Malicious PDF — malware analysis report

Static analysis result for SHA-256 a6f3a425c5ab2c9c…

MALICIOUS

PDF

89.8 KB Created: 2021-09-20 07:13:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: e5be11518c2b488f7703a7773af15df4 SHA-1: c5e5e2b21ea1d2faa4b44237cb25b068bd237b89 SHA-256: a6f3a425c5ab2c9c86abc2dc0e55a64f9854ae0a220b7b6d2208a423db603cd8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites used for hosting further PDF documents. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing second-stage malware. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, providing no direct user-facing content to analyze.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://crewmak.ru/uplcv?utm_term=why+is+my+keyboard+lagging+on+my+android PDF link annotation
    • https://rmissio.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1614007bb9acc5---fajesojubaratukobiwaxesu.pdfIn PDF document text
    • http://texmet.pl/userimages/file/2052473212.pdfIn PDF document text
    • http://ls12368.com/userfiles/file/mepafopibagan.pdfIn PDF document text
    • http://maskaevlawyer.ru/userfiles/file/88698590486.pdfIn PDF document text
    • https://grancom.by/upload/docs/votaj.pdfIn PDF document text
    • http://www.anapharmata.hu/ckfinder/core/connector/php/files/60445544321.pdfIn PDF document text
    • https://careerroots.net/ckfinder/userfiles/files/93898918935.pdfIn PDF document text
    • http://sp3siemianowice.pl/userFiles/files/21829410276.pdfIn PDF document text
    • https://alaskaproauto.net/nbloom/fckuploads/file/93281902874.pdfIn PDF document text
    • https://artcorner-fiberglass.com/userfiles/files/75835101625.pdfIn PDF document text
    • http://ghalemdi.com/userfiles/file/nexikorezel.pdfIn PDF document text
    • https://komunalno.vrgorac.hr/files/80834176092.pdfIn PDF document text
    • http://tgroupsrl.com/userfiles/files/44428576919.pdfIn PDF document text
    • http://bisenzia.it/userfiles/files/69346606695.pdfIn PDF document text
    • http://fueandhair.com/userfiles/files/35489517126.pdfIn PDF document text
    • http://nousgarage.com/userfiles/file/derimilowoxedamokofe.pdfIn PDF document text
    • http://damnoen.com/ckfinder/pho/files/31237206851.pdfIn PDF document text
    • https://studiopros.com/userfiles/file/In PDF document text
    • http://istanbulballoons.com/ckfinder/userfiles/files/xefimutemimorazoxi.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/161412ac5db787---talepi.pdfIn PDF document text
    • http://pentas.eu/userfiles/file/dataniserobinagomijisokuz.pdfIn PDF document text
    • http://bukhatirhomes.com/userfiles/file/zawudib.pdfIn PDF document text
    • http://www.festivalmarrakech.info/wp-content/plugins/formcraft/file-upload/server/content/files/16147a0af4c86b---nenosaredudupotakujaduk.pdfIn PDF document text
    • https://gulfcans.com/home/madarmun/public_html/gulfcans/images/bulk_images/files/67008368821.pdfIn PDF document text
    • http://ciaomamma.hu/editor_up/67349982293.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_off0000f87e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF87E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011095.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11095 10936 bytes
SHA-256: 2e8a2207256009ae0b86fb0f2b0a6405747cb464152d2a252c0416d65584f6d7
font_02_sfnt_off0001297e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1297E 18340 bytes
SHA-256: 87b71ec60e8e1615489585420c191a88a9db98b2dde77526d93b2f80236bc7ac

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