Malicious PDF — malware analysis report

Static analysis result for SHA-256 997c6c9a3d010c8a…

MALICIOUS

PDF

73.2 KB Created: 2021-06-27 13:23:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: c843699b3783953974eb53091882badd SHA-1: aead684f610332347bda15ecc584436efd4aafbd SHA-256: 997c6c9a3d010c8ae5895ce2169c22c43017e93121ea9d647ebd3fffe837cb55
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links, many pointing to compromised WordPress upload directories, suggesting an attempt to distribute further malicious content or phish users. The document body is heavily obfuscated and unreadable, providing no direct user-facing lure.

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 http://grandchainfamilyfoundation.org/clients/85333/File/serulobe.pdf
    • https://flylights.pl/wp-content/plugins/super-forms/uploads/php/files/017e8oo3l04mub08n63gagce1l/bejegaku.pdf
    • http://www.brennholz-heinlein.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b28c03baae6---16579558603.pdf
    • https://pypconsultores.mx/userfiles/file/voxasugomokaka.pdf
    • https://foreningenflex.se/anvandarbilder/173/files/gedalotuximizosimuvabux.pdf
    • https://leicht-spb.ru/wp-content/plugins/super-forms/uploads/php/files/d5a16d4714defca618849794af542782/biluz.pdf
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/rnk12e524nhooaoni5bihipha6/zugade.pdf
    • http://willtorock.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c0fc4900edd---mofomib.pdf
    • http://www.altrus.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160aa67699b3c3---29595775251.pdf
    • https://stratasphere.online/userfiles/file/74701253410.pdf
    • https://q-web.ro/wp-content/plugins/super-forms/uploads/php/files/8vl465cf4de6mi031er1m0tg38/bonalejivomuxi.pdf
    • https://controlcert.se/wp-content/plugins/formcraft/file-upload/server/content/files/1607b095545ad1---nixunirobefibuzap.pdf
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/hi47m9a3vh8smvsrk1qrolrbo0/6262593996.pdf
    • https://www.mercato.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160bbbc059f37d---56904121062.pdf
    • http://www.gaviprintpack.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d28eeab5b06---64470497189.pdf
    • https://dialogueinpraxis.net/files/docs/rivapu.pdf
    • https://ladychief.com/wp-content/plugins/super-forms/uploads/php/files/4e61c05f142c6d694b21fb5b03051cf8/18063740653.pdf
    • http://www.marcelasemper.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081eb9f10188---31211578697.pdf
    • https://arizonapoolcontractor.com/wp-content/plugins/formcraft/file-upload/server/content/files/160906653d7182---fusugasid.pdf
    • https://www.cukoyem.com.tr/wp-content/plugins/super-forms/uploads/php/files/hkj8v0n2u3d6c9ct75f9m3d321/fedamepivaxilu.pdf
    • https://travelstore.tn/userfiles/file/55414244296.pdf
    • http://c2ctrading.org/cms_upload/files/85475540288.pdf
    • http://www.viksexteriors.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082475849a08---tamujijatugazuzalizami.pdf
    • https://airbays.com/userfiles/file/pozovasasusip.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=piecewise+linear+functions+worksheet+answers
    • 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_off0000bb2a.bin
eaeeae9db631b70b1222efae6a48232f9fc6c227ab8927c62dc6bf7c610afc8c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBB2A 16776 bytes
font_01_sfnt_off0000e6cd.bin
3e880ac105953e6008f455f45a54d4a578791342c78fb6b1f480db2acf98b51a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE6CD 10712 bytes
font_02_sfnt_off0000ff71.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFF71 16792 bytes

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