Malicious PDF — malware analysis report

Static analysis result for SHA-256 9d3c987562ef27c5…

MALICIOUS

PDF

95.7 KB Created: 2021-09-04 20:56:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 3c4c9b238eef275dd454ac940550ce3f SHA-1: d56f4f0e0b1d05a512f551f265b1cbc6f8f7aeff SHA-256: 9d3c987562ef27c5835f9d72c14f0b7c4b071c2331d14b48c1c3d7090047da58
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to compromised or disposable hosting, indicative of a link farm designed to lead users to malicious sites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery. No scripts were extracted, but the structure itself is the attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9941

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 https://hanakspotrebice.cz/eshop/ckfinder/userfiles/files/93275688990.pdf In PDF document text
    • http://abapaposentados.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160f86d82eec4d---lolun.pdfIn PDF document text
    • http://blog.crowdly.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a32207f505---wurebazado.pdfIn PDF document text
    • https://arbormaster.net/uploads/files/fexujur.pdfIn PDF document text
    • http://smn1970.com/clients/d/d4/d44d2684521ac238e4bdef02d06179b0/File/65866081710.pdfIn PDF document text
    • http://akkoryazilim.com/userfiles/file/kekikonow.pdfIn PDF document text
    • https://keralahappyjourney.com/ckfinder/userfiles/files/75599031534.pdfIn PDF document text
    • http://centralcogtc.com/uploads/file/91558716346.pdfIn PDF document text
    • http://rubivina.com/Images_upload/files/gojob.pdfIn PDF document text
    • http://colantuono.it/userfiles/files/zetuwanemogarozenilul.pdfIn PDF document text
    • http://congtrinhnhaviet.vn/upload/files/14546866049.pdfIn PDF document text
    • http://www.mvdisposal.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a25e71dc36a---82981348387.pdfIn PDF document text
    • https://kingdom.vn/userfiles/file/31998867595.pdfIn PDF document text
    • http://grimastone.ru/files/66182878621.pdfIn PDF document text
    • http://akcjonariusz.com/UserFiles/file/sizejewakuv.pdfIn PDF document text
    • http://flirdining.com/uploads/files/jizoxexif.pdfIn PDF document text
    • https://doellefjelde-mussemarked.dk/images/newsmail/file/26822704164.pdfIn PDF document text
    • https://asigurareingermania.ro/wp-content/plugins/super-forms/uploads/php/files/j13c9ir9aqu26glkqer4tpj0eq/77491531896.pdfIn PDF document text
    • http://livestreaming.group/wp-content/plugins/super-forms/uploads/php/files/sr9mktvubng21o459rkdqe35v9nq6lfc/gabakipix.pdfIn PDF document text
    • http://udmvdpo.ru/images/files/6857536813.pdfIn PDF document text
    • https://neavocats.com/wp-content/plugins/super-forms/uploads/php/files/bc03e6227e666fd85bd02a9ad16bcd98/32438469101.pdfIn PDF document text
    • https://stillwaiting.org/userfiles/file/kudetev.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=%D8%AA%D8%AD%D9%85%D9%8A%D9%84+%D9%83%D8%AA%D8%A8+%D8%B3%D9%85%D9%8A%D8%B1%D8%A9+%D9%84%D9%84%D8%B7%D8%A8%D8%AE+%D9%85%D8%AC%D8%A7%D9%86%D8%A7+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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off00010c9e.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x10C9E 26316 bytes
SHA-256: 604156726d6e36ae29d9ea33676cc6ce31895bc5ee458728c4f503d055cdeb22
font_00_sfnt_off0000d855.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD855 20792 bytes
SHA-256: 6f466a9c42a449a74633d1dee6c61fe335ec134cbbf6306c71d343f90113fd97
font_02_sfnt_off00013b91.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B91 9372 bytes
SHA-256: ab692011bb810b4091e5b6863c1468cc19624005727076e0e42723678ec61724
font_03_sfnt_off00014f74.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14F74 19116 bytes
SHA-256: 2e4c9a77cc84a9835669dfb0015dad39c2b5b74f3685a9f623b57becb1dc16d0

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