Malicious PDF — malware analysis report

Static analysis result for SHA-256 a3ab7765bad32636…

MALICIOUS

PDF

86.0 KB Created: 2021-06-28 23:10:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 0c1f6ad4f081307dbc60e5bb580e5752 SHA-1: 8e4e8db85747ab9e053a1f84b572345b0ea62cfb SHA-256: a3ab7765bad326361b01798468ee0c55a897e138476184f99b7f6c098235de58
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. It functions as a link farm, containing numerous embedded URLs that point to various websites, some of which are hosted on compromised WordPress installations. The primary purpose appears to be directing users to potentially malicious content or phishing sites.

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://queure.ru/uplcv?utm_term=basic+english+vocabulary+words+with+meaning
    • https://bilbox.es/wp-content/plugins/super-forms/uploads/php/files/42bd63d191779181a5ae38d46cd6c6e4/77266127439.pdf
    • https://tahitotfaluovodak.hu/ckfinder/userfiles/files/53600641737.pdf
    • https://oknoplus-omsk.ru/wp-content/plugins/super-forms/uploads/php/files/0d0a07b7360549416ef7273834fb5a07/gebedutuwudujawosebotaku.pdf
    • http://upoart.com/ckfinder/userfiles/files/78992635455.pdf
    • https://hsegroup.ru/wp-content/plugins/super-forms/uploads/php/files/sde131c8tbs7o40qhev1ob2a74/katanabajovatofepi.pdf
    • https://happycustomerservice.com/wp-content/plugins/super-forms/uploads/php/files/4c28c3d3188b53280e232b79488ecf25/36967290960.pdf
    • https://weilaimachinery.com/userfiles/files/90177596568.pdf
    • https://divorcioconsensual.com.br/wp-content/plugins/super-forms/uploads/php/files/19b6f2e1b4cf5b14bff4bc87eecf5dbf/8882020550.pdf
    • https://nscs.org/wp-content/plugins/super-forms/uploads/php/files/86c3a43ffb0bbbf18aacba0b7cd5a0e7/kuxusizugovujinukazi.pdf
    • https://dixietemporarystorage.com/wp-content/plugins/super-forms/uploads/php/files/ef775e89fa6bbdc4bbaca391e81473ce/fogilalewozer.pdf
    • https://picinterior.com/ckfinder/userfiles/files/25267494433.pdf
    • https://buddingheights.org/wp-content/plugins/formcraft/file-upload/server/content/files/16088610b34a18---22069483867.pdf
    • http://www.loicadesacavem.pt/wp-content/plugins/formcraft/file-upload/server/content/files/160869540d5a04---rawaka.pdf
    • https://torgradio.ru/new/files/file/kakifuzogumobutubuveg.pdf
    • http://bloomx.com/sites/all/sites/bloomx.com/files/wigazemubax.pdf
    • http://www.cuadernos.in/wp-content/plugins/formcraft/file-upload/server/content/files/160d6837118263---mipajepufevoduvumife.pdf
    • https://thriveelearning.com/wp-content/plugins/super-forms/uploads/php/files/a128c2b0774b1e4168e9bd9e601a6b9f/begusojepoxabezififivub.pdf
    • https://www.spreefahrten-berlin.de/wp-content/plugins/super-forms/uploads/php/files/lbqpgi8ikilbk1vvk0ik27230g/mavudisilawafumufeke.pdf
    • http://www.kzhep.in.ua/wp-content/plugins/super-forms/uploads/php/files/q3tp7hv0l1oqq0l7lmq1oo47i6/lejamefatave.pdf
    • http://tdfinalists.ca/clients/43449/File/lalufemusufojovubakogurak.pdf
    • https://webtraffic.ch/wp-content/plugins/super-forms/uploads/php/files/leqf11da7ngnf0lnki59l3hh62/dafapirakofodi.pdf
    • http://sad-azov.ru/wp-content/plugins/super-forms/uploads/php/files/3ab29a8448e936b66db66ab37b150bad/61573358137.pdf
    • http://fabrykakonwersji.pl/wp-content/plugins/super-forms/uploads/php/files/c204b244ad9c33fad834e7e87e84883a/vuwodufixekobefazaxolopuv.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_off0000e92b.bin
cfe252a33aed4c0a9a379f6d7d705d5b9455c764b879fae8727a15d4a673f345
pdf-font-stream PDF embedded font (sfnt) at offset 0xE92B 17444 bytes
font_01_sfnt_off00011627.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11627 16792 bytes
font_02_sfnt_off00012e3e.bin
a8320bf473e54d290a706eabc40f2c4fdc5e66f26dc3f5a9601f2c2d18b1a20b
pdf-font-stream PDF embedded font (sfnt) at offset 0x12E3E 11376 bytes