Malicious PDF — malware analysis report

Static analysis result for SHA-256 28d3da4a2b8b9bc2…

MALICIOUS

PDF

90.9 KB Created: 2021-07-25 17:19:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 10a457edc6bce6af22505ac75fa48f98 SHA-1: 5869ab2679c0c591fdccef4b685a9f15dcdf14e8 SHA-256: 28d3da4a2b8b9bc2bb84428058a55e2cf3acdd44d9bc309596bd449ffde79eab
164 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and numerous external links, many pointing to compromised WordPress sites or disposable hosting, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The embedded JavaScript likely facilitates the redirection to malicious URLs or the download of further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://whs1963.com/clients/7/75/758a827d59fb1c2827eec60421ffdc22/File/degewulujudamet.pdf
    • http://www.nanodrywash.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079514dc20dc---65526795424.pdf
    • http://www.morenoroofing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2c785564c0---mufowevutarudo.pdf
    • https://indiantalentjunction.com/milan/media/raxivefomasomovegigujoga.pdf
    • http://orchid-daikanyama.com/userfiles/file/konidudonuxen.pdf
    • https://hssanesteban.cl/files/vipisebeka.pdf
    • https://comesa.com.pe/wp-content/plugins/super-forms/uploads/php/files/tchadm1nraqlm4pc9n1jm5qnb4/viwemipasike.pdf
    • http://pmdrecycling.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f010b9400c---1415334873.pdf
    • http://www.naturapreserved.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608461a76d5c2---xevotikujebekoguxogojepix.pdf
    • http://punaide.com/userfiles/files/12769920750.pdf
    • https://www.lipfish.no/wp-content/plugins/formcraft/file-upload/server/content/files/16086af4a9b2c9---70612844461.pdf
    • http://xn--80akij1ajew.xn--p1ai/wp-content/plugins/formcraft/file-upload/server/content/files/1608558460dc2d---25241170970.pdf
    • https://pensiuneavlasin.ro/wp-content/plugins/super-forms/uploads/php/files/se1n3f3vleqr2qb3djld99mr5u/zanotekure.pdf
    • https://gmonlinestore.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607164b4094f4---74656145992.pdf
    • https://247christianity.org/fckeditor/userfiles/file/wexubirusijivupen1622282170.pdf
    • http://slp72.com/clients/7/7b/7b902bee17765b19ebdde6030f24742d/File/waxasiladoxisezodukoriw.pdf
    • https://miamiuniquelimo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607128c4a8fa2---48218030702.pdf
    • https://gofropack.com/wp-content/plugins/super-forms/uploads/php/files/c171a1c4eae87a037079b3c122ad1029/67492579184.pdf
    • https://transpack-krumbach.de/_upload_bilder/_filemanager/file/64525416376.pdf
    • https://imad0c0.com/js/ckfinder/userfiles/files/52768485508.pdf
    • http://cambridgekapurthala.com/damana/userfiles/file/fujawifuponoxosex.pdf
    • https://www.brunosistemi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a49e156a050---devalanovalaga.pdf
    • https://solucionaesp.com/ckfinder/userfiles/files/85179404351.pdf
    • http://oneself.pro/wp-content/plugins/formcraft/file-upload/server/content/files/160f20eb16e1fd---37126733548.pdf
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/hvhkmubbcbih8lut73pf1okfv2/donasojajerutituza.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=due+diligence+report+format+pdf
    • 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_off00010009.bin
040c8bd16029f978f95e67ce40979e7b0b6cac5c56ba13b2a3585e7b5d39ec26		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10009 17240 bytes
font_01_sfnt_off00012cbf.bin
217480fc19abc3bc746198c0f285c876ae64d2a9baa0556767cbc9a269c620f9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12CBF 10896 bytes
font_02_sfnt_off000145b2.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x145B2 16792 bytes

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