Malicious PDF — malware analysis report

Static analysis result for SHA-256 a9fa75c322eb0b53…

MALICIOUS

PDF

71.2 KB Created: 2021-09-03 07:11:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: f63988a057ee8d935950fc15a8916159 SHA-1: abb660ccfd7380e9934d42e00982c0b139bf9747 SHA-256: a9fa75c322eb0b53704f5e1a002385ffc8b0dd9291051b3aaaafa7e9cc3db9ff
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which are hosted on compromised or disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. The embedded JavaScript is a common technique for exploiting PDF vulnerabilities or initiating further malicious actions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 7

  • 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.
  • 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 https://cructi.ru/uplcv?utm_term=islamic+books+free+download+pdf+urdu PDF link annotation
    • http://border-collie.ru/sites/default/files/file/22824484184.pdfIn PDF document text
    • https://nepalipublisher.com/ckfinder/userfiles/files/23870588638.pdfIn PDF document text
    • http://cnkls.com/userfiles/file/1626383624.pdfIn PDF document text
    • http://pavcargo.ru/wp-content/plugins/super-forms/uploads/php/files/bb88d2d99360e609954fb79f6e84be24/kasufuxuvamanan.pdfIn PDF document text
    • https://cuisinescartier.ca/upload/editor/file/gekunomepumepexawijij.pdfIn PDF document text
    • http://jakebenmd.com/clients/0/0e/0eef9d569b11303d075d19626cc6f958/File/kodumegenevakut.pdfIn PDF document text
    • http://peoriamayorprayerevent.com/clients/1/16/166e3f524b51ec168ebfd48f86188a1d/File/21191112827.pdfIn PDF document text
    • https://glosunspa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160799b1d86970---kugajigovototufevaro.pdfIn PDF document text
    • http://guides2alpes.org/uploads/file/jipovaxanuwuturamo.pdfIn PDF document text
    • http://www.tsssport.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c1c0507f4f3---jamegajogunadam.pdfIn PDF document text
    • http://bowlingkillers.com/imgdb/files/rinanetalubanarobumexukus.pdfIn PDF document text
    • https://rotterdampools.com/contents/files/84683135117.pdfIn PDF document text
    • https://fiambreszav.com/wp-content/plugins/super-forms/uploads/php/files/7b6d2e558aa8a6e78445c4bf86481e3e/67645033769.pdfIn PDF document text
    • http://biaikatolikus.hu/files/file/4152536322.pdfIn PDF document text
    • http://toshiteriyakiburien.com/uploads/files/davarumajuduzonikutate.pdfIn PDF document text
    • https://minervatech.work/js/ckfinder/userfiles/files/noxujububexaropajiv.pdfIn PDF document text
    • http://kuehllawpc.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/19742999040.pdfIn PDF document text
    • http://ebiocell.com/uploadfile/file///2021072422583091.pdfIn PDF document text
    • https://grafitpoint.ru/wp-content/plugins/super-forms/uploads/php/files/6779b28ba19cb0708db7b4fc9ee003d0/73316001768.pdfIn PDF document text
    • http://nuraski.pl/wsg/userfiles/bisanefazipesasumil.pdfIn PDF document text
    • https://bykevin.com/wp-content/plugins/super-forms/uploads/php/files/67295591a8b02dbcab0155f380330d9d/papovef.pdfIn PDF document text
    • https://www.properties-thassos.com/wp-content/plugins/super-forms/uploads/php/files/sdv84isjml8c9avmc7an00gm9u/68904288999.pdfIn PDF document text
    • https://lisacutler.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d626c8fc3a---nizubitafa.pdfIn PDF document text
    • http://sl1971.com/clients/5/51/517263f0417f9379c67e6eba0e0bdfe8/File/bipajulemivufiwekagegew.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_off0000b56f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB56F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cd81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD81 15628 bytes
SHA-256: 361eb06b844d5db1565e2d3d2e82c6ff9dc88c977b360834e8492baa5403a144
font_02_sfnt_off0000f592.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF592 11052 bytes
SHA-256: 506e31477685b11d37423104bfd230f83b025446511d75d35f04813a0d38ada0

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