Malicious PDF — malware analysis report

Static analysis result for SHA-256 21e5fc61e38de1ad…

MALICIOUS

PDF

77.3 KB Created: 2021-08-03 06:50:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: e62daefaa9035d4f61738f8768000589 SHA-1: b2dd376b5d73e15de1a7fca00236984ebbe75846 SHA-256: 21e5fc61e38de1adde5b57eac5447ef98d523106e99f4820c9a5d84f85b758cd
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links, many pointing to compromised WordPress sites and other disposable hosting, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest this PDF is malicious, likely serving as a lure for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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://wastran.ru/uplcv?utm_term=bharat+mata+ki+jai+hd+wallpaper+download
    • https://dptech.vn/uploads/files/37684718224.pdf
    • https://pypconsultores.mx/userfiles/file/bonir.pdf
    • http://topopentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3f5495afc3---40757914862.pdf
    • https://aawyx.com/sites/default/imageuser/file/vedenog.pdf
    • https://njsolarpower.com/wp-content/plugins/super-forms/uploads/php/files/ba7c00f83352025b0084128f2c518bae/pozazat.pdf
    • http://www.risingstars.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160a0f7ceb688c---17719394887.pdf
    • http://www.hptindia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afd18331eee---59693482987.pdf
    • http://versobrokers.eu/userfiles/files/wusuzalujobetuv.pdf
    • https://wipaphun.com/UserFiles/File/78785109447.pdf
    • https://fjordancv.info/wp-content/plugins/super-forms/uploads/php/files/82462784c5b37fccaa11c47919dba631/gulagonebajaxolo.pdf
    • https://nolimitscenter.be/peausitive/images/FCKeditor/file/70945052094.pdf
    • http://desertofohio.net/clients/4/43/43f38f6e2239b09326489e1ba67fa1b6/File/22147623704.pdf
    • https://www.espymetcalf.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d8dd187f22f---39720697864.pdf
    • http://newbusan.net/FileData/ckfinder/files/20210628_5C601D2B6BBBFDB3.pdf
    • http://letsbelegal.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/vuwazirulexopeviw.pdf
    • https://arte-salon.ru/upload_picture/93976419376.pdf
    • http://hieuchuan.com/upload/files/zokekok.pdf
    • https://www.tctnanotech.com/wp-content/plugins/super-forms/uploads/php/files/42ecedc06acba994eee09757f7fa914e/79899483818.pdf
    • http://discarga.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078657795ac0---79231633839.pdf
    • https://uclerbaklava.com/resources/file/6578261658.pdf
    • http://endustriyelkiralama.com/wp-content/plugins/super-forms/uploads/php/files/pf4o5iqhuoua7ufb4vh8gfpisd/buzizuzewulumegavisopebej.pdf
    • http://www.redactordecontenidos.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160747b61ae61e---fajupojuruvukepobanan.pdf
    • https://fokusmedia.com/images/uploads/digexo.pdf
    • https://areshin.ru/wp-content/plugins/super-forms/uploads/php/files/14664cbfe750ca2c96e6a07638921498/serum.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cc6b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xCC6B 16792 bytes
font_01_sfnt_off0000e47d.bin
a0c1031df91eeef0fe3306644710f2935447cda83b63f81e285f38edcd03b2cd
pdf-font-stream PDF embedded font (sfnt) at offset 0xE47D 16160 bytes
font_02_sfnt_off00010e18.bin
9d42c31d1cb7959eddeb9c9c8299bd9f0ca2bfc3f41b5ded143a153c6b0451dc
pdf-font-stream PDF embedded font (sfnt) at offset 0x10E18 10852 bytes