Malicious PDF — malware analysis report

Static analysis result for SHA-256 d90d35b85a653c80…

MALICIOUS

PDF

104.3 KB Created: 2021-06-30 13:24:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: fb3f74e888874c051ee00a6fbe14a901 SHA-1: 035aa09044dc964a9814cdefe346276da427071d SHA-256: d90d35b85a653c80afcfbedfd6aa59d5d7ca3920283f5fb3d2caa75442ee5baa
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains embedded JavaScript and a link farm pointing to multiple compromised WordPress sites, suggesting it's designed to redirect users to malicious content. The presence of embedded JavaScript indicates potential for further exploitation or payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9737

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 http://opakowania-loga.pl/zdjecia/fotki/file/zepefisupixuxikoj.pdf In PDF document text
    • http://sts-logistika.ru/wp-content/plugins/super-forms/uploads/php/files/a212a1996e81bead4bf94b9d79c6fe05/46583660818.pdfIn PDF document text
    • https://glass-haus.ru/wp-content/plugins/super-forms/uploads/php/files/9b08b613cfd6cd2fcf5ed2a6745ad681/40378342106.pdfIn PDF document text
    • https://www.ikedatosou.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d735f64352d---laxizotarawuvokolobovaw.pdfIn PDF document text
    • http://www.gametimecatering.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa4ed03e36e---10751936999.pdfIn PDF document text
    • https://www.truesdalepainting.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b7d9aeb173---dewizebisas.pdfIn PDF document text
    • https://hafa-verein.de/wp-content/plugins/super-forms/uploads/php/files/fa6861d25a42e9e62298f88844243615/35899086524.pdfIn PDF document text
    • http://eltonltd.ru/sites/default/files/uploads/88212898238.pdfIn PDF document text
    • http://capesociety.ca/uploads/files/nagizivopunamuvozeler.pdfIn PDF document text
    • https://www.sadcmedia.com/wp-content/plugins/super-forms/uploads/php/files/r0sgase64ee917m5e7t5f9gcf4/nuzepobovukero.pdfIn PDF document text
    • https://pametnidom.hr/pametne_kuce/userfiles/file/53007614931.pdfIn PDF document text
    • https://sipsib.ru/wp-content/plugins/super-forms/uploads/php/files/5cd5be1fafa881716e34f7d641df8a69/sepuw.pdfIn PDF document text
    • http://bagpack.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/1607263696df87---83279297552.pdfIn PDF document text
    • http://animationcoach.com/userfiles/file/28763967039.pdfIn PDF document text
    • http://broadgatecapital.com/userfiles/file/takunefurifexolesunovup.pdfIn PDF document text
    • http://gat-asset.com/CKEdit/upload/files/varidisivixap.pdfIn PDF document text
    • http://www.guaitoli.eng.br/wp-content/plugins/formcraft/file-upload/server/content/files/160bf79b6d6a92---zopolesufulinotugekufegex.pdfIn PDF document text
    • http://adanateknikservis.web.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1609c42ba6a79c---punepaditozi.pdfIn PDF document text
    • http://to-kajihan.net/js/upload/files/raxikoziwekuj.pdfIn PDF document text
    • http://themultifold.com/wp-content/plugins/super-forms/uploads/php/files/i0vkrn3nok93uov2blrmrqr8g0/20250226709.pdfIn PDF document text
    • http://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ed4b762958---44653106792.pdfIn PDF document text
    • http://math-talk.kr/wp-content/plugins/super-forms/uploads/php/files/ana27vkqc8j3eu36nml53a6j77/88139217009.pdfIn PDF document text
    • https://inchirieriavioane.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607ed48f36200---55152917165.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=meaning+of+georgePDF 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000efea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFEA 17004 bytes
SHA-256: 64727a2031e19ed0c4d601845d21c079be558c280ddc15f471b36482e7edd30d
font_01_sfnt_off0001089d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1089D 10068 bytes
SHA-256: ed586cfd0e8bde9eaa5b4a693f21388f99c63856a2f61b7951437dabdb5b373d
font_02_sfnt_off00011f1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F1B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00013728.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13728 2584 bytes
SHA-256: 3320eaa72eba948dd2b8d90c7b894408695e5661f80d075f6437452fd614a2d0
font_04_sfnt_off00014240.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14240 35056 bytes
SHA-256: c2802d60024fb364aeb90b0f75fb7b4d5ebbf411ca61521a6315ad3c7f431220

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