Malicious PDF — malware analysis report

Static analysis result for SHA-256 a98802f7df6950aa…

MALICIOUS

PDF

92.8 KB Created: 2021-07-03 19:47:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 574b2074594832c2a21d67c8f410b04c SHA-1: 6f72beda46f9bbad0ec531a4f9a4cc6577ba9b15 SHA-256: a98802f7df6950aa52e17b0ab1c4ce470e4804336e169efdfbeb6030489f007e
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains numerous embedded URLs that form a link farm, pointing to compromised WordPress sites and disposable hosting. The primary URL, 'https://coretry.ru/uplcv?utm_term=another+word+for+simular', suggests a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9922

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://coretry.ru/uplcv?utm_term=another+word+for+simular PDF link annotation
    • https://discoverapartmentsforrent.com/wp-content/plugins/super-forms/uploads/php/files/1f8a78693bf4b2f873e4205573f7a582/72148631065.pdfIn PDF document text
    • https://paloaltospeakerseries.com/wp-content/plugins/super-forms/uploads/php/files/e6c66eab68a03bbfb607cedd3f8d7c6b/konepigizututibewa.pdfIn PDF document text
    • https://pk-kuepfer.ch/ckfinder/userfiles/files/44628240008.pdfIn PDF document text
    • http://195exim.com/datas/files/bujamagimuvesuje.pdfIn PDF document text
    • https://medicinasolidale.org/wp-content/plugins/super-forms/uploads/php/files/444a054334180017fb2d2fc446407f42/15808769159.pdfIn PDF document text
    • https://www.m2asolutions.com/wp-content/plugins/super-forms/uploads/php/files/de989ec64535c3ccc0d82fc3516f3502/8424612745.pdfIn PDF document text
    • https://binarbaidfabrication.com/public_html/userfiles/file/8294711200.pdfIn PDF document text
    • http://aberdeeneyes.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608141c9ee258---nesonotufujudoxake.pdfIn PDF document text
    • https://capital-tic.com/upload/ckfinder_temp/files/20210526201533.pdfIn PDF document text
    • https://stcatherine.ac.ug/wp-content/plugins/formcraft/file-upload/server/content/files/16081e77c6f87c---mososipepolo.pdfIn PDF document text
    • http://ledson.ru/upload_picture/tusofobevuf.pdfIn PDF document text
    • https://www.webhisto.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160c4a07af250e---wozewajuxe.pdfIn PDF document text
    • https://masterok-kovka.ru/wp-content/plugins/super-forms/uploads/php/files/b82faf14de379ccdab5072ad81d6f2b0/laseweripaxuxelagegiw.pdfIn PDF document text
    • http://goldnumber.info/userfiles/file/17519832702.pdfIn PDF document text
    • https://petroblend.com/wp-content/plugins/formcraft/file-upload/server/content/files/160773956b7c1e---fitugizabilalaz.pdfIn PDF document text
    • http://global-poseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d91c79699ef---34762894490.pdfIn PDF document text
    • https://seataclightingalaska.com/wp-content/plugins/super-forms/uploads/php/files/c9918cf476b1478b4b3711d64541ba07/15684358463.pdfIn PDF document text
    • http://africanhairbraidingsalon.com/userfiles/file/tojivedewi.pdfIn PDF document text
    • http://www.jesuseslaroca.org/wp-content/plugins/formcraft/file-upload/server/content/files/16098d38747f29---37080529190.pdfIn PDF document text
    • https://controlcert.se/wp-content/plugins/formcraft/file-upload/server/content/files/16090674806a0d---80846023649.pdfIn PDF document text
    • https://sharpspringwww.kinsta.cloud/wp-content/plugins/super-forms/uploads/php/files/3665e0e10b89ba48278850533e4acad8/42461852396.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

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dbc5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBC5 2496 bytes
SHA-256: f73c7b9d0655fe2566d49b5d5c73a0ff62931f8f5055ef2eaabe02d983c258f5
font_01_sfnt_off0000e6a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6A1 20824 bytes
SHA-256: de822f7eb253b08576c4072f15024e784be4d06130648e1b2b5c23db17d5462f
font_02_sfnt_off00011b83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B83 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00013394.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13394 16604 bytes
SHA-256: 90ad9887b6ba44d1edd338af656c018eb194a4eae491fde584693f97d3ba183c
font_04_sfnt_off00014b02.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14B02 10788 bytes
SHA-256: d109a9a780dd319d644cae9e6b73a90399f3292c2af76cfb66de384188fcf2ed

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