Malicious PDF — malware analysis report

Static analysis result for SHA-256 91317c26e1d1fd45…

MALICIOUS

PDF

81.4 KB Created: 2021-09-04 21:49:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 70e1897aff8b3096553fab8c66df7944 SHA-1: d2710bb18e303e2784db9b1d8659694b548d7fe9 SHA-256: 91317c26e1d1fd454587c3729b1ffea35855edec3a4bc713ce5626e0bdb51163
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating it's likely a phishing or malware distribution lure. The document functions as a link farm, containing numerous URLs that point to various websites, including those hosted on compromised CMS platforms. These links are designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 http://2rent.gr/userfiles/file/jotinogojebifaxug.pdf In PDF document text
    • https://commonwealthsportsawards.com/userfiles/file/51995236075.pdfIn PDF document text
    • http://constantemail.com/userfiles/file/1630093763fikep.pdfIn PDF document text
    • https://regeneracion-capilar.com/wp-content/plugins/super-forms/uploads/php/files/4fa248d33305159e5623f1797a16ea3d/63012145183.pdfIn PDF document text
    • https://www.ideaklinikbakirkoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16126e6b49c3c0---30596378357.pdfIn PDF document text
    • http://nhatrangpalace.vn/app/webroot/upload/files/jenawosonamajezun.pdfIn PDF document text
    • https://sirikulsteel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075b0aeddea3---vajidakovuvobil.pdfIn PDF document text
    • https://webmodels.studio/wp-content/plugins/formcraft/file-upload/server/content/files/1606ccd554632c---fapedibudumiwaf.pdfIn PDF document text
    • http://www.awakohchang.com/image/upload/File/788900528.pdfIn PDF document text
    • https://vinacoma3.vn/userfiles/file/41699899844.pdfIn PDF document text
    • https://pinpointfeedtech.com/ckfinder/userfiles/files/rapevesopasepomuritetiri.pdfIn PDF document text
    • https://yifff.se/userfiles/file/bezidifigovumozod.pdfIn PDF document text
    • http://thegioioto.store/upload/files/rixesujilekifuke.pdfIn PDF document text
    • https://www.adcgrain.com/wp-content/plugins/super-forms/uploads/php/files/12bc13b08583dc7f3d546e103c609945/letalotu.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/160709bdb65b8a---18401841287.pdfIn PDF document text
    • https://hankilfood.com/userfiles/file/20210826170902.pdfIn PDF document text
    • http://7166867.ru/ckfinder/userfiles/files/dofafekenutoboxizawara.pdfIn PDF document text
    • http://aircond.md/upload_fck/file/lokorudofopamuzapabi.pdfIn PDF document text
    • https://www.die-umzugsfabrik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610500f4a2716---suguxajilubejaza.pdfIn PDF document text
    • http://guowangcable.com/d/files/rajuxesivizu.pdfIn PDF document text
    • https://terravistahometeam.com/wp-content/plugins/super-forms/uploads/php/files/063e71c874344807b1e5523dae0f6cf8/luvajudedobugasivugez.pdfIn PDF document text
    • https://www.avenueroadadvertising.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083d10fae5fa---nibegalejuwuserinipovut.pdfIn PDF document text
    • http://atek-ent.com/upload/file/wugowofeg.pdfIn PDF document text
    • https://ensasoft.com.tr/wp-content/plugins/super-forms/uploads/php/files/kj7hcv5iruidicjldg52l7iufv/faxogeresawiwole.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=sumber+hukum+perdata+internasional+pdfPDF link annotation
    • 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_off0000d820.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD820 11172 bytes
SHA-256: 909ffe34b21f86359b266ad5fc46a681fe6aa22d5e4992271c74201f32736172
font_01_sfnt_off0000f1ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1CE 17832 bytes
SHA-256: 8fda8672012f6260be8dd4dc746d642b33c669b14aefbd9dd05f563c55000019
font_02_sfnt_off00011fb5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FB5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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