Malicious PDF — malware analysis report

Static analysis result for SHA-256 98d876cade646929…

MALICIOUS

PDF

71.7 KB Created: 2021-09-18 04:17:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: d8323a2fa82c61b64bb8c4addb68016a SHA-1: 945a0976514218b1532e8cf658d7121465b8abf5 SHA-256: 98d876cade64692978a6101056276e019295c27977a5b9bf9d5ee68bc27025da
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on disposable domains or compromised WordPress installations, suggesting a phishing or malware distribution scheme. The presence of a URL with a 'download among us' term indicates a lure to trick users into downloading a payload. ClamAV detection and ML classification further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://pixomot.ru/uplcv?utm_term=download+among+us+windows+7+free
    • http://ajisushionline.com/uploads/files/lonedagewawumezibuv.pdf
    • http://nfraccon.org/userfiles/file/24553897876.pdf
    • http://rusiuojigalvoji.lt/wp-content/plugins/formcraft/file-upload/server/content/files/16136f636963d7---60900435024.pdf
    • http://bodemveenweiden.nl/bodem-veenweiden-img/bolaja.pdf
    • http://zdrowejaja.com/Upload/file/26668916418.pdf
    • https://jairdefreitas.com/ckfinder/userfiles/files/paxujapokuberuzoteruwude.pdf
    • http://besteva.com/upload/files/genewajidadekixubuxan.pdf
    • http://4rrecycle.com/files/file/26204144725.pdf
    • https://castel.ro/userfiles/file/raluxakeridig.pdf
    • http://hawaiianhunareiki.it/file/63879772768.pdf
    • http://thefutureofgolf.eu/wp-content/plugins/formcraft/file-upload/server/content/files/161330bd148a25---37995176595.pdf
    • https://dubaimotorcycletours.com/uploaded_images/files/nepezeduvosewama.pdf
    • http://zimmerei-possert.at/liliduranozofubozukiw.pdf
    • http://www.ags-sib.ru/ckfinder/userfiles/files/pedopenofubalibezi.pdf
    • http://indagosrl.it/userfiles/files/xasuwadojajeku.pdf
    • http://net-marketing.hu/images/files/99043318630.pdf
    • https://rafautama.com/uploads/file/60694490556.pdf
    • https://duext.com/wp-content/plugins/super-forms/uploads/php/files/5d97b0daca221d8f723bf75ed9d7b1e9/xivudadiralobu.pdf
    • http://museodegliarazzimarsala.com/userfiles/files/49428719941.pdf
    • http://tkhomedeco.com/assets/uploads/ckedit/files/20210918053624.pdf
    • https://n95america.com/wp-content/plugins/super-forms/uploads/php/files/e301bacce46dc0761e5c71c72cfc98b5/79086353900.pdf
    • https://toocapen.com/files/89544227057.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_off0000b525.bin
14d0706190ca808aa2a53d5038850e55fdbe11e558d2c8651f781eed77ee4387		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB525 16656 bytes
font_01_sfnt_off0000e025.bin
4969200292765c4d6a1379aa2a458b2eeef88d9669f420d39feeb5e3d3cff3de		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE025 10836 bytes
font_02_sfnt_off0000f905.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF905 16792 bytes

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