Malicious PDF — malware analysis report

Static analysis result for SHA-256 dda8823ce631cf1b…

MALICIOUS

PDF

101.0 KB Created: 2021-09-06 20:00:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 8f3311da43fdf0e25b32dda7366ad7da SHA-1: d2701fc3689b7b658cc2a14e1ea30d9dc5d1882c SHA-256: dda8823ce631cf1bccd5cc12c625037cafb5cc4fc7927461ecf59b4d58ea0743
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links pointing to compromised WordPress uploads and disposable hosting, suggesting it functions as a link farm to distribute malicious content or phish users. The PDF structure and embedded URLs are consistent with a spearphishing attachment used to redirect victims to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/ef36071843e4a4ac2378ccc9e997a57a/35463772807.pdf In PDF document text
    • http://abwingssuffolk1.com/uploads/files/28549506712.pdfIn PDF document text
    • http://mnogonomerov.ru/uploads/file/dadegagedaxirawid.pdfIn PDF document text
    • http://suseefinance.com/userfiles/file/98465419966.pdfIn PDF document text
    • http://southportrubbish.com/wp-content/plugins/formcraft/file-upload/server/content/files/160969cd213f4f---xakojesajozuxafefopu.pdfIn PDF document text
    • https://ecoolteh.eu/galeria/file/58825005850.pdfIn PDF document text
    • http://biosite.ru/images/news/file/tidozurisefavowobewojaw.pdfIn PDF document text
    • https://retentionstudentexperience.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f0ef8a876f---joselewapad.pdfIn PDF document text
    • http://atrsara.ir/resource/files/fulezexilemarorubamika.pdfIn PDF document text
    • http://taiyoaquris.cn/upload/userfiles/files/20210801204648.pdfIn PDF document text
    • https://habibitoursegypt.com/ckfinder/userfiles/files/66721190326.pdfIn PDF document text
    • http://broadviewlibrary.org/uploaded_bvlib/file/pasedevaromesorefirove.pdfIn PDF document text
    • http://centromp.it/userfiles/files/xadejasi.pdfIn PDF document text
    • http://conganbacgiang.vn/app/webroot/uploads/files/24102057025.pdfIn PDF document text
    • http://www.lauricedale.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1609d52e5b9cd0---kujusumuxubukugozas.pdfIn PDF document text
    • http://anatolianlgs.com/userfiles/file/74080287339.pdfIn PDF document text
    • https://cdmsig1.com/ckfinder/userfiles/files/torogekukowazowularopep.pdfIn PDF document text
    • http://anaminfo.com/attachfile/file/19385689593.pdfIn PDF document text
    • http://fxmeat.com/upload/file/65ac8f377d0a5e21ce2f9654a74069fb.pdfIn PDF document text
    • http://phongkhamthienhoa.org/images/files/gobobokudumipuw.pdfIn PDF document text
    • https://kvgrup.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/16092b34366838---39969669145.pdfIn PDF document text
    • https://hopefor.today/wp-content/plugins/super-forms/uploads/php/files/166eaedb9e16991b5fdbe3c5e263d4f5/zeximikinulo.pdfIn PDF document text
    • https://kayakbranson.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089f67d06002---28022238211.pdfIn PDF document text
    • https://www.couleurs-et-jardin.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160c4da30ef2bb---38385426041.pdfIn PDF document text
    • https://12shio2.com/contents/files/38834804714.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=2012+nissan+sentra+factory+service+manualPDF 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_off000122fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122FC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00013b0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B0E 19068 bytes
SHA-256: 9a47f5f1c852d81fd9127944b93e4f1f712ba0747b225c2388336c6a5453a33b
font_02_sfnt_off00016c77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16C77 10976 bytes
SHA-256: d7cc2b38c230def87c028ff91b6e71b349cc7d56c6652ce7506fbc24a3467a0c

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