Malicious PDF — malware analysis report

Static analysis result for SHA-256 bbdb931d3b3ea49d…

MALICIOUS

PDF

96.0 KB Created: 2021-07-07 16:47:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-17
MD5: 54818a54b2ae0f0a50018d14d9124604 SHA-1: 89afa5e32c59315b7acaf0f3b18ff252b2794c06 SHA-256: bbdb931d3b3ea49dd711e8266467077069aa038b33d68fe28d11bda0d5d0304a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The document functions as a link farm, with numerous embedded URLs pointing to compromised WordPress sites, likely serving as a distribution point for phishing or malware. The presence of external URIs and link farm characteristics strongly suggests an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9936

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://laborke.ru/uplcv?utm_term=old+age+quotes+wisdom PDF link annotation
    • http://osullivanspressurewashing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609332a01d53f---wozefo.pdfIn PDF document text
    • https://njsolarpower.com/wp-content/plugins/super-forms/uploads/php/files/b6e78aadcbb69690e037188ce7a0c107/17888866287.pdfIn PDF document text
    • https://www.frankcapassoandsons.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607421eab37d8---70422665699.pdfIn PDF document text
    • http://visualpaint.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074303c906e6---57235291155.pdfIn PDF document text
    • http://adamlegal.com/userfiles/file/29458594554.pdfIn PDF document text
    • https://iescolumbus.org/wp-content/plugins/super-forms/uploads/php/files/4f26cfdb98a85421ebe8a26bdce90790/luwotolus.pdfIn PDF document text
    • http://sun-eko.eu/files/file/80553351059.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/c5b329fe55350cca28e76de88e634043/soxezunutepenelaniwebiraf.pdfIn PDF document text
    • http://jirehenl.com/userfiles/file/2822430053.pdfIn PDF document text
    • http://queuemanagementsystems.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9b5f7a3a30---dejemofujosigivaxi.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609f7794113d3---tewajojake.pdfIn PDF document text
    • https://shriramsteels.in/public/ckfinder/userfiles/files/97291563910.pdfIn PDF document text
    • https://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e0dc9c5e4b---fupadoberelerunu.pdfIn PDF document text
    • http://ufnk.fr/app/webroot/files/file/bebewamexaj.pdfIn PDF document text
    • https://99shayari.in/userfiles/files/rapofoxewafufov.pdfIn PDF document text
    • http://www.psstrecno.sk/wp-content/plugins/formcraft/file-upload/server/content/files/16083821350857---suzefoxodonawobidepokiti.pdfIn PDF document text
    • http://videoacceso.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c75988551a3---bobezalezukabevaxulun.pdfIn PDF document text
    • http://yuanyoujie.vip/userfiles/file/34791268471.pdfIn PDF document text
    • http://flightshop.jp/images/blog//file/lemutalekumimesisazudix.pdfIn PDF document text
    • https://tractorpulling-emmeloord.nl/upload/file/84236273788.pdfIn PDF document text
    • https://www.scanworld.se/wp-content/plugins/formcraft/file-upload/server/content/files/160ac8fdfc5b62---41589477759.pdfIn PDF document text
    • https://oneremote.ru/wp-content/plugins/super-forms/uploads/php/files/ecc271e510d1014ffc972b5f557dd2b6/karemume.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/jln094as08ftii8e9n6mp933q6/vubafolizakazupazupoge.pdfIn PDF document text
    • http://tuzvedo.hu/elemek/file/82617890527.pdfIn PDF document text
    • 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001161f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1161F 10744 bytes
SHA-256: 91009f3ab1f8891678f706f5d9d08c0ba268ecff93c7f6c94fb6f935b06e261a
font_01_sfnt_off00012e65.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E65 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014677.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14677 17248 bytes
SHA-256: 94b49652aebf682bac81633db0722f84376b5156272f40e8293572675a8d9041

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