Malicious PDF — malware analysis report

Static analysis result for SHA-256 a107f32bfcf2d1e0…

MALICIOUS

PDF

86.4 KB Created: 2021-07-02 17:44:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 1488138cf073ed7e589071ac5cdb6c1a SHA-1: 80ce892171664b7047ef756c03457e0689b43d20 SHA-256: a107f32bfcf2d1e03e89a11cdd772f3372aaf95932ea22c0be8d70eb4bfa6846
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links, many pointing to compromised CMS upload storage and disposable hosting, suggesting it functions as a link farm to distribute malicious content or phish users. The presence of external URIs and link farm heuristics strongly supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://mygamedaysports.com/wp-content/plugins/super-forms/uploads/php/files/d607d040fccc5ef9c70e79e8699e51de/78802421581.pdf
    • http://orgue-chantepie.info/FCKeditor/upload/file/nerupexibariwuseluta.pdf
    • http://i-daa-wl.de/userfiles/rixesenuxadidiri.pdf
    • https://malimbe.africa/wp-content/plugins/super-forms/uploads/php/files/041ad784f47b70ffa6516e1059ef2dc2/zesaligigepukiripezawotuj.pdf
    • http://ampletrekking.com/userfiles/file/20828204653.pdf
    • http://neuragen.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160b6aa7e8a3a1---31987922639.pdf
    • http://www.cuadernos.in/wp-content/plugins/formcraft/file-upload/server/content/files/160a1be63e9e66---bunafatakola.pdf
    • https://accuratesearch.com/userfiles/file/vaxolaxivexino.pdf
    • http://kagoshimakojintaxi.com/userfiles/file/55633884752.pdf
    • http://careerhack.net/wp-content/plugins/formcraft/file-upload/server/content/files/160893d235bb55---2353454779.pdf
    • https://wholisticvibrations.com/wp-content/plugins/super-forms/uploads/php/files/504d377789d09f5e6c7cfe1d7eba4b60/7509179636.pdf
    • https://alexandrapanayotou.com/web/images/static/file/nudag.pdf
    • https://eliteswimmingpoolsinc.com/wp-content/plugins/super-forms/uploads/php/files/mcapko269s4g5tkp6qksfr23r3/puxumop.pdf
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609fdf659ccba---worotubixuvip.pdf
    • https://comesa.com.pe/wp-content/plugins/super-forms/uploads/php/files/cgev465l4kfimt5f82s7uumg97/82468824000.pdf
    • http://dental1970.com/clients/5/52/52cfbc2c58cc98a1938bca6351e90795/File/8237748205.pdf
    • https://www.mercato.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160cb1e48e954e---fapenubaxobewogufugabosis.pdf
    • https://sip7.pl/autoinstalator/sip7.online/wp-content/plugins/super-forms/uploads/php/files/62504d7361d6960075b06144c0888013/87558670890.pdf
    • http://eatatrudy.com/uploads/files/22051159278.pdf
    • http://jnnycc.org/userfiles/file/kefaporedek.pdf
    • https://zazilha.com.mx/wp-content/plugins/super-forms/uploads/php/files/e4f3d921c994244db465d46ccf00e2b7/43233669452.pdf
    • http://www.herbertvanderbrugghen.nl/draft/54653235512.pdf
    • http://robalton.es/Albums/images/file///59712284956.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=avril+lavigne+see+you+later+boy
    • 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_off0000ebae.bin
f1239e78096840839c0b2b662062bd278e23d185f1fb57715dfb904540fae1db
pdf-font-stream PDF embedded font (sfnt) at offset 0xEBAE 18056 bytes
font_01_sfnt_off00011b5a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11B5A 16792 bytes
font_02_sfnt_off00013371.bin
ea9cbbffb65560904bd139ee88a609668a824d8fe931443490005f894603ebf9
pdf-font-stream PDF embedded font (sfnt) at offset 0x13371 10684 bytes