Malicious PDF — malware analysis report

Static analysis result for SHA-256 2036b2867bdcc148…

MALICIOUS

PDF

86.3 KB Created: 2021-09-05 07:38:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 16920e096cf2464ee5199b7ec6fe864f SHA-1: 1eeb060c8862dfe5fbe40e760143d9841382b2c0 SHA-256: 2036b2867bdcc1489ecd49a88670a28edf884b5f88ce02fb5b382821ad3020fa
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The 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 pointing to compromised CMS uploads and disposable hosting, suggesting a phishing or malware distribution scheme. The presence of embedded URLs and the nature of the heuristics point towards an attempt to redirect users to malicious sites, likely as part of a spearphishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • LOLBin token sequence in document text high SE_LOLBIN_RUN_COMMAND
    Extracted document text contains a Windows script/execution tool name (PowerShell, mshta, cmd, rundll32, regsvr32, …) within 220 characters of a dangerous flag, command verb, or URL. This is a visible 'run this' instruction in HTML/PDF/RTF lure bodies, or — in macro-laden Office files — the macro's own string-pool entries appearing adjacent in extracted text.
  • 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://onthebroadway.com/CPD/adminpanel/upload/file/vowudapaxexus.pdf In PDF document text
    • https://isosklo.cz/uploads/boxuxugajamuvup.pdfIn PDF document text
    • https://minegociomiweb.com/userfiles/file/dunubivavaris.pdfIn PDF document text
    • https://baoholaodong24.com/userfiles/file/93380937273.pdfIn PDF document text
    • https://newat.ru/wp-content/plugins/super-forms/uploads/php/files/3cca620b8e5aad3591720aa21cb8a417/diguxesokikif.pdfIn PDF document text
    • http://www.segurosfacility.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16129dd2838242---45391468518.pdfIn PDF document text
    • http://kindervakantieweekdeurne.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607327cc367e8---zevujapi.pdfIn PDF document text
    • http://ascensionchina.com/userfiles/file/wobezodurivubujutopefij.pdfIn PDF document text
    • http://jumpstart.mobi/ckfinder/userfiles/files/72458604848.pdfIn PDF document text
    • http://sad-azov.ru/wp-content/plugins/super-forms/uploads/php/files/9d4f88b5e20a7a31d835ce1bde1abf78/80420611554.pdfIn PDF document text
    • http://pixel-pro.ru/upload/file/35826511587.pdfIn PDF document text
    • http://polymer-optix.de/userfiles/file/sijekodufadavidasesemiw.pdfIn PDF document text
    • http://osteriailgalloelinnamorata.com/userfiles/files/30267817797.pdfIn PDF document text
    • http://dokumsuzgec.com/userfiles/files/94940672512.pdfIn PDF document text
    • http://charmingcurls.se/upload/file/wosawowebiv.pdfIn PDF document text
    • http://hrzservices.com/uploadfiles/file/85047454015.pdfIn PDF document text
    • https://cwlighting.com/wp-content/plugins/super-forms/uploads/php/files/036fc81f055c92ff05bc263a11bb136d/41788487737.pdfIn macro / runtime command snippet
    • https://www.fifatravels.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd0d4a4a00f---rewogirurizukit.pdfIn PDF document text
    • http://andreevmag.com/wp-content/plugins/super-forms/uploads/php/files/765ae6c599846d046bea4abd5549ff75/98424795216.pdfIn PDF document text
    • http://dalnoboy.org/data/filestorage/upload/files/nujodoxerid.pdfIn PDF document text
    • https://www.entornopublicitario.com/wp-content/plugins/super-forms/uploads/php/files/d9010627f6d939403820552ac5352b8f/rixawegatadopujifasakekur.pdfIn PDF document text
    • http://crocepadrekolbe.it/userfiles/files/1323830971.pdfIn PDF document text
    • https://tsafar.ir/basefile/tsafarir/files/61063263443.pdfIn PDF document text
    • http://www.argentum.com/wp-content/plugins/super-forms/uploads/php/files/0jqrc57bldvb45lrngsrttalre/dalatutudaramuwunogelof.pdfIn PDF document text
    • http://hrzservices.com/In macro / runtime command snippet
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=binomial+distribution+pdf+and+cdfPDF 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_off0000e52b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE52B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fd3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD3D 20076 bytes
SHA-256: 5bb46c368b5894e5e1d5fa9d8fa2cf76c7e3b050ca9d770fb12ac332a633a8dd
font_02_sfnt_off00013218.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13218 10944 bytes
SHA-256: 8c1b4775c95b6713bd8ba5e6f1e31693dafd23f3b3bbad582fa0bdf9f4cd0804

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