Malicious PDF — malware analysis report

Static analysis result for SHA-256 bbd66e7f45139837…

MALICIOUS

PDF

88.3 KB Created: 2021-07-09 01:48:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 8e05ca85b2f67420f4c78a8f9cdfce68 SHA-1: fbdc9a6a05e3d84ec330e95189762b444eca84b8 SHA-256: bbd66e7f45139837712ae8896ec6563519a1b5b13830cd1feed8849447291f93
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, embedding numerous URLs that point to compromised WordPress upload directories and disposable hosting. The primary purpose appears to be directing users to malicious sites for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://wastran.ru/uplcv?utm_term=potd+aetherpool+requirements PDF link annotation
    • http://ne-moloko.ee/wp-content/plugins/super-forms/uploads/php/files/bba79880bf6d8f712c4478478711a127/43309836635.pdfIn PDF document text
    • http://hollywoodterrace.org/clients/863344/File/22974201571.pdfIn PDF document text
    • https://www.getfitcrew.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abce53ca172---fiwizoliradulutol.pdfIn PDF document text
    • http://www.hangmandigital.com/files/file/kisalibijoxepududirira.pdfIn PDF document text
    • https://estoniapools.com/contents//files/dogupaku.pdfIn PDF document text
    • http://www.chinahkcarplate.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d04c414c30---baduritosofumugogovumanuf.pdfIn PDF document text
    • http://www.ddd-iasi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160c216a3a1889---41461701497.pdfIn PDF document text
    • https://www.traveltimevipp.com/wp-content/plugins/super-forms/uploads/php/files/9dcd05ec56c135bdcc415c2e48f26e63/96955904456.pdfIn PDF document text
    • https://balarampurblock.in/ckfinder/userfiles/files/rutinizasolekap.pdfIn PDF document text
    • http://woonhuislift.info/wp-content/plugins/formcraft/file-upload/server/content/files/1609b2a46d20a1---42132093639.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c84c0a303b7---fusudufotivuzikimoremopug.pdfIn PDF document text
    • http://www.virtualaid.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1606f1f064ca64---vutorikizovorowemu.pdfIn PDF document text
    • https://chocoinmobiliario.com/wp-content/plugins/super-forms/uploads/php/files/fd1747743d4f7004afc563a8894d3ee8/wuxiriteluj.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/tizitotigifirebar.pdfIn PDF document text
    • http://gulfcoolcontracting.com/uploads/userfiles/file/file/59373835983.pdfIn PDF document text
    • http://soundreaming.org/wp-content/plugins/super-forms/uploads/php/files/2f43c02466e9a403554ae5185b548bf6/51105607480.pdfIn PDF document text
    • https://www.tonygssoulfood.com/wp-content/plugins/super-forms/uploads/php/files/69922a6f11b71c818f0565e620c15d8e/remamojizadeposexa.pdfIn PDF document text
    • https://www.criteriainvest.com.br/wp-content/plugins/super-forms/uploads/php/files/pgdsternqe92uf838bs4gfhopc/rukuwalewivobotet.pdfIn PDF document text
    • http://zavalinka.by/var/upload/file/levon.pdfIn PDF document text
    • http://mobydick-band.de/fckdata/file/1097840699.pdfIn PDF document text
    • https://lightupalife.org.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b798b53ad77---3940197903.pdfIn PDF document text
    • https://floridaholidayplanner.com/wp-content/plugins/super-forms/uploads/php/files/3b2a6eaff7f395e66de66e5aa3708c35/24004069765.pdfIn PDF document text
    • https://plswa.com/wp-content/plugins/super-forms/uploads/php/files/ac5ba0d8c0d9ed52799b6921a97a6838/vixivutixapi.pdfIn PDF document text
    • https://sharpspringwww.kinsta.cloud/wp-content/plugins/super-forms/uploads/php/files/93a02b5b3bd40faf747248cb5e57127d/kereselat.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_off0000f4f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4F8 10904 bytes
SHA-256: 60a5925e2844ad06b38f6d7f7ea78ae7c3a4de3a07174ba42aead06a0061284e
font_01_sfnt_off00010dc4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DC4 16968 bytes
SHA-256: 0d7bdc5e517c797d1ff274cafbbbcdd3b5a4999f5944e9febaf78feb7606f8af
font_02_sfnt_off00013a14.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A14 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1