Malicious PDF — malware analysis report

Static analysis result for SHA-256 826b9c7a3b11e9bb…

MALICIOUS

PDF

79.5 KB Created: 2021-09-20 20:28:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 1a342b051001703b64314e141b1d4643 SHA-1: 13174e9c0eb582a058d397257e83ea579a8962b8 SHA-256: 826b9c7a3b11e9bb06f0dda09a0890f9a49cc94a726e94e17025f906a82d75b2
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised or disposable domains, indicating a link farm designed to lead users to malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution through these links. No scripts were extracted, but the structure and URL analysis are sufficient to determine the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://2018.letnifestiwal.pl/ckfinder/userfiles/files/ximupugoril.pdf In PDF document text
    • http://tubemakingmachine.com/uploadfile/files/vakunisesovadubudi.pdfIn PDF document text
    • https://www.ccps.mx/wp-content/plugins/super-forms/uploads/php/files/e5386ec76496422817db130e31ef8e53/menodolu.pdfIn PDF document text
    • http://donleroy.net/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/68682414061.pdfIn PDF document text
    • http://abcbyspu.net/ckfinder/images_store/files/jumosikilizebevumojed.pdfIn PDF document text
    • http://zaintik.org/files/galeria/files/vafivazim.pdfIn PDF document text
    • http://citty.org/images/uploads/file/tebupirikujive.pdfIn PDF document text
    • http://giftboxvietthuy.com/upload/ck/files/44763828653.pdfIn PDF document text
    • http://hlqh.net/userfiles/file/20210911174800_1587717672.pdfIn PDF document text
    • https://fitness-sport.it/userfiles/file/wafuno.pdfIn PDF document text
    • https://koltoztetes-szallitas-lomtalanitas.excore.hu/ckfinder/userfiles/files/ruwapemenasimo.pdfIn PDF document text
    • https://eclipsetheaters.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141bc5e7e237---62283073000.pdfIn PDF document text
    • https://www.kadeavenue.com/wp-content/plugins/super-forms/uploads/php/files/efa0c22c7bd5691fe0f328fda0f42e37/96264349696.pdfIn PDF document text
    • http://bawaconstructions.com/editorData/file/goxapok.pdfIn PDF document text
    • https://kluchar.net/klucharnet/images/file/lopitawurawopisa.pdfIn PDF document text
    • https://www.elementstraining.co.uk/wp-content/plugins/super-forms/uploads/php/files/30bra2ktdt0oltsqndq1eh0gs1/70493390598.pdfIn PDF document text
    • http://lohoithaiduong.com/uploads/files/fonufinupofabamudewuxoko.pdfIn PDF document text
    • http://vocal.bpv.su/content/files/files/4064573518.pdfIn PDF document text
    • https://kultmotor.hu/images/files/legorunagumajegovuw.pdfIn PDF document text
    • http://plusbateria.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b0c596eb95---91820806911.pdfIn PDF document text
    • http://zhjpharm.com/upload/files/wuzoduli.pdfIn PDF document text
    • https://gegeny.hu/uploads/file/84836428587.pdfIn PDF document text
    • http://autosklo.sk/pictures/file/43469400011.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=business+to+business+marketing+book+pdfPDF 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_off0000d54d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD54D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ed64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED64 11180 bytes
SHA-256: f9badf15a2a0908d5c3b0ed5f7a97d85115d6afc7fa635b82b0719b366a33227
font_02_sfnt_off0001072c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1072C 16124 bytes
SHA-256: 319a17e4d22f0db409be614a61c384109bb1b869f1ebc621afe791abe1039862

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