Malicious PDF — malware analysis report

Static analysis result for SHA-256 bfae4c846e678434…

MALICIOUS

PDF

87.0 KB Created: 2021-07-01 22:34:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: cf5283a46bb5b342983931ac15b5cd87 SHA-1: 91c9243dcd8e8d95f9fc8fe579100d9d9368643b SHA-256: bfae4c846e678434d2affae23e535138a07fa30fbce4c1f472e4bc2f8aaeb7ef
156 Risk Score

Malware Insights

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

The PDF contains a large number of links, many pointing to compromised WordPress sites or disposable hosting, indicating a link farm designed to distribute malicious content or phish users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware delivery via embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://augsburger-dartliga.de/uploads/file/zoxifejuxi.pdf
    • https://www.lavishlook.se/wp-content/plugins/super-forms/uploads/php/files/e87ee7719b748564e121556247ad1853/gasezoxi.pdf
    • http://safarang.com/basefile/files/bawibulekisipenilo.pdf
    • http://moveisgarciadigital.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160844cf7d21ad---rezitujaw.pdf
    • https://journeypeople.cc/wp-content/plugins/super-forms/uploads/php/files/0c4bb47a8a32ff8b2dbe03b0998578b4/dosirigajetodonakotupijig.pdf
    • http://www.colegiometa.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/160b420be2cfc2---68681249975.pdf
    • https://k-kompany.ru/wp-content/plugins/super-forms/uploads/php/files/145280420e82e37992e018aa62411f97/49597509615.pdf
    • https://sg-design.top/wp-content/plugins/super-forms/uploads/php/files/64856f05a841ea8e4780873f686f97cf/44687753019.pdf
    • https://118highschool.am/wp-content/plugins/super-forms/uploads/php/files/386dbeb87babdb38873af9318f7a77c0/pisesu.pdf
    • http://erkerlaender.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ab539cac475---74952645531.pdf
    • https://nobleanimalsanctuary.org/wp-content/plugins/super-forms/uploads/php/files/tmp/55241427451.pdf
    • https://autosofortkauf.ch/wp-content/plugins/super-forms/uploads/php/files/9i1rbin0e5mcldk7eajggl3125/12854524801.pdf
    • http://www.iamgoingto1996.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ac0985ed68---51914433445.pdf
    • http://quiltingacademy.com/fckeditor/userfiles/file/8524031289.pdf
    • http://personnelstrategies.net/userfiles/file/nolunepodofena.pdf
    • http://graphicon.hu/wp-content/plugins/formcraft/file-upload/server/content/files/160cf1714a8588---12394685330.pdf
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/v8sj9k767m8vmmfjnmheblj0m3/jidozuvidugotatetogi.pdf
    • https://topclassgreenery.nl/images/file/bapesalamexubul.pdf
    • https://mandalaconfeccao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160af504ecd3f3---mavej.pdf
    • http://xn--l3cbpp3gh4a5g5c.com/userfiles/files/palikamigilek.pdf
    • http://broadviewlibrary.org/uploaded_bvlib/file/rirepademizanamexivavula.pdf
    • http://naasschoolofmotoring.com/fckeditor/userfiles/file/bifinaxamenini.pdf
    • https://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d0750e0b85---luxisaloborobo.pdf
    • https://shared401k.com/wp-content/plugins/super-forms/uploads/php/files/c4614cdc3af1447ba0bdb34ba9bc50b2/dojipopedubebuzezagar.pdf
    • http://admio.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16086c7e5ccd58---57857145204.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=manual+means+stick+shift
    • 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_off0000f230.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF230 16792 bytes
font_01_sfnt_off00010a47.bin
ff16f59e1263b818d8b98dc5787ce82e2e038e7501a90a8741857cb054ec0dd8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10A47 10568 bytes
font_02_sfnt_off00012226.bin
1f4750b500cd3d85db0e4db696a7575717b6b5e5bbd610ac568f2f7c47e77b89		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12226 17144 bytes

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