Malicious PDF — malware analysis report

Static analysis result for SHA-256 55e27f4634f58f98…

MALICIOUS

PDF

72.0 KB Created: 2021-09-12 21:44:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: a80492a62049856f96605837709463d0 SHA-1: 48ed9c2d077c3cdf451d8828da98ed3c7773bb95 SHA-256: 55e27f4634f58f98f2610619cf3fb579301d5a6e6e6f7b8b1da73e31333a0297
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, flagging it as a phishing trojan. It contains numerous links, many pointing to compromised or disposable domains, suggesting a link farm designed to lure users to malicious sites. The document body is heavily obfuscated and does not provide direct textual clues, but the heuristic firings strongly indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://assushop.com/userfiles/assushop.com/file/zekejebakarikadu.pdf In PDF document text
    • https://congthuonghotel.vn/app/webroot/files/images/pages/files/26171987271.pdfIn PDF document text
    • http://burmeseburmilla-allevamento.com/userfiles/files/wovigodoxuwevino.pdfIn PDF document text
    • http://parilka.by/var/upload/file/27346233940.pdfIn PDF document text
    • http://www.thediethub.in/wp-content/plugins/formcraft/file-upload/server/content/files/161358c0a14b3c---16771950996.pdfIn PDF document text
    • https://franchisefarm.franchiseharbor.com/files/files/30461887280.pdfIn PDF document text
    • http://myagreement.com/UserFiles/file/lifarojodopumu.pdfIn PDF document text
    • https://maydongy.com/wp-content/plugins/super-forms/uploads/php/files/2a9q8378hu4n6q3d1u84c8vru6/95772399635.pdfIn PDF document text
    • http://urbanposthotel.com/admin/ckfinder/userfiles/files/julawugemufosobikebofir.pdfIn PDF document text
    • https://bulendengin.com/upload/ckfinder/files/siwogopasin.pdfIn PDF document text
    • http://awfiowv.love-mrt.com/upload/files/78502011869.pdfIn PDF document text
    • http://pwmtqatar.net/userfiles/file/gimajezewuxemodefesinuv.pdfIn PDF document text
    • http://geerhannutpourreussir.be/docs/upload/files/lizafonaxivesoxiw.pdfIn PDF document text
    • https://xn--80aesyq.xn--p1ai/files/file/37584676874.pdfIn PDF document text
    • https://arendic.cl/files/larupobavewadibef.pdfIn PDF document text
    • https://bentzendesign.se/wp-content/plugins/formcraft/file-upload/server/content/files/1613d0e0e03a9d---kijinugigaxarenidoze.pdfIn PDF document text
    • https://infotechloyalty.com/bot/ckfinder/uf/files/9955537478.pdfIn PDF document text
    • http://wsp.pl/userfiles/file/kupamujowefizaz.pdfIn PDF document text
    • https://rentcar888.com/uploads/files/202109100943554890.pdfIn PDF document text
    • http://leap-egypt.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ba0abe4c25---sufigerefo.pdfIn PDF document text
    • https://verticala.ro/images/userfiles/fujexuxobibipe.pdfIn PDF document text
    • http://boxethai38.com/upload/file/metuzuxoneredamilikoni.pdfIn PDF document text
    • http://www.ponderosafestival.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613502c855792---fesuwidomima.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=algebra+and+calculus+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_off0000b8a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB8A9 15864 bytes
SHA-256: 65a4b41bb93f7f7007a10884dfafbe605f70b22ece4d795ff707a4609f935e83
font_01_sfnt_off0000e15a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE15A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f971.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF971 10920 bytes
SHA-256: 360c4c802b8396735eba0a839d353f8fc64ba43626cdbb810d23e6d9f6e902dc

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