Malicious PDF — malware analysis report

Static analysis result for SHA-256 b74af92fabcc2b6d…

MALICIOUS

PDF

83.8 KB Created: 2021-06-29 21:15:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 14b9c8a4ede59280d43ad3d6a0437998 SHA-1: 3014c2f95c99f8c0ff7c737d10b6c848778c754b SHA-256: b74af92fabcc2b6d307e637da10a349ea121a660e5aa189b011b5856594fed30
156 Risk Score

Malware Insights

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

The PDF contains a large number of links, many of which point to websites that appear to be compromised CMS upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The file's structure and numerous external links suggest it's designed to lure users to potentially malicious content hosted on various domains.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

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://bright-mineral.com/uploadfile/file/2021052718380231.pdf
    • https://cissud.eu/uploads/ck_editor/files/zarufiritenikix.pdf
    • https://maggies-handmade.com/UserFiles/files/12963805785.pdf
    • http://limpiasol.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d97805fa53---90763893613.pdf
    • http://irmascaritasdejesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/16090b39f8586f---27360679029.pdf
    • http://www.lauricedale.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160a21638b2752---32190816095.pdf
    • https://stopserv.ru/files/file/18251135232.pdf
    • http://saamfactory.com/wp-content/plugins/super-forms/uploads/php/files/b491a2c063bb82d55081f5eae020068a/nupudezoninotoxaxevew.pdf
    • https://gccpay.net/wp-content/plugins/super-forms/uploads/php/files/65ca242337e82e45910a484308f54774/mofelitiwiguzuvamalozaxe.pdf
    • http://africanhairbraidingsalon.com/userfiles/file/50946813372.pdf
    • http://euro-ex.com/images/blog//file/jexukesamapadepizemal.pdf
    • http://www.liveartsaskatchewan.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608703958a2ae---gurixozolisasepome.pdf
    • https://lynnesnaturaltreats.com.au/wp-content/plugins/super-forms/uploads/php/files/c8f683757e7d7a5dff790bbc83144383/67137679229.pdf
    • https://thuaphatlaihanoi.net/uploads/files/dasupalimajeke.pdf
    • http://firmykominkowe.pl/Obrazki/edytor/file/tudukavedo.pdf
    • http://skolicka.eu/foto/images/file/74449730619.pdf
    • https://noukos.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16076038a95a4b---zesujofaberakulekiwelo.pdf
    • http://taiwanglassgroup.cn/userfiles/file/91269185896.pdf
    • https://www.shopveriamici.com/wp-content/plugins/super-forms/uploads/php/files/l2rsj7feol6iotbcs9eacu23b8/teguvujefajedazasejoz.pdf
    • http://www.louthadventures.ie/wp-content/plugins/formcraft/file-upload/server/content/files/160be5881e4932---pobosewitujatuner.pdf
    • https://thejasmineway.net/wp-content/plugins/super-forms/uploads/php/files/7b46bvd0tmf8cb0q4ute1bchle/nutowutofedavu.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=vedas+and+agamas
    • 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_off0000e9bb.bin
18272de64af22e24ff414ed5f6ef826374a1448f164b77ae8308bc39dc84dfb8
pdf-font-stream PDF embedded font (sfnt) at offset 0xE9BB 10104 bytes
font_01_sfnt_off00010001.bin
a68f44d4f07f1c717c8dca21bd3407b7c46e3a7fd5b771455664d60bedc87696
pdf-font-stream PDF embedded font (sfnt) at offset 0x10001 16604 bytes
font_02_sfnt_off00012ad5.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12AD5 16792 bytes