com/js/upload/futijox.pdfIn PDF document text
    • http://adaviestransportltd.com/userfiles/file/tefixivasekuxopaguxod.pdfIn PDF document text
    • https://www.northernillumination.com/wp-content/plugins/super-forms/uploads/php/files/f19f4805b713e877cf9b04194ac70be1/jiwabuwibexakak.pdfIn PDF document text
    • http://sanitaerprofi.ch/fckeditor/editor/images/file/mubofoviwidarepepugine.pdfIn PDF document text
    • https://angkaganjil.com/contents//files/degutulojomorutafemato.pdfIn PDF document text
    • https://forumhotel.by/wp-content/plugins/super-forms/uploads/php/files/t8bp6fg327me7j8e62cblfn9n5/luzitawup.pdfIn PDF document text
    • http://m2m2design.com/userfiles/5086380218.pdfIn PDF document text
    • https://alirezamirmohammadi.com/images/upload/files/10258018326.pdfIn PDF document text
    • http://alpha-th.com/userfiles/file/8473065676.pdfIn PDF document text
    • http://tms-operation.com/upload/files/runemirub.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_off0000e069.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE069 16356 bytes
SHA-256: 96d67f6c326031e302a76068126e9a6643627294ce85c4772b71898092ae199c
font_01_sfnt_off00010b16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B16 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001232d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1232D 11120 bytes
SHA-256: 77849012cfe8af8a060270bd277fb74b0efe1f88308e29769691a1d9650c5700

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