Malicious PDF — malware analysis report

Static analysis result for SHA-256 5167e940abcdbb1b…

MALICIOUS

PDF

73.9 KB Created: 2021-08-11 04:46:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 306007b0d71061ec1f97c2599bbf0372 SHA-1: f9164fd7623a7ac440d8aee57a7243797ecf90ff SHA-256: 5167e940abcdbb1ba0573a5cdfc153fae52a96d30832640f86a2fccd5e7bab85
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file identified as malicious by ML classifiers and ClamAV. It contains numerous links pointing to compromised websites, suggesting a phishing or malware distribution campaign. The PDF structure and embedded links indicate an attempt to redirect users to potentially harmful content, aligning with a spearphishing attachment attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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://archism.ru/uplcv?utm_term=are+jeans+from+boohoo+good
    • http://shmountaineering.co.uk/wp-content/plugins/super-forms/uploads/php/files/ia0uvoloem7ppfobtabfk3c193/27048296497.pdf
    • https://cryptoshift.be/anaeter_capital/siteadmin/userfiles/files/59840796736.pdf
    • https://viticoltura-enologia.com/file/24984395147.pdf
    • http://consulcongress.it/uploads/assets/file/zixilufeker.pdf
    • http://henri-ruch.ch/doc_pub/file/juwaxijorakek.pdf
    • http://peaceinsrilanka.lk/userfiles/file/69361855238.pdf
    • http://smithmurdock.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610d3b3496171---90374565898.pdf
    • https://eravukappalpalli.com/userfiles/file/94405545444.pdf
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cb870b2472d---74828392666.pdf
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/nh72ngvcqld0o9ngdjjiqh650c/82058619325.pdf
    • https://immobilgold.com/file/foxodezajuvujavidure.pdf
    • http://keyflounge.nl/userfiles/file/60159074080.pdf
    • https://hazeloyun.com/calisma2/files/uploads/jiludonifudotavitomebobu.pdf
    • http://m2m2design.com/userfiles/lulivaloje.pdf
    • https://ladachess.ru/userfiles/file/sejugudidupebujuri.pdf
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d366f438aa2.pdf
    • https://securitegenerale.tn/userfiles/file/bozixubedonu.pdf
    • http://hermangroupcorp.com/clients/3/38/389628ddbd62db2fa1e4299ecdfc1861/File/27893797195.pdf
    • http://koltoztetes-szallitas-lomtalanitas.com/ckfinder/userfiles/files/mugigomezawesududubaj.pdf
    • https://kantankacreative.com/wp-content/plugins/super-forms/uploads/php/files/d55c88461415812d61f51592d7a5e858/40120769174.pdf
    • https://mebelpozakazu.ru/wp-content/plugins/super-forms/uploads/php/files/1a5ee5cea4312aec8d242dbfa0c7e60a/kuzenufexonozeturi.pdf
    • https://fishboat.hr/files/muvukelobim.pdf
    • https://netron.pt/app/webroot/media/files/33379909943.pdf
    • http://kimdaiphatsteel.com/Images_upload/files/51317423511.pdf
    • http://camberwelltaxi.com/survey/userfiles/files/kusatajegaferosij.pdf
    • https://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/ac8fc2c75c1366dc3a8d446726ddb697/legubafibujuvidavido.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_off0000be82.bin
8c916de303355e6e905268df108a3cf67e56eba1e18e7c59f32702a30cd23535
pdf-font-stream PDF embedded font (sfnt) at offset 0xBE82 16560 bytes
font_01_sfnt_off0000e9a1.bin
cf51558effde8c7634a3129207f7184aff181d5c938eb12b88ce52110a8b8b7e
pdf-font-stream PDF embedded font (sfnt) at offset 0xE9A1 10816 bytes
font_02_sfnt_off00010230.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10230 16792 bytes