Malicious PDF — malware analysis report

Static analysis result for SHA-256 50727eb236075ce4…

MALICIOUS

PDF

88.6 KB Created: 2021-09-05 19:32:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 1739630fa550789ec3914b261b1ebb5e SHA-1: 98ad1c36222b6a614569866126a7b3c1c8c54d35 SHA-256: 50727eb236075ce4fc24470826c721d6c7b86a864cbc4a060110bbfe56b8bbd9
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1055.012 Process Injection T1204.002 Malicious Link

The PDF document contains numerous links, many hosted on compromised WordPress sites, which likely serve as a link farm to obscure the ultimate destination. The ML classifier and ClamAV detection strongly indicate malicious intent, with the document likely being a phishing lure or a distribution point for further malware. The presence of multiple distinct hosts and URLs suggests an effort to evade detection and distribute malicious content broadly.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 7

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://queure.ru/uplcv?utm_term=abdominal+pain+differential+diagnosis+pdf PDF link annotation
    • http://www.skupp.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160a7c4df126d4---buwerovosawapavolatomu.pdfIn PDF document text
    • https://thejinglelab.com/wp-content/plugins/super-forms/uploads/php/files/724a44n8oci9mcpk660b96sie3/20001099212.pdfIn PDF document text
    • https://directprocessors.com/wp-content/plugins/formcraft/file-upload/server/content/files/160baccc1ec076---gojedijezisuzujogeka.pdfIn PDF document text
    • http://mitsubishilongbien.vn/images/ckeditor/files/57452474094.pdfIn PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/4u08oudkfgnm5iq3ubfahj4ivb/11070840230.pdfIn PDF document text
    • http://spoilersmensgolfclub.com/clients/865201/File/10849516021.pdfIn PDF document text
    • http://nhs1966reunion.com/clients/1/1c/1ca8f1639ee69cd7806809ed3bcda9bb/File/9092266218.pdfIn PDF document text
    • http://paradisetourkorea.com/FileData/ckfinder/files/20210702_3C9CE3A7F91F14E3.pdfIn PDF document text
    • https://zzhqhi.com/d/files/74431746497.pdfIn PDF document text
    • http://cansuyu.org/resimler/files/wukilekeninexizepopavuf.pdfIn PDF document text
    • http://kup-vino.cz/web/ckfinder/userfiles/files/nekomikokifa.pdfIn PDF document text
    • http://derma-dts.de/files/file/21375476032.pdfIn PDF document text
    • http://www.amedna.com/userfiles/files/lomepu.pdfIn PDF document text
    • http://futurepoolandspa.com/ckfinder/userfiles/files/31826502164.pdfIn PDF document text
    • http://sumtinathholidays.com/admin/uploadfiles/file/bizipukivat.pdfIn PDF document text
    • https://arihantgranites.in/wp-content/plugins/super-forms/uploads/php/files/27l4sr0j06cfenoir53vmq1ie4/62311602574.pdfIn PDF document text
    • https://www.rockfallco.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072c0014fadf---tazomeso.pdfIn PDF document text
    • http://kaplanpm.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abdf22aa506---40757157408.pdfIn PDF document text
    • https://salvatoredivilio.it/userfiles/file/62512370177.pdfIn PDF document text
    • http://freemansphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608226f5314ba---wulekazexapopukexaro.pdfIn PDF document text
    • https://udruga-invalida.hr/files/tikirimat.pdfIn PDF document text
    • http://jcon-aps.dk/userfiles/file/54823883891.pdfIn PDF document text
    • http://xatrbio.com/userfiles/file/xasex.pdfIn PDF document text
    • http://www.kmclogistics.com/wp-content/plugins/super-forms/uploads/php/files/b3a8e48dfd570fbec204214952765976/kofuxirivuj.pdfIn PDF document text
    • http://anhuifan.com/upload_fck/file/2021-5-14/20210514081349556942.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_off0000f758.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF758 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010f6a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F6A 17248 bytes
SHA-256: 6e23c14bf4ecb2dda061886f8cf0e9a5c8a9936e4536e63ffaa3523590a08d6b
font_02_sfnt_off00013bb5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13BB5 10964 bytes
SHA-256: 823af7fd1721e046d36aae6794b226c94db4ab4027add57ab9365598c5bbe10c

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