Malicious PDF — malware analysis report

Static analysis result for SHA-256 296e1a66a6c2d430…

MALICIOUS

PDF

83.7 KB Created: 2021-09-05 09:15:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 5003692be6ce4710e476fefd2b1f4678 SHA-1: e5c6ec9cf31b9fbecdd2d6e58b25180c7e5d39b8 SHA-256: 296e1a66a6c2d430cdc50ce767ff1bbbeefb6ea0364b18ea63ee072de1d088a2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised WordPress upload directories, indicating a link farm designed to obscure the ultimate destination. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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.ideaklinikkadikoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b3737f0063b---durijaton.pdf In PDF document text
    • http://adabaskimerkezi.com/upload/file/bewawilepuzafititalefodu.pdfIn PDF document text
    • http://canxetaidientu.com/images/file/58573802330.pdfIn PDF document text
    • http://mijneigenlift.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160bdf4a5be286---neketelezegekuz.pdfIn PDF document text
    • https://husvagnsexpo.se/wp-content/plugins/formcraft/file-upload/server/content/files/160d55b5aa2c6a---duwovuxixota.pdfIn PDF document text
    • http://sshs61.com/clients/6/60/60e739d5a8cf4a6710e4f064fd99417d/File/jisutopijoni.pdfIn PDF document text
    • http://tele-klass.ru/i/upload/files/54583052253.pdfIn PDF document text
    • https://drivingschoolofnorthtexas.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091baecdfd1e---jokagebalimuwigefarux.pdfIn PDF document text
    • http://naosgym.com/userfiles/files/4756568226.pdfIn PDF document text
    • https://okinawa4d.com/contents//files/ruroguwotoj.pdfIn PDF document text
    • http://21cedu.com/pds/userfiles/files/xavizekuvufelajokiniwar.pdfIn PDF document text
    • https://evg-prague.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607e09ae81371---wufegojarejulu.pdfIn PDF document text
    • http://shreyaghoshal.com/konadnew/userfiles/file/80905578400.pdfIn PDF document text
    • http://gonuldoviz.com/upload/ckfinder/files/17600999636.pdfIn PDF document text
    • http://myarrahnu.com/mo_images/files/89507940524.pdfIn PDF document text
    • http://jirehenl.com/userfiles/file/060201463669.pdfIn PDF document text
    • http://finsura-lifedirect.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608d8c2f74c3a---41636689248.pdfIn PDF document text
    • https://digireg.nz/upload/vugukujupewak.pdfIn PDF document text
    • https://ctsgroups.asia/images/file/towaxotuwukevu.pdfIn PDF document text
    • https://fieldofgreen.com/wp-content/plugins/super-forms/uploads/php/files/a75df5f0ee5416ef64e5aadf4d02ae28/joforatokupokusejupu.pdfIn PDF document text
    • http://master-sign.ru/ckfinder/userfiles/files/figolezus.pdfIn PDF document text
    • http://www.medicalalliedtraining.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073d2424c2a7---dutina.pdfIn PDF document text
    • http://gcoekmr.org/cukashmir/User_Files/imagefile/45249680846.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=hillbilly+elegy+introduction+pdfPDF 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dd25.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD25 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f53c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF53C 10812 bytes
SHA-256: f0ffd8c153aac40c9bca5fdda6e30782f80025945512732b110bcd1c9d904f18
font_02_sfnt_off00010dc7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DC7 20460 bytes
SHA-256: c0d60cf887bdb0bb562141754ec37c23e197232288615f80b2d6b872cf7a1e86

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