Malicious PDF — malware analysis report

Static analysis result for SHA-256 084f9850adfc0b70…

MALICIOUS

PDF

84.4 KB Created: 2021-09-15 17:24:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 4a0351cfc4e09d1a493fa6016fa15d05 SHA-1: aba70149813933c2bf87e490124a00da3759c847 SHA-256: 084f9850adfc0b703077e05333e5c2467b0aa64b79fc5bd72bd6e248683a7547
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs that form a link farm, pointing to compromised CMS uploads and disposable hosting, suggesting a phishing or malware distribution scheme. The presence of these links and the overall structure align with techniques used to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://huntic.ru/uplcv?utm_term=smartphone+under+10000+bd PDF link annotation
    • https://thic.muki001.com/plugin/ce1/ckfinder/userfiles/files/35953700263.pdfIn PDF document text
    • https://mandalaconfeccao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613cc53090817---41440370659.pdfIn PDF document text
    • http://hk-bbc.com/upload/file/tavodenijawixaxas.pdfIn PDF document text
    • http://artkulinaria.pl/sites/default/files/file/masewekibewejowatazi.pdfIn PDF document text
    • https://goldenparadisestsimons.com/wp-content/plugins/super-forms/uploads/php/files/8509a92361d3bda7f29e3670f8a1cc5a/28002630016.pdfIn PDF document text
    • http://dataprint.ie/uploads/file/jupusojuwuninoxigif.pdfIn PDF document text
    • https://5uempat.com/contents/files/88906365939.pdfIn PDF document text
    • http://cn-biyoute.com/d/files/derufozuj.pdfIn PDF document text
    • http://www.lircai.com/web/inline/file/xufeki.pdfIn PDF document text
    • http://chetaomaynganhnhua.com/uploads/files/zefitolugabasonuji.pdfIn PDF document text
    • http://planet-for-events.de/userfiles/file/bosaka.pdfIn PDF document text
    • https://albertscience.com/ckfinder/userfiles/files/dibidavelubudugi.pdfIn PDF document text
    • https://siyata.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1614022fa2aec9---78978223978.pdfIn PDF document text
    • http://jocoseatee.com/userfiles/files/97379903894.pdfIn PDF document text
    • http://boldino-hotel.com/ckfinder/userfiles/files/57363832346.pdfIn PDF document text
    • http://ylphs.com/ckfinder/userfiles/files/17425034435.pdfIn PDF document text
    • https://deesudcoolingtower.com/userfiles/file/zolekatitasazubalarorewe.pdfIn PDF document text
    • http://alt-1c.ru/userfiles/file/fatobojavixozi.pdfIn PDF document text
    • http://app0.linkeo.it/ckfinder/userfiles/files/rowozizabifajenexadujimo.pdfIn PDF document text
    • https://cristiandellavedova.com/wp-content/plugins/super-forms/uploads/php/files/6fbee0fc897a5bd6836e74db2400a854/tokojixasibafatepexexomin.pdfIn PDF document text
    • http://deaprogettazioni.it/userfiles/files/8746149571.pdfIn PDF document text
    • http://bertrandetgastineaudesigners.fr/userfiles/file/buguxop.pdfIn PDF document text
    • https://treasurehunterdetectors.solar-ovens.net/ckfinder/userfiles/files/borogujamakodemorotemuru.pdfIn PDF document text
    • http://professional-tuner.at/uploaded/file/69763213681.pdfIn PDF document text
    • http://bbpcosmetics.com/admin/upFiles/2021-9/file/11663845847.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_off0000e2fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2FA 18596 bytes
SHA-256: 1459ce149fa0f973a079136a54d4005ed5dfce160d8bb13a01791f7f2f9e9839
font_01_sfnt_off00011388.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11388 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012b9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B9F 10840 bytes
SHA-256: 55c5491338814d3f4287d985d65d305d3347d40c42599c97659b1ff11bfc972e