Malicious PDF — malware analysis report

Static analysis result for SHA-256 977d9aabe1d622f1…

MALICIOUS

PDF

86.4 KB Created: 2021-07-21 12:29:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: d59b49a044e652951922ff5ddfbf8bd8 SHA-1: a0b6ff87411ec0ca83dd366a518fe0dd53f8baa5 SHA-256: 977d9aabe1d622f19f4872456fcb5a59ed77eda6a69f88dcf31b4733d4a25147
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests the document's primary purpose is to host a collection of links, potentially to lure users into clicking on malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

Heuristics 6

  • 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.
  • 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://3duct.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a177be233ec---62957508805.pdf
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/a4a58d042bff940e82cfc1ad02efceaf/30306057540.pdf
    • https://www.superioreagle.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ff8564cac8---nawed.pdf
    • https://aliencosmicexpo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084a5a147471---tibimemupiputadir.pdf
    • https://www.amiunaorchestra.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160789e16427c9---koluviwovenuzebezeza.pdf
    • https://bursaceviritercume.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e003570f0e---pikirofilatamasow.pdf
    • https://outsourcedbackoffice.co.uk/wp-content/plugins/super-forms/uploads/php/files/0c5b822bbbdd111350ac0a9ddbefc296/kixuvukon.pdf
    • https://www.darrellstuckey.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c0a9d2ebd06---senopidujejidap.pdf
    • https://serwisnawigacji.pl/userfiles/file/96880807665.pdf
    • https://wcdt.co.th/wp-content/plugins/super-forms/uploads/php/files/17ld3vnsisdnharcognvfa5l0h/3318604203.pdf
    • http://crystal-lamp.ru/uploads/files/14148603922.pdf
    • http://princeworldwide.com/multimedia/userfiles/file/lasajesavim.pdf
    • http://phenix-security.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16092e9ca1d186---detafesufuzifoleposixo.pdf
    • http://www.zopfitravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bad86fe76ca---20012082453.pdf
    • http://janatalnajaf.com/basefile/janatalnajafcom/files/36779753249.pdf
    • http://ganan10.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160ad2b90757ea---94765779601.pdf
    • https://www.getfitcrew.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd2439772eb---64871275234.pdf
    • https://hopefor.today/wp-content/plugins/super-forms/uploads/php/files/be76d7d2860d3d2f4944c1748de6afbb/goxufobupolulowofi.pdf
    • http://www.ujepites.hu/userfiles/files/48694370518.pdf
    • https://www.brunosistemi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c955a72a63b---sekesonibugagagunubumeru.pdf
    • https://bibonatura.hu/ckfinder/userfiles/files/zexij.pdf
    • https://www.businesswatchguardingservices.co.uk/wp-content/plugins/super-forms/uploads/php/files/98qfk0oks5c063ictgvgql2ror/gukiwix.pdf
    • http://www.akutrans.com/wp-content/plugins/formcraft/file-upload/server/content/files/160946f56765c1---50108051176.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=hormones+from+parathyroid+gland
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000edd0.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEDD0 16792 bytes
font_01_sfnt_off000105e2.bin
052c540fb0864352e75682ecf264e5d4ac58a297308faabc5c5ccb436058b227		 pdf-font-stream PDF embedded font (sfnt) at offset 0x105E2 17104 bytes
font_02_sfnt_off000131a9.bin
b4f11ae17a0665674311796a7dbcc11cf56cca7a36fe78807f2414bd9558dcea		 pdf-font-stream PDF embedded font (sfnt) at offset 0x131A9 11048 bytes

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