Malicious PDF — malware analysis report

Static analysis result for SHA-256 9b2791a1b755ce53…

MALICIOUS

PDF

86.3 KB Created: 2021-06-27 20:45:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a9fb2a2c3104ea3c45625c50808ad76b SHA-1: d07d925e1eb4a786ca2b43d21c8508c26a7da144 SHA-256: 9b2791a1b755ce53b7ac48564f6205494a4ad5dc528bcf49c3ce40007f1eabdc
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links to external websites, many hosted on compromised WordPress installations or disposable domains, suggesting a phishing or link-farming campaign. The presence of embedded URLs and the PDF structure point towards techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://synerhu.ru/uplcv?utm_term=mperks+sign+in
    • http://simonhoirup.dk/userfiles/file/viwowa.pdf
    • http://www.lentilles-progressives.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160cf051b118b2---88972452398.pdf
    • http://www.hptindia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609619167ee44---lagudonugodegas.pdf
    • https://anthonygillant.com/userfiles/file/siparinobosebagofozu.pdf
    • https://wscnaturalhealings.com/wp-content/plugins/super-forms/uploads/php/files/f159af0842d7a4e1d9b7ad5e65ca1fd7/jukum.pdf
    • http://www.alwaysflorida.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf535b75b7e---5178648423.pdf
    • https://dakotaterritorydevelopment.com/ckfinder/userfiles/files/11091572794.pdf
    • https://fieldofgreen.com/wp-content/plugins/super-forms/uploads/php/files/0897b373fb309d1080a9866a15450b93/wekenevu.pdf
    • https://xn----7sbabak5acz7byau.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/fbe23e81817ea071342408905882766b/56438090933.pdf
    • http://toeicspeaking.net/_UploadFile/Images/file/35294433434.pdf
    • https://encoregallery.us/wp-content/plugins/super-forms/uploads/php/files/09c84dffecf666e823f1cf5d0adac3cd/99340707981.pdf
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/e6c2acc14baea6edd2b3cd4f834919d8/35614386823.pdf
    • https://brunoamaranti.it/wp-content/plugins/super-forms/uploads/php/files/6e01m7isqnc66s29c336ff7os1/zedokevunimud.pdf
    • https://doitsolutions.co/wp-content/plugins/super-forms/uploads/php/files/b16d874277e2d6f2bf21378af31fad89/lolupoxobutimimux.pdf
    • https://mithermomix.com.mx/wp-content/plugins/super-forms/uploads/php/files/acf505d6b32ed3c6ed82b1dca831f2c4/74918938160.pdf
    • http://cleannshieldflorida.com/wp-content/plugins/super-forms/uploads/php/files/627618ce6b593bf6112f18229a7dfa1c/49699405873.pdf
    • https://expeditions-travel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607166b51784c---rizepalawoko.pdf
    • https://endoaccessories.com/wp-content/plugins/super-forms/uploads/php/files/t2uh11ls7u9mlabholrj8a6g9n/kozenakajezafoxedobufexim.pdf
    • https://brunoamaranti.it/wp-content/plugins/super-forms/uploads/php/files/gr2p9cvgb5c6ul0grmkp3sqvp0/63977534858.pdf
    • http://www.everhouse.lt/wp-content/plugins/formcraft/file-upload/server/content/files/160a4790cec339---tupefemeravodulutetutoko.pdf
    • https://www.freshstartdigitalmarketing.com/wp-content/plugins/super-forms/uploads/php/files/983c34c074e9e71f0f6a343460fb66c8/fogamutokamejate.pdf
    • https://jollytime.ru/wp-content/plugins/super-forms/uploads/php/files/dcd95b0d02645389cfa7973ca8180659/54524014141.pdf
    • http://www.melodypods.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ecd6461813---jojamulonewitegalil.pdf
    • https://skazkavdom.com/wp-content/plugins/super-forms/uploads/php/files/fb80d7fada9400e37a74af59f184d72b/98511456729.pdf
    • http://hornets88.com/clients/56662/File/49757100450.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_off0000ef44.bin
aa6d2d2f44cd44b26703aba06f39200c6493d9905b0f1b4d772d3840beffed71		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEF44 17588 bytes
font_01_sfnt_off00011d8c.bin
6a9c58eea64eebc2c15ed85cfdfba8a38ee3726aa913d625c7ae88ddb3208a5f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11D8C 10084 bytes
font_02_sfnt_off00013420.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13420 16792 bytes

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