Malicious PDF — malware analysis report

Static analysis result for SHA-256 840c5a3155a6644e…

MALICIOUS

PDF

90.7 KB Created: 2021-07-15 14:14:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: ecded761ae8232d3ad8cffac0acab158 SHA-1: a5f4d9b4436e650884f9e03380c091a7325f5fbc SHA-256: 840c5a3155a6644effbb2d47724c8b1c00da627bbd50f0cc5c539222da1ac49c
156 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple compromised websites and potentially disposable hosting domains. The embedded URLs and the nature of the heuristics strongly suggest an attempt to distribute malicious content or phish for credentials.

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://clubforeducation.com/FCKeditor/userfiles/file/38701097365.pdf
    • https://braviengenharia.com.br/wp-content/plugins/super-forms/uploads/php/files/srsr4dfbi0jff441rchltpgob7/30382651887.pdf
    • http://ecole.ru/text/images/file/gonagebizude.pdf
    • https://edoxmarketing.com/wp-content/plugins/super-forms/uploads/php/files/s6000llbon9gv92rgsou5t3526/vevepugusobakunirinaje.pdf
    • https://imapcb.org/wp-content/plugins/super-forms/uploads/php/files/ncq9nv2gfu6h3a9djkqimqkvk0/75391461265.pdf
    • http://www.rlktechniek.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160bff3ca1131a---nelak.pdf
    • https://www.nestroots.com/wp-content/plugins/super-forms/uploads/php/files/hk8vkbjadu9nmero1gdceq5qh2/silisulodotuje.pdf
    • http://drvision.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608ee6bfacb01---fafapoxefonibesoduxaroju.pdf
    • https://www.kadinlarsitesi.org/wp-content/plugins/formcraft/file-upload/server/content/files/16081fa8169e25---51052921592.pdf
    • https://webmodels.studio/wp-content/plugins/formcraft/file-upload/server/content/files/1607e7ca5c692c---duxidepikesugefuk.pdf
    • https://protechlighting.com/wp-content/plugins/super-forms/uploads/php/files/0e52f6638e9af430c8fcdb9164649513/barol.pdf
    • http://sowitech.vn/upload/files/xufowebeditusemelupetu.pdf
    • http://originalcheck.it/public/img_admin/file///vadufe.pdf
    • http://antik-cafe-bergen.de/wp-content/plugins/formcraft/file-upload/server/content/files/16071108458a7f---40201609579.pdf
    • https://www.medipratik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609eda20224d7---januditevokebubuxopelivug.pdf
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607f1bb07ed4c---gutewalivopup.pdf
    • http://steps4cancer.org/clients/a/a7/a78c374070a178914b502abaf3db82b8/File/pidoxifexibinafulir.pdf
    • http://festivaldeliteraturadepereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a23ced350ee---dadejisefebabuxukilaf.pdf
    • https://www.opdrrustukalac.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094e1c0a3438---topikalip.pdf
    • https://www.tifdip.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b655972d740---vuzizovatavenixako.pdf
    • http://www.multigacos.com/admin/uploaded/fck/file/mulupaxojelobenukulid.pdf
    • http://xn--80aikni6a0b.xn--p1ai/images/file/49021457345.pdf
    • https://electroagro.es/pub/files/86559742743.pdf
    • https://amatnieks.com/pictures/image/sarigipulegug.pdf
    • https://www.sabiamente.es/wp-content/plugins/formcraft/file-upload/server/content/files/16087120695a6f---safugukajuveseporavumap.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=colossus+meaning+in+english
    • 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_off0000f854.bin
4123d160aa6955fca47e9c1dc55588cc5968316dca9ba2970a12682e8e5e439a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF854 20680 bytes
font_01_sfnt_off00012db4.bin
89f3a59c548aa18b9e0dede9f4d21c6f287b12f37c87b9cde8d1433a1ea84f3e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12DB4 10488 bytes
font_02_sfnt_off00014558.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14558 16792 bytes

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