Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc327a61f372829c…

MALICIOUS

PDF

94.6 KB Created: 2021-07-18 20:57:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: f6a62d342ac843fabe5ae345bc729a7f SHA-1: 75236a4574185cba6d8ff48de13b5c7f14997894 SHA-256: bc327a61f372829cb6b698a8a3db1b6f5f20c42b2ad5939dcbbcb4f5021e1ddd
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm, with many URLs pointing to compromised CMS uploads and disposable hosting, indicating a phishing or SEO manipulation attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to redirect users to malicious sites or download further payloads. No scripts were extracted, but the structure and URL patterns are indicative of a phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://ludifrance.fr/userfiles/file/refosulazujeborazafom.pdf
    • https://www.accidentinjuryalbuquerque.com/wp-content/plugins/super-forms/uploads/php/files/ao3s58nvvko63nf7k73t3vf96p/foriruwanowakedirabufer.pdf
    • http://lapawan15.com/shop/fck_file/file/mowod.pdf
    • https://thieumaunao.vn/workspace/develop/uploads/ck_upload/files/melosidakofevu.pdf
    • https://binhvi.com/upload/files/bigoxokubopimiwos.pdf
    • https://ytdrive.com/CKEdit/upload/files/xaboxijiviferinuvojurafim.pdf
    • http://europeanprofservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073ca3ed5bb8---26414151745.pdf
    • http://drvision.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607ddb872e326---13860695210.pdf
    • http://bestbelly.org/content/files/files/72336473017.pdf
    • https://www.colegiodesafio.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/160dce92d9c17b---54019969735.pdf
    • https://www.icslights.com/wp-content/plugins/super-forms/uploads/php/files/3150b13d104a955b42fa5dfc7aecc02e/44662505080.pdf
    • http://cuacuontoanthang.com/media/file/tiseluligarakusir.pdf
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/638c516e2305d377ba7d975eca89b27c/40786654907.pdf
    • http://nw-line.ru/generic/uploaded/bafofuwefafabalatafoda.pdf
    • http://www.expo-hotel.com/english/wp-content/plugins/formcraft/file-upload/server/content/files/1607ac04d956db---97989966823.pdf
    • https://www.anandtirth.com/wp-content/plugins/super-forms/uploads/php/files/5adefvmg7ncfsns31ii0bi7bc6/seretigu.pdf
    • http://innobiztour.com/FileData/ckfinder/files/20210622_DE1073120C9776E6.pdf
    • https://udachi.co.th/wp-content/plugins/super-forms/uploads/php/files/d4p6bljgbeld2qek8341celqh2/88636595061.pdf
    • http://www.chinahkcarplate.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bfd60d169a2---30115706596.pdf
    • http://conelser.hu/fck_uploads/file/42748322181.pdf
    • http://accessprecision.com/userfiles/file/vidifij.pdf
    • https://expresstestingatl.com/wp-content/plugins/super-forms/uploads/php/files/9d30a460ee59f4824d394517f8560f2d/56684599324.pdf
    • http://hnatiukreunion.com/clients/b/b5/b5561851e3069b632e798ef7a1275556/File/46535901208.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=how+many+styles+of+music+are+there
    • 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_off00010e97.bin
7067e2fca77a7da2f61bd6eca698bb0971bcd713ebc4a9182703cc98ce3128f5
pdf-font-stream PDF embedded font (sfnt) at offset 0x10E97 17408 bytes
font_01_sfnt_off00013c34.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13C34 16792 bytes
font_02_sfnt_off0001544b.bin
5ab4ed5cfbaf67b2d4e2e90f34ff8d17ddd01c2cf5407ad6d192e0771496911e
pdf-font-stream PDF embedded font (sfnt) at offset 0x1544B 10892 bytes