Malicious PDF — malware analysis report

Static analysis result for SHA-256 2b772f1a9d46b9f0…

MALICIOUS

PDF

79.4 KB Created: 2021-07-27 18:45:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 9da965169b39a07aee86c4c8ca7db240 SHA-1: 464b6ffd5a1803182990ba0e82f7b55bc9ddf56e SHA-256: 2b772f1a9d46b9f0d270975ad83c9d59ecc7b0db140f809bb4bb72a37816038a
156 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded URLs, many of which point to disposable hosting or compromised CMS upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lure users to malicious sites through a link farm. The document body is heavily obfuscated and unreadable, preventing further analysis of its specific content or purpose beyond being a link aggregator.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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://www.urbanwaterways.info/files/tipefubu.pdf In PDF document text
    • http://nhadatv.com/webroot/img/files/5693173328.pdfIn PDF document text
    • http://goodwynva.com/clients/d/de/de91e19d235d8a3764238851c6b73f99/File/22796792339.pdfIn PDF document text
    • http://yameitecl.com/ckfinder/userfiles/files/20210702_083448.pdfIn PDF document text
    • http://www.nestroots.com/wp-content/plugins/super-forms/uploads/php/files/etme36v20pn90tv6fe7m9hchn3/15993182158.pdfIn PDF document text
    • https://bienenaktuell.com/sites/bienenaktuell.com/files/file/dukunu.pdfIn PDF document text
    • https://panificiopasticceriabattaglia.it/file/zatijagexewetojukolatovu.pdfIn PDF document text
    • https://www.ndgai.com/wp-content/plugins/super-forms/uploads/php/files/rnaveih8h6t318trjjkeh1j8uv/wofajapakevosoten.pdfIn PDF document text
    • https://masterok-kovka.ru/wp-content/plugins/super-forms/uploads/php/files/b3e7e3fb07155b47360e7a4f8e8178e9/vobegurojix.pdfIn PDF document text
    • http://asiadomainstore.com/userfiles/file/duteliguronawofitiwuk.pdfIn PDF document text
    • http://artmetinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa011d7a69d---58127584853.pdfIn PDF document text
    • http://www.patricktennis.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a060a79a47f---22827981450.pdfIn PDF document text
    • https://cvconstructionsgoa.com/pharma/admin/userfiles/file/fapewifi.pdfIn PDF document text
    • https://urbanplace.me/wp-content/plugins/super-forms/uploads/php/files/e1d8b356164bde7401ed64d4d0869265/fidabekugatevumejoriri.pdfIn PDF document text
    • https://pluviaterra.mx/wp-content/plugins/super-forms/uploads/php/files/90f8198e9bb83e7a88fee09489ffd5e6/29477690526.pdfIn PDF document text
    • http://ar-intl.net/wp-content/plugins/super-forms/uploads/php/files/uv6ejjcm9mpbu9tg02mbf7as24/sivizilu.pdfIn PDF document text
    • http://maychamsocda.vn/images/userfiles/file/timigitemuvafen.pdfIn PDF document text
    • https://pabausa.org/wp-content/plugins/formcraft/file-upload/server/content/files/160772ef6745fb---konuvogazogalapegabifig.pdfIn PDF document text
    • http://www.holzbau-hoelzl.at/wp-content/plugins/formcraft/file-upload/server/content/files/160968c97e8431---nokedigufipediwase.pdfIn PDF document text
    • http://bukharajohnscreek.com/sites/default/files/file/wovinodetegusolajezi.pdfIn PDF document text
    • http://ophtalmic-overnight.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160710ad701039---68480056706.pdfIn PDF document text
    • http://barrybusiness-crm.com/ressource/devis-photo/files/20866734188.pdfIn PDF document text
    • https://www.brunosistemi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b963e3bdd3d---jigigonorawawi.pdfIn PDF document text
    • http://pebyte.com/wp-content/plugins/super-forms/uploads/php/files/qa8msmpu9hqlbd5g2av4ish813/88225954117.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=propiedades+fisicas+y+quimicas+del+acido+acetico+glacialPDF link annotation
    • 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_off0000ce09.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE09 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e61b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE61B 17860 bytes
SHA-256: b42a763f94112f8239c220a115de67d371ba15894e97ada8f04bbf6ab4da8364
font_02_sfnt_off00011337.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11337 11220 bytes
SHA-256: bbaebdd6d66c5a62c96811c44b606d56925c5e03b01379cb66bc54eadabc7de7