Malicious PDF — malware analysis report

Static analysis result for SHA-256 fef4fae6080f4e4e…

MALICIOUS

PDF

82.2 KB Created: 2021-06-29 15:50:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 6fff3003e1aed3cc5c45dd0565fbe499 SHA-1: da26366d793a2756d86f9304a0ffbeb4cf73d2d2 SHA-256: fef4fae6080f4e4ed142039ce2a62c268394e237cbbf1e417d89afda736e3965
164 Risk Score

Malware Insights

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

The sample contains embedded JavaScript, a common technique for executing malicious code within PDFs. It also features a link farm pointing to multiple distinct hosts, some of which appear to be compromised WordPress sites, suggesting an attempt to obscure the final destination. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://dusunceokulu.net/resimler/files/67346209664.pdf
    • http://deltastal.ru/userfiles/file/tejovaduj.pdf
    • https://healthcareadvisorsgroup.com/wp-content/plugins/super-forms/uploads/php/files/3qmkj5llklnou3uqvf9rov29q3/masawinisoripafiva.pdf
    • https://heykidsletscook.info/wp-content/plugins/super-forms/uploads/php/files/e7c807792c26142a4c9ce846c44c20f5/volekexazeribibejakagofu.pdf
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/c4fb444ac321365f8eda0c987d15106e/91514988698.pdf
    • https://voicelux.ru/wp-content/plugins/super-forms/uploads/php/files/62b908580be74bb4d6928ad300477bd4/70806891527.pdf
    • http://aromamahabaleshwar.com/ckfinder/userfiles/files/78073595435.pdf
    • http://www.risingstars.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16095782331ec2---87524408245.pdf
    • https://oiweld.com/wp-content/plugins/super-forms/uploads/php/files/ffab56d4c59d3e5cb91aad6b1ab9fa39/dutevudijakez.pdf
    • http://www.molinoag.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a7ebca7964---42949941020.pdf
    • https://www.advids.co/wp-content/plugins/formcraft/file-upload/server/content/files/160ba4e03d8dd6---tiwutemogezubapelojajeji.pdf
    • https://noble-worldwide.com/wp-content/plugins/super-forms/uploads/php/files/72ae2809a6edef5c5665f746a0eeb15b/92105080425.pdf
    • http://mitsubishilongbien.vn/images/ckeditor/files/kisezirelupemagako.pdf
    • https://ddriu.hu/wp-content/plugins/super-forms/uploads/php/files/92e9e5f41dc759aa21e7e8ee130d9b7b/zovukifujokojodigixe.pdf
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/dslauu28kp5oq8pfiekrj589m1/22818706388.pdf
    • http://bloomx.com/sites/all/sites/bloomx.com/files/luwafarofex.pdf
    • http://asupuro.com/user_data/image//file/xajidelupuninatumivu.pdf
    • http://hiace-yoshikawa.com/js/upload/files/welirago.pdf
    • http://www.champcaregivers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160810d1c8f3ae---wesukesasononukupevotuku.pdf
    • http://ellev.fr/upload/files/kutebezaxemezikakexojo.pdf
    • http://plusbateria.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609aeb4a5c914---vedovatitepewolosogefe.pdf
    • https://cremeconferences.com/wp-content/plugins/super-forms/uploads/php/files/c0c9e6ca387a4636375ce09095f85830/7866748557.pdf
    • http://osullivanspressurewashing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb50fca6f6c---25209934549.pdf
    • https://www.advids.co/wp-content/plugins/formcraft/file-upload/server/content/files/1609ffdeb2dd8f---vexoz.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=pdf+lonely+planet
    • 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_off0000ded4.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xDED4 16792 bytes
font_01_sfnt_off0000f6eb.bin
825701050d036ac9b52215a4f361d8874f083f27063839ebb3063ddba0669352
pdf-font-stream PDF embedded font (sfnt) at offset 0xF6EB 10244 bytes
font_02_sfnt_off00010e17.bin
34d11af7ce9638a6e2747b2d7362c28eaccf51d23856e5565f458a7169aebf2a
pdf-font-stream PDF embedded font (sfnt) at offset 0x10E17 17444 bytes