Malicious PDF — malware analysis report

Static analysis result for SHA-256 b3459a9a0f44c898…

MALICIOUS

PDF

79.2 KB Created: 2021-09-05 12:26:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: ca7edb9d5165f7a78aa9ee74f996dd2d SHA-1: 01339707e99f8cce78b99b3a37e7d44f55ff7446 SHA-256: b3459a9a0f44c89815927e318b1f55a496d5480d74db56fb5d3aa44a81013f7f
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 websites 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.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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 http://emailreceptionist.net/userfiles/file/gipidadobawuzunu.pdf In PDF document text
    • http://rinsacars.com/files/others/16772565185.pdfIn PDF document text
    • http://zuestag.ch/userfiles/files/rawinubon.pdfIn PDF document text
    • http://www.zopfitravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cce495ca4d---35051338391.pdfIn PDF document text
    • http://vibrosystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607397d06771b---viravo.pdfIn PDF document text
    • https://tierrettung-in-katalonien.org/ckfinder/userfiles/files/98274999421.pdfIn PDF document text
    • http://cricalliance.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075a68060118---16520935207.pdfIn PDF document text
    • https://www.chablis-gautherin.com/ckfinder/userfiles/files/sakovureberetuviv.pdfIn PDF document text
    • https://estoniapools.com/contents//files/mavadupakifitozute.pdfIn PDF document text
    • http://ccsctda.com/ckfinder/userfiles/files/20210726_120908.pdfIn PDF document text
    • https://www.frankreich-ferien.ch/wp-content/plugins/formcraft/file-upload/server/content/files/16099f7d0b1f99---raxotalexekavadalorivoxok.pdfIn PDF document text
    • http://www.yevres.fr/ckfinder/userfiles/files/wirufilejuzoxadob.pdfIn PDF document text
    • http://actlogistic.vn/upload/editor/files/jezenewalotamizevi.pdfIn PDF document text
    • https://jjmassociates.com/wp-content/plugins/super-forms/uploads/php/files/227d18fbcb09e72c69c92d56c456fb57/suvujiv.pdfIn PDF document text
    • http://studiogaleazzo.eu/userfiles/files/45125762891.pdfIn PDF document text
    • https://advik.net/userfiles/file/20597950795.pdfIn PDF document text
    • http://xn--12cfu9bc1efac9a9azfdsb7b9d1f0j.net/ckfinder/userfiles/files/bejujuxizaj.pdfIn PDF document text
    • https://zemiigori.com/uploads/file/nabirituruwen.pdfIn PDF document text
    • http://littlepearlbooks.in/data/eimages/file/lidemenego.pdfIn PDF document text
    • https://riverasphotovideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ed71bdf2d4---zizukilutemetotediba.pdfIn PDF document text
    • http://sochi-vitrazhi.ru/ckfinder/userfiles/files/55566992460.pdfIn PDF document text
    • http://basse-normandie.annuaire-regional.com/ckfinder/userfiles/files/7197774664.pdfIn PDF document text
    • http://skkouty.cz/ckfinder/userfiles/files/pijisifavomibubafonelil.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=rutaceae+family+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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d26e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD26E 17312 bytes
SHA-256: 11c95b5964ebf56dd17c81ad11f2ba97a0a1b5ab434ba6862d0e5ff2bac3e9ae
font_01_sfnt_off0000ff1f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF1F 10548 bytes
SHA-256: d97579b183ae84a48305462e24b1ea39bf5e986c98e7da68bd9e6e22cfd42918
font_02_sfnt_off00011737.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11737 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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