Malicious PDF — malware analysis report

Static analysis result for SHA-256 d55e4417e53a71fe…

MALICIOUS

PDF

85.4 KB Created: 2021-08-01 04:45:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 43772e8c2017d67ee3e489fc0e234299 SHA-1: 901c95b59cc97b621a6d6833bafc633ab7172430 SHA-256: d55e4417e53a71fe678035a843abac003d80bf59b5de73043e0533bd4d2496fe
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to compromised CMS uploads or disposable hosting, suggesting a link farm intended to redirect users. The presence of external URIs and link farms indicates an attempt to lure users to external sites, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://inwebjor.ru/uplcv?utm_term=how+to+reset+my+luxpro+thermostat PDF link annotation
    • http://pol2-simf.ru/userfiles/file/lojulisozamolezafu.pdfIn PDF document text
    • http://theopenhouseclub.com/wp-content/plugins/super-forms/uploads/php/files/284686d31925e51d62f515aefd090d70/wedidiwuwarutujeped.pdfIn PDF document text
    • https://www.ideaklinik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160b9c3ea6de93---41455088001.pdfIn PDF document text
    • http://daismene.it/file/86714478808.pdfIn PDF document text
    • https://www.marvistasales.com/wp-content/plugins/super-forms/uploads/php/files/a847171bacba716054ff3f75b2707d90/rilozujujixoxezogax.pdfIn PDF document text
    • https://vinamex.info/uploads/news_file/riliganonafi.pdfIn PDF document text
    • http://yilip.net/userData/board/file/66765780471.pdfIn PDF document text
    • http://sicilyontable.it/userfiles/files/menuvizipedazoxanig.pdfIn PDF document text
    • https://bettenbaehren.de/wp-content/plugins/formcraft/file-upload/server/content/files/160dcc4d36721c---zinalamarukef.pdfIn PDF document text
    • http://career-id.org/ckfinder/userfiles/files/ruvojudu.pdfIn PDF document text
    • https://sandzak.best/wp-content/plugins/super-forms/uploads/php/files/eb8f9816d4c65e3523f86821e2ad1595/74752856245.pdfIn PDF document text
    • http://vdtonline.vn/static/uploads/editor/files/nuwosekugurob.pdfIn PDF document text
    • http://pcccphucvinh.com/upload/files/bewuwodikokuwifuxewipel.pdfIn PDF document text
    • https://confetti-seasons.ru/upload/files/10054821848.pdfIn PDF document text
    • http://pavcargo.ru/wp-content/plugins/super-forms/uploads/php/files/d2640606ba1403628e696e7750400dd4/95835493858.pdfIn PDF document text
    • https://businessincasey.com.au/application/third_party/ckfinder/userfiles/files/1651741119.pdfIn PDF document text
    • http://josephlillianmorrisfamily.com/clients/59960/File/maramudodasajezunubi.pdfIn PDF document text
    • http://gtlmarinefuel.com/userfiles/file/15894130836.pdfIn PDF document text
    • http://debeight.net/UserFiles/File/mopiromuxuv.pdfIn PDF document text
    • http://jnafarms.com/clients/864068/File/wirugijotinam.pdfIn PDF document text
    • http://blog.crowdly.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a736bca0c14---dokanamimajuxavunajug.pdfIn PDF document text
    • https://catwalkdogcome.com/editor_upload_image/file/livegoxejun.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ec57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC57 10712 bytes
SHA-256: ac05420bd85306b5718e63277d5f0aa18cf3a4d7660a46b06ea7fcbc4d4728cb
font_01_sfnt_off00010514.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10514 16624 bytes
SHA-256: 5de5b2f2d19a7fd93dd222b7042de6bc5fb97622f944ed652c2996081f5254e1
font_02_sfnt_off00012ff8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12FF8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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