Malicious PDF — malware analysis report

Static analysis result for SHA-256 31d6087601c78017…

MALICIOUS

PDF

73.7 KB Created: 2021-07-15 23:43:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 6e28734a26e15e020d6affd6dd6ad546 SHA-1: 57b886e8e0306aaca7df0eedfda72aa78e75f3f2 SHA-256: 31d6087601c78017c11975aa9b0889ea4b21ab9bfb36e6c3a4bcf0818434dba5
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress sites and disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The presence of external URIs and link farms points towards an attempt to lure victims to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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://www.marbelitesa.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160c46ad545b8a---7920078124.pdf In PDF document text
    • https://mygenius.ru/admin/ckfinder/userfiles/files/sodagujuxosapozoxefekumin.pdfIn PDF document text
    • http://karimeh.com/public/userfiles/file/lorivovasidorixuduno.pdfIn PDF document text
    • https://www.blackandwhite-salon.com/wp-content/plugins/super-forms/uploads/php/files/6dd98255ff57de5b767abcd786bc3f96/newizinuropil.pdfIn PDF document text
    • https://www.nitdgp.ac.in/uploads/userfiles/files/80060982809.pdfIn PDF document text
    • https://tlproduct.com/userfiles/file/41191848622.pdfIn PDF document text
    • http://www.nowsingapore.co.id/wp-content/plugins/formcraft/file-upload/server/content/files/16079d91622689---mesuregu.pdfIn PDF document text
    • http://sys-svinding.dk/userfiles/file/mobukaxejegoriti.pdfIn PDF document text
    • https://www.helpforbusymums.com/wp-content/plugins/super-forms/uploads/php/files/92325f4a4ad44ba72cb2e79f117b981d/12490671719.pdfIn PDF document text
    • https://www.advids.co/wp-content/plugins/formcraft/file-upload/server/content/files/160700c02baba1---50281657156.pdfIn PDF document text
    • http://orgue-chantepie.info/FCKeditor/upload/file/pirepudamumonepitebikiwiz.pdfIn PDF document text
    • https://rebel-guitars.com/wp-content/plugins/super-forms/uploads/php/files/774193cb4b428e460d1e001da480d3bd/81156399736.pdfIn PDF document text
    • https://pyhm.ca/wp-content/plugins/super-forms/uploads/php/files/akq6sljt9gmi7e9sabh4omrog1/43272956975.pdfIn PDF document text
    • https://angelsstaff.com/uploads/file/dilidobesudodegonepulose.pdfIn PDF document text
    • http://chiengthai.com/file_media/file_image/file/94152586357.pdfIn PDF document text
    • http://chatfieldfarms101.com/userimages/4181262928.pdfIn PDF document text
    • http://dkyangmei.com/uploadfile/file/2021062910354773499.pdfIn PDF document text
    • https://pet-fashion.ro/mm/file/vusawazatasenalivurip.pdfIn PDF document text
    • http://aksaxena.com/bpms/includes/fckeditor_uploads/userfiles/file/fivuxoxefamigezexuka.pdfIn PDF document text
    • https://www.northwoodmedical.ca/wp-content/plugins/super-forms/uploads/php/files/jvnhulk0qvm2onlofote6ak9sj/wojag.pdfIn PDF document text
    • http://stardentalcare.org/userfiles/file/xilalunafiletizel.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=luther+memorial+chapelPDF 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000bbd6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBBD6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d3e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3E8 17040 bytes
SHA-256: 7c05a747b0ebf7645633a26f1ac002e4d89e83eb577b957ce916c32f481694a8
font_02_sfnt_off000100e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100E2 10424 bytes
SHA-256: c0cb8cae9bbeab4872a5ccc6c941c5290d492fbcad7e2bfca916f1f466d8d9cf

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