Malicious PDF — malware analysis report

Static analysis result for SHA-256 397aa3e7a00ef0c0…

MALICIOUS

PDF

93.4 KB Created: 2021-07-05 21:31:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 4bec7665ba7ed40f71d7c479283d1e20 SHA-1: 969af9ea96eaf25947b4bcc5933fbd81eba202f7 SHA-256: 397aa3e7a00ef0c0632818401d0d6041913fae5111fa504be81826026c22384d
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to 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 distributing further malware. The presence of multiple PDF link farm heuristics reinforces this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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 http://biotledlight.com/userfiles/file///75185427267.pdf
    • http://lab4050.com/upload/editor/file/godevizowabot.pdf
    • http://pulsrmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac4dcf4bc8c---36540104357.pdf
    • https://autotrans911.com/thread/admin/uploads/file/85850152156.pdf
    • http://matsusushionline.com/uploads/files/52329247189.pdf
    • http://runo34.ru/attachments/file/68125262748.pdf
    • http://ongnuocdenhat.com/upload/files/fanudemiwuredidonojabez.pdf
    • https://agilitynd.com/wp-content/plugins/super-forms/uploads/php/files/5f666581f9f52e363e80c65350043b8f/49790887481.pdf
    • https://alajuusa.ee/media/contents/file/89886013800.pdf
    • https://harrisitalia.it/uploads/file/duwelusidaxuzenu.pdf
    • https://jahanchart.ir/data/files/file/natilogematofo.pdf
    • http://www.cascinasorigherio.it/wp-content/plugins/formcraft/file-upload/server/content/files/160c47cc9c6f20---vefezumu.pdf
    • https://castilloexterior.org/ckfinder/userfiles/files/42344663303.pdf
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/1rvm60j4tubim4c8fvvkb35pdu/28550340924.pdf
    • http://lab4050.com/upload/editor/file/nofenimutefis.pdf
    • https://visionbrindes.com/admin/fckeditor/userfiles/file/loxexaledikime.pdf
    • http://www.ibadirect.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b5f650b1ca9---woralowowujirawezafo.pdf
    • https://www.ayersworthglen.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c2a23ea94d---zenazamikunemol.pdf
    • https://technok.cz/wp-content/plugins/super-forms/uploads/php/files/22aba888e58ae4dd33986719244f5745/55759549454.pdf
    • https://bokseinstituttet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160a3bcb4be419---timiviwasabuwopuxog.pdf
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/0a3ksktinf07hpsq6lc0rc0c8t/20491425614.pdf
    • https://www.vibrationmonitoring.asia/wp-content/plugins/formcraft/file-upload/server/content/files/160ad7b26dcfd1---kinize.pdf
    • http://cestovni-postylka.eu/userfiles/file/12084777131.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=extreme+adhd+child
    • 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_off00010d5c.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10D5C 16792 bytes
font_01_sfnt_off00012573.bin
dd76c526d933801cd882c8c99eadb324e7d7aa766c8155e9bd34d24e68b372a6
pdf-font-stream PDF embedded font (sfnt) at offset 0x12573 10328 bytes
font_02_sfnt_off00013cb1.bin
c15c3144f678e82811fc9a40351f16b5d757fdd03ca12b4f9613d77bbaa87f80
pdf-font-stream PDF embedded font (sfnt) at offset 0x13CB1 17060 bytes