Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc22f01593d73675…

MALICIOUS

PDF

80.2 KB Created: 2021-09-06 07:24:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 710d40595ed110576e19f0bb2cbb8e72 SHA-1: f3dd327fdb3a34699ac8b5eddf61083e5f39a28c SHA-256: bc22f01593d7367596e44c306b66a7354612ca55434f74f27fb586702760c8b8
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload storage or disposable hosting, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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=aerodynamics+for+engineering+students+solution+manual+pdf PDF link annotation
    • https://mfdesign.hu/files/file/33404113095.pdfIn PDF document text
    • http://hmed.vn/upload/files/pidafaxadobazosa.pdfIn PDF document text
    • https://maloneslandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/16121b0219b9c1---zubirodewere.pdfIn PDF document text
    • http://kmkonsult.cz/userfiles/file/29865288378.pdfIn PDF document text
    • http://veterinariacomportamentale.it/userfiles/files/zupapawatedadub.pdfIn PDF document text
    • http://formpart.com/upload/ckfinder/files/34270205790.pdfIn PDF document text
    • http://mariamozharova.ru/uploads/files/74564452414.pdfIn PDF document text
    • https://millinerandassoc.com/files/file/33370085629.pdfIn PDF document text
    • https://erinmillssmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/eqkqstoai1t5maa7hbnaedivm5/wegiwokajokenosaxaxuk.pdfIn PDF document text
    • http://www.recetasyconsejos.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609066a377762---80282590424.pdfIn PDF document text
    • https://www.amiunaorchestra.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160adcd698e156---46484216931.pdfIn PDF document text
    • http://clubselectionvoyages.net/images/file/vabugokoderewomunuvil.pdfIn PDF document text
    • https://canadiancontractorservices.com/wp-content/plugins/super-forms/uploads/php/files/v6o3hcc59e78pj1rivh49nrjv1/19198231005.pdfIn PDF document text
    • http://www.dadosefatos.net.br/wp-content/plugins/formcraft/file-upload/server/content/files/160f246e19a101---nuvarinazasag.pdfIn PDF document text
    • http://atrsara.ir/resource/files/pezomijidajomubodizikos.pdfIn PDF document text
    • https://admonks.ru/wp-content/plugins/super-forms/uploads/php/files/29e733f68dd06e7553d03f2e96c3bc30/23946893624.pdfIn PDF document text
    • https://landbondcorten.com/attachment/file/52ad66397188c30e0b3444ba74f04b89.pdfIn PDF document text
    • https://rijst.nu/userfiles/file/76683256396.pdfIn PDF document text
    • https://1sis.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b96184991b8---tufowu.pdfIn PDF document text
    • https://robinio.de/wp-content/plugins/super-forms/uploads/php/files/r4mj3cr2gn14hesenns1sm30hk/9952874701.pdfIn PDF document text
    • http://www.whirlpool-beachcomber.at/wp-content/plugins/formcraft/file-upload/server/content/files/161002461200bf---wuvajuwagepe.pdfIn PDF document text
    • http://ntep2008.com/UserFiles/File/48549309577.pdfIn PDF document text
    • https://vpmemorial.net/images/file/7470099837.pdfIn PDF document text
    • https://adtw1.com/ckfinder/userfiles/files/10979021746.pdfIn PDF document text
    • https://funbugs.ie/files/file/42624784028.pdfIn PDF document text
    • https://textosolutionslinguistiques.ca/upload/editor/file/17677026293.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_off0000cf85.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF85 18540 bytes
SHA-256: 0949b9a215d9f9fd7e78da6072a9fa5234637a63a8332b562f0fdb1e48070eac
font_01_sfnt_off00010058.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10058 11160 bytes
SHA-256: e9469f0337b102e1c1ede54d0714213bc01a403b92040f1fb1e7fb6adb061b18
font_02_sfnt_off00011a48.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A48 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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