Malicious PDF — malware analysis report

Static analysis result for SHA-256 657bc08f3eed4163…

MALICIOUS

PDF

76.3 KB Created: 2021-09-08 11:36:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 132ba9d6682cd09bb55f7caa19d68673 SHA-1: cb68ddf951ecd0cf2f7ed749200744c033734a3e SHA-256: 657bc08f3eed416343a082c9da28a585cf65533e7967ae559e4f0d34fb7e9852
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous URLs pointing to compromised WordPress sites and other disposable hosting. These links are likely used to redirect users to phishing pages or download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://cructi.ru/uplcv?utm_term=yatharth+geeta+marathi+pdf PDF link annotation
    • https://lee-trading.tw/archive/upload/files/29823409104.pdfIn PDF document text
    • https://best-turbos.com/wp-content/plugins/super-forms/uploads/php/files/a6c62db2359e6d0c90b9047164649a8b/xofebuxapesozanomem.pdfIn PDF document text
    • http://topas.lt/userfiles/file/sulejisuxe.pdfIn PDF document text
    • http://www.jcca.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/160b2acfe2eb4f---80990277613.pdfIn PDF document text
    • https://vashadvokat82.ru/wp-content/plugins/super-forms/uploads/php/files/1793ec3e2f434824ab3444b15c1474bc/loxanotugabex.pdfIn PDF document text
    • https://www.ezhealthcheck.com/wp-content/plugins/super-forms/uploads/php/files/4nht62j96st46b8e61r41kcc3a/82121770036.pdfIn PDF document text
    • https://tirthmobile.com/wp-content/plugins/super-forms/uploads/php/files/ohke1fhtoi6a0k21arb71r1q5t/wisatazuwepopopa.pdfIn PDF document text
    • http://www.agrosystem.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160a8faa106810---wolowovunodadujegowutuvox.pdfIn PDF document text
    • https://mytopics.it/uploads/file/pifuwakesap.pdfIn PDF document text
    • https://canadiancontractorservices.com/wp-content/plugins/super-forms/uploads/php/files/ksp7f0r1dcajkg188ku3gdm480/49922178399.pdfIn PDF document text
    • http://seventyfirstclassof69.com/clients/60772/File/razifevamizipozawetoluw.pdfIn PDF document text
    • http://flirdining.com/uploads/files/gokugadijer.pdfIn PDF document text
    • http://longthinhphat.net/uploads/files/kaxakazafapivaxesijovev.pdfIn PDF document text
    • http://aleeblog.com/wp-content/plugins/super-forms/uploads/php/files/sjgrlt3momgghpp6k6779msls0/lulumefiwetaxasigunoju.pdfIn PDF document text
    • http://goref.ru/files/file/61763940503.pdfIn PDF document text
    • https://118highschool.am/wp-content/plugins/super-forms/uploads/php/files/92035bb6d38859335d465dfe8961bbe9/40528518289.pdfIn PDF document text
    • http://ahjygjg.com/upload_fck/file/2021-8-31/20210831162043341619.pdfIn PDF document text
    • https://lawina-radom.pl/files/file/mosikesoniwinuvelisiwi.pdfIn PDF document text
    • http://www.grundys.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16119d33c069c1---33966237385.pdfIn PDF document text
    • http://www.benvenutialmare.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b43ad9cdfd2---jevaximobekevowini.pdfIn PDF document text
    • http://dotbamboo.com/file_media/file_image/file/81912121765.pdfIn PDF document text
    • https://www.almuhja.com/ckfinder/userfiles/files/bibemobidil.pdfIn PDF document text
    • http://richmediahouse.com/admin/uploads/file/fagawiteza.pdfIn PDF document text
    • http://www.schule.havonix.com/ckfinder/userfiles/files/40187393010.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c4f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC4F6 10492 bytes
SHA-256: f68a60a1c663005184d3837d1c9d37fd9a060400b9fcd02c97d416d7ff5c2f1b
font_01_sfnt_off0000dc92.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC92 17772 bytes
SHA-256: 8c5fc87f85c555b6d2d64a4a7cee1553d938d326f5aa8b15b23bdcf4272beaf0
font_02_sfnt_off00010b63.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B63 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1