Malicious PDF — malware analysis report

Static analysis result for SHA-256 79c44cc0875b9170…

MALICIOUS

PDF

75.5 KB Created: 2021-09-08 12:59:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 4ce4bd0da028d671431cebaa1f56a3ae SHA-1: 82e13d80fc571227763850bdc8c4b049424c7cf7 SHA-256: 79c44cc0875b91708e8f4e01be8fb77f6a7f8f9cfda29ae3dec82fb6266e7111
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to distribute malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://queure.ru/uplcv?utm_term=mekanisme+metabolisme+karbohidrat+pdf PDF link annotation
    • http://arsvet.ru/img/upload/betikujawixugaxom.pdfIn PDF document text
    • http://www.gulbaharsigorta.com/contentData/file/7233771746.pdfIn PDF document text
    • https://cambodiadriverservice.com/userfiles/file/gudogexifoxufelubi.pdfIn PDF document text
    • http://outspokenholland.com/userfiles/fckFile/20210902104503.pdfIn PDF document text
    • https://francois-daulte.com/ckfinder/userfiles/files/pojabak.pdfIn PDF document text
    • http://www.majoriscambio.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16137e06e243ce---87076070055.pdfIn PDF document text
    • https://resttour.com/images/userfiles/files/28475365398.pdfIn PDF document text
    • http://xedaptheduc.net/app/webroot/uploads/files/30490014198.pdfIn PDF document text
    • https://netcsemege.elelmiszer-hazhozszallitas.hu/ckfinder/userfiles/files/tilosev.pdfIn PDF document text
    • http://aodaibooking.com/FileData/ckfinder/files/20210907_780E350C0786885C.pdfIn PDF document text
    • https://uzunlarpeynir.com/dursun/upload/files/susadinixebelovexafidida.pdfIn PDF document text
    • http://hurtowniagrafit.pl/userfiles/file/6292017507.pdfIn PDF document text
    • http://kxxbs.com/uploadfiles/file/a/kifaleruxinojekelonazi.pdfIn PDF document text
    • http://unipell.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16134817816bbe---pagopuriveduxigotaju.pdfIn PDF document text
    • http://www.leasebridge.com/CKUPimg/files/49302082618.pdfIn PDF document text
    • https://www.esfa.bg/root/ckfinder/userfiles/files/34687493677.pdfIn PDF document text
    • https://ncsccalgary.com/userfiles/files/mamojixudutel.pdfIn PDF document text
    • https://propactionvehiclesuk.tv/userfiles/files/92815356462.pdfIn PDF document text
    • https://parvazyab.com/basefile/api203/files/34155710938.pdfIn PDF document text
    • https://amthanhanhsangchinhhang.vn/upload/files/15418184590.pdfIn PDF document text
    • http://obrienbuilders.com/userfiles/file/fezitojo.pdfIn PDF document text
    • http://boletin.alicantehosteleria.com/lib/ckfinder/userfiles/files/pajipokoposedara.pdfIn PDF document text
    • https://liur-krd.ru/userfiles/file/62266271773.pdfIn PDF document text
    • https://loctra.net/userfiles/file/gogaxamogowuledefalar.pdfIn PDF document text
    • http://schouteninterieurwerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16136d4d5a7f07---41326030967.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_off0000c379.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC379 10988 bytes
SHA-256: 7b140914c257db3680bb52bd0a42ab344aa9ba2627433bfb4ed30f22a14b7d3e
font_01_sfnt_off0000dc8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC8C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f49e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF49E 17088 bytes
SHA-256: 2a08c2ff9e8ced99c25a00d21892b49f9a5596a4aa002385b820de4a7b5c6f98

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