Malicious PDF — malware analysis report

Static analysis result for SHA-256 16fc5b47f272ff20…

MALICIOUS

PDF

82.4 KB Created: 2021-09-17 22:14:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 6867cee267a439b186d4b15a93220dd9 SHA-1: bb0750e3fab46be63cfd65a56785c4fbd0b1531a SHA-256: 16fc5b47f272ff20de0e2f9c09d82f880b3a4c7682a390788942c3564bcd223d
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable domains, indicating a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware delivery. The document body is heavily obfuscated and unreadable, providing no direct clues to its purpose beyond what the heuristics reveal.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9946

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 http://www.luna1956.com/images/library/File/12448291076.pdf In PDF document text
    • http://www.cuadernos.in/wp-content/plugins/formcraft/file-upload/server/content/files/16137a468c3089---xalamonofimatogadubudi.pdfIn PDF document text
    • http://bwemfjhjk.friend-match.com/upload/files/95871469708.pdfIn PDF document text
    • http://hkacca.com/userfiles/dolonidomokenedu.pdfIn PDF document text
    • https://tapetcenter.ro/app/webroot/files/userfiles/files/80961823677.pdfIn PDF document text
    • https://sandipkumardutta.com/ckfinder/userfiles/files/45843454331.pdfIn PDF document text
    • http://dailynewsodia.com/assets/ckfinder/core/connector/php/uploads/files/63976887558.pdfIn PDF document text
    • http://neoclassicalmansions.com/uplds/file/goribir.pdfIn PDF document text
    • http://safeabortionnepal.com/userfiles/file/xunekefo.pdfIn PDF document text
    • http://vasset.bg/userfiles/file/lurusomegonugegokuzuj.pdfIn PDF document text
    • https://cauthinh.com/luutru/files/48279504356.pdfIn PDF document text
    • http://test-immo.com/file/lagawasorabifo.pdfIn PDF document text
    • https://web-sila.ru/wp-content/plugins/super-forms/uploads/php/files/0cef71568da562ba6e1dd4be3a5fa78c/17653249049.pdfIn PDF document text
    • http://www.rpv-drachten.nl/files/file/wipemobi.pdfIn PDF document text
    • https://stefandes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a27fe9aff2---gowewofuxaxokemi.pdfIn PDF document text
    • https://ipekyolumedya.com/resim_galeri/file/44886380391.pdfIn PDF document text
    • http://bbhshipyard.com/userfiles/file/timatejidamaralutuzux.pdfIn PDF document text
    • https://cargotavio.ru/files/file/povoxizaxopawuregenoleb.pdfIn PDF document text
    • https://zegaoyun.com/calisma2/files/uploads/nedubemapagajawisiledura.pdfIn PDF document text
    • http://standardamulet.com/files/files/xakeraroxuridufipegat.pdfIn PDF document text
    • https://goldenparadisestsimons.com/wp-content/plugins/super-forms/uploads/php/files/a23dd73b18cf4931fc1865a90b1decef/sotupujuxuf.pdfIn PDF document text
    • http://gccde.com/downloads/blog/geust/files/zemejinubovapevogonu.pdfIn PDF document text
    • http://automsystem.com/UploadFile/file/20210905232606177.pdfIn PDF document text
    • http://candybeauty.vn/upload/files/54110275455.pdfIn PDF document text
    • http://ms-beauty.com/ckfinder/userfiles/files/lajobovotisaxowavifow.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=android+g%C3%BCvenlik+sertifikas%C4%B1+sorunuPDF 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_off0000d765.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD765 20024 bytes
SHA-256: 90fe5d34a4f6db78aabe46e4c4f729fc464c4780a222b4a36a0d9ea8b019f5f0
font_01_sfnt_off000108cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108CB 11008 bytes
SHA-256: cd9e0eb137e417e43f3b94ec0a5f3a7edbe030d6c522c5f6b1845efc29019a46
font_02_sfnt_off000121fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121FC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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