Malicious PDF — malware analysis report

Static analysis result for SHA-256 03a408269d39d747…

MALICIOUS

PDF

82.8 KB Created: 2021-08-06 20:12:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 22b255eb88f24da1b29a49588ab58c40 SHA-1: f6c450b22324c98bbe60962ad8c7f5cb22996147 SHA-256: 03a408269d39d7471380e22474af0acdf2eddfd3c0d3440d441df3393701e585
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by ML classifiers and ClamAV as malicious, indicating it likely contains malicious content. The heuristics reveal it functions as a link farm, hosting numerous PDF files on potentially compromised or disposable domains. While no scripts were extracted, the structure and numerous external links suggest it's designed to redirect users to malicious sites or for SEO spam.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://congtydaihai.com/upload/files/fatobuviwojasadobajomotef.pdf In PDF document text
    • https://csom.cz/wp-content/plugins/super-forms/uploads/php/files/352140d135614fadde9155177fdfa19c/wosakosorafokoj.pdfIn PDF document text
    • http://glenbrooksouth1970.com/clients/1/17/17fc1bd13d5538a69f39d58c869d2fc5/File/tolamagolirirakafevotiga.pdfIn PDF document text
    • https://cmottaviproductive.it/uploads/file/10087177803.pdfIn PDF document text
    • https://sjamsul-hidajat.id/ck_uploads/uploads/files/wapafizujufopetexadinunen.pdfIn PDF document text
    • http://vivaibonomo.it/userfiles/files/50248743923.pdfIn PDF document text
    • http://scherzerpc.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/50283963247.pdfIn PDF document text
    • http://adria-ex.com/images/blog//file/11076587454.pdfIn PDF document text
    • https://deconkhoemanh.com/wp-content/plugins/super-forms/uploads/php/files/2rai18oq9ijpdcvrm5cbtv55vv/juponavejunuzigetemubeges.pdfIn PDF document text
    • http://www.thebetterinsurance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b26b0a30f81---pefetojizexuz.pdfIn PDF document text
    • https://www.okcfarmersmarket.com/wp-content/plugins/super-forms/uploads/php/files/1900e3667b977eb104fa65a26a39886b/73615584632.pdfIn PDF document text
    • http://niezapominajkowo.eu/userfiles/file/70764603666.pdfIn PDF document text
    • http://mirrorgallery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608cd15863859---fabibopowejukoxo.pdfIn PDF document text
    • http://sinara.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160feab7ab5a02---jejanuzarefoxule.pdfIn PDF document text
    • http://akinmedikal.com/uploads/file/39228689459.pdfIn PDF document text
    • http://gestaocipa.com/public_html/Imagens/file/30256350177.pdfIn PDF document text
    • https://borderpak.com/wp-content/plugins/super-forms/uploads/php/files/6ad04904803d1defbdbd449bf2f1498c/vilevatufometafa.pdfIn PDF document text
    • https://suhrsmad.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160ec4ba069992---luwozimonuwadat.pdfIn PDF document text
    • http://arkystudio.eu/userfiles/files/lajakib.pdfIn PDF document text
    • http://aeskulap24h.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607bab43d2fe7---zugakatijojikegonido.pdfIn PDF document text
    • http://kimhoatra.vn/upload/fckimagesfile/52503145265.pdfIn PDF document text
    • https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/0b7bc7f5e13af81ddb85561bdcd4b30b/1743793079.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=how+to+solve+improper+mixed+fractionsPDF 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_off0000dd53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD53 17340 bytes
SHA-256: f1827578547f9e1363bc32c2fdb111472743cc1c21ea1d03072c256285249ea3
font_01_sfnt_off00010a99.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A99 11028 bytes
SHA-256: 3123350e0e2e47b9aed23d92cdf3419878a428b670af18f04103c57336e0583a
font_02_sfnt_off00012441.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12441 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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