Malicious PDF — malware analysis report

Static analysis result for SHA-256 40cb7bdaba672d5e…

MALICIOUS

PDF

72.6 KB Created: 2021-09-28 14:55:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 736d3bbbadecf89caa36cb585d2220db SHA-1: 56932030257dbfedd4d3fbfdd30f453fd92a31b9 SHA-256: 40cb7bdaba672d5e9a4ada5611363c69e3e433bdf1fb69f5d31191ec05765fe3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many hosted on compromised or disposable domains, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and link farm behavior are consistent with techniques used to deliver second-stage payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9967

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://anabakorea.jp/userfiles/file/dugevumexi.pdf In PDF document text
    • https://www.edutechusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614034898c7d6---24654806874.pdfIn PDF document text
    • https://xulynuocphangiathinh.vn/images/pic/file/tefutevewujizimijajikumi.pdfIn PDF document text
    • https://sonntag-immobilien.lu/userfiles/files/89996758655.pdfIn PDF document text
    • http://carlaschroyen.com/content_docs/26293595992.pdfIn PDF document text
    • http://naturallabs.de/userfiles/file/jijusixuni.pdfIn PDF document text
    • http://sethhukumchandschool.com/userfiles/file/52157410256.pdfIn PDF document text
    • http://aczelzalog.hu/tmp/4127760717.pdfIn PDF document text
    • http://cetinelektrik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1613e22a9e065f---kifasotutivuvasanagiv.pdfIn PDF document text
    • http://testplanet.nl/uploads/files/puwirejibagixebij.pdfIn PDF document text
    • https://its-bulgaria.bg/files/file/zemojemifikidudorileje.pdfIn PDF document text
    • http://rovitek.com/userfiles/file/jakek.pdfIn PDF document text
    • http://paykaaluminiya.ru/ckfinder/userfiles/files/gejovet.pdfIn PDF document text
    • http://gzky.cn/dubeite/ckfinder/userfiles/files/20210922_031528.pdfIn PDF document text
    • https://edukiya.com/wp-content/plugins/super-forms/uploads/php/files/fd07caacccb16284696c9f1c425d4d5a/29219090734.pdfIn PDF document text
    • http://bangladeshceramicsociety.com/uploads/editor/files/55317082944.pdfIn PDF document text
    • https://alexandrapanayotou.com/web/images/static/file/lekipekuba.pdfIn PDF document text
    • https://cicimanis.com/contents/files/26466655510.pdfIn PDF document text
    • http://tomekorea.com/userData/board/file/42972341784.pdfIn PDF document text
    • http://jawarakreasi.com/file/wotuwixo.pdfIn PDF document text
    • http://structurecreative.com/wp-content/plugins/formcraft/file-upload/server/content/files/161492d3d77f70---20354957797.pdfIn PDF document text
    • https://thanaclusterwestgate.leaddeehub.com/userfiles/files/towuk.pdfIn PDF document text
    • https://ncfouting.com/wp-content/plugins/formcraft/file-upload/server/content/files/161500ba6be5b3---41549398672.pdfIn PDF document text
    • http://re-media.ru/foto/ck/files/pufofegezovifulumidake.pdfIn PDF document text
    • https://petala.gr/userfiles/file/50736832679.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=xlsx+file+to+pdf+converter+free+downloadPDF 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_off0000b54f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB54F 18024 bytes
SHA-256: 88bdb1b44e2bb96fa339b7b6b9a1395e20e83db6000da2632697d8ef58e8b71b
font_01_sfnt_off0000e34d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE34D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fb64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB64 10872 bytes
SHA-256: adc97df76b543fb920cb2d7169a5cca9a34ce1c36fb44259b63ef12add7d0a06

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