Malicious PDF — malware analysis report

Static analysis result for SHA-256 be640e04d63f23c9…

MALICIOUS

PDF

84.7 KB Created: 2021-07-07 11:24:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: d701ed014d44bbf48e567e89c4df21c0 SHA-1: e35040b3c87902a9502f97c77453e23ab4a3189c SHA-256: be640e04d63f23c9028e9fa482dd9259097375f84d75ce9b16915c65c5f8069c
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with many URLs pointing to compromised CMS uploads and disposable hosting. The document body is heavily obfuscated and unreadable, suggesting it is not intended for human consumption but rather to host these malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://beautifullifeuk.com/wp-content/plugins/super-forms/uploads/php/files/106ad8b672b4ba5f06e1d72cd9dcebda/tupimasuporinodake.pdf
    • https://burstallconrad.com/editor_files/file/10323746608.pdf
    • http://naasschoolofmotoring.ie/fckeditor/userfiles/file/pufopumemomopofapapum.pdf
    • https://elpmarketing.ca/wp-content/plugins/super-forms/uploads/php/files/ac21b6f9157986d1346280db014e1657/welemanesagatul.pdf
    • https://ilc.ua/wp-content/plugins/super-forms/uploads/php/files/tkqgtvl94b3va0eltcavvkd737/79261365515.pdf
    • http://wwm-quanta.com/upload/files/76763945526.pdf
    • https://timjanen.se/anvandarbilder/53/files/databilokepurozagan.pdf
    • https://janeunchained.com/wp-content/plugins/super-forms/uploads/php/files/03s06mf1fvakjips32e4t7rqr0/bujezifanopurufon.pdf
    • http://unsersohn.ch/images/file/mabiwepu.pdf
    • https://samsungklimalar.com/upload/ckfinder/files/35057649157.pdf
    • http://gopherandsquirrelcontrol.com/admin/images/file/61363361885.pdf
    • http://limpiasol.com/wp-content/plugins/formcraft/file-upload/server/content/files/160869b6217fc4---67399630453.pdf
    • https://rijst.nu/userfiles/file/vigamuxekadesutefesil.pdf
    • http://ambulatorioveterinariorigolon.eu/userfiles/files/tegimenifok.pdf
    • https://yidinfo.net/wp-content/plugins/super-forms/uploads/php/files/7183orfkgdmbn3c75p7jao8cid/muwiwen.pdf
    • http://muzeumostrowiec.pl/obrazy/file/62407147301.pdf
    • http://intestinalfortitude.org/clients/0/0c/0cf504f131cb0201443a7bd449519f4a/File/tixilinesit.pdf
    • http://coinproject.com/userfiles/image/file/bikubijuxujijawizija.pdf
    • https://bizdrive.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/16080e434a9e84---volarazase.pdf
    • https://www.anandtirth.com/wp-content/plugins/super-forms/uploads/php/files/bh29a6cat9gutgadio2e65bvd3/baxajanuv.pdf
    • http://hattingtoemrerogsnedker.dk/userfiles/file/87419580768.pdf
    • https://pavimenti.pl/web/uploads/files/naxagafami.pdf
    • https://eminencesolutions.in/resources/userfiles/file/bomufijusepokep.pdf
    • http://www.ausafrica.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160c851157fb7b---vokewamoxuje.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=organic+chemistry+clayden+greeves+pdf
    • 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_off0000e63e.bin
5bb438a6ce81970d68fe31527dff8c5c3dd603538dd7c85498f2eec4af226c7e
pdf-font-stream PDF embedded font (sfnt) at offset 0xE63E 11152 bytes
font_01_sfnt_off00010003.bin
5dd02eea79a66bde97a516884df4178dbde23033462a191944e72cb9e8fd21af
pdf-font-stream PDF embedded font (sfnt) at offset 0x10003 17532 bytes
font_02_sfnt_off00012d2a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12D2A 16792 bytes