Malicious PDF — malware analysis report

Static analysis result for SHA-256 988640f728e03529…

MALICIOUS

PDF

80.1 KB Created: 2021-09-21 03:00:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 2053b4ea91eed79dac87dfd2f7278315 SHA-1: 88512ed567d2d690f603ac87ec778ff4cc16859b SHA-256: 988640f728e035290c2e884733ed1d888b5d02b53d412fc3916b7e51fc21a33c
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to compromised websites or disposable hosting, indicating a link farm designed to lure users to potentially malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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://st-johnson.com/Uploadfiles/files/folatur.pdf In PDF document text
    • http://www.goataxiservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614007b8679d8---85718957883.pdfIn PDF document text
    • https://markzone.az/wp-content/plugins/super-forms/uploads/php/files/tsd6j6o79ts3bbj5uua6vc3e55/sonuvu.pdfIn PDF document text
    • https://gz-topstar.com/wp-content/plugins/super-forms/uploads/php/files/004083638779b3533d0c03218048f4c2/nameditetufodamuj.pdfIn PDF document text
    • https://umartravel.com/files/sajufepojejudamuzorufobub.pdfIn PDF document text
    • https://www.jaegeraviation.com/ckfinder/userfiles/files/rabekipil.pdfIn PDF document text
    • https://surupaceanu.ro/ckfinder/userfiles/files/zavufivubur.pdfIn PDF document text
    • http://pavcargo.ru/wp-content/plugins/super-forms/uploads/php/files/e9a064a27da1efb056cab400f2355dd1/dobimotofiwero.pdfIn PDF document text
    • https://techson-cctv.com/upload/file/refexemabok.pdfIn PDF document text
    • https://ncvpte.in/userfiles/file/xuwijadovimerot.pdfIn PDF document text
    • http://dreamsurgerycn.com/ckupload/files/bakomegirebumomilidupik.pdfIn PDF document text
    • https://masihpt1.com/contents/files/gipog.pdfIn PDF document text
    • https://gamepinleri.com/calisma2/files/uploads/vozosejojado.pdfIn PDF document text
    • https://beautyyaurient.com/editor_upload/file/dupebaligetuxaxomuvewe.pdfIn PDF document text
    • http://heilpraxis-pankow.de/wp-content/plugins/formcraft/file-upload/server/content/files/16147f87726e13---57001225818.pdfIn PDF document text
    • http://www.awakohchang.com/image/upload/File/osuwojus.pdfIn PDF document text
    • http://mrspk.com/ckfinder/userfiles/files/pazuvevadodezadudesasa.pdfIn PDF document text
    • http://nenayu.com/filespath/files/20210921073656.pdfIn PDF document text
    • http://kondicionery-krasnogorsk.ru/upload_picture/file/gidetirapolibupisufik.pdfIn PDF document text
    • https://asiarsolutions.com/userfiles/file/xilula.pdfIn PDF document text
    • http://www.insurancedirectcanada.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16144bb631a8fb---rumesuwitadutukutotu.pdfIn PDF document text
    • https://www.opdrrustukalac.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140c84bbd297---gazotaxolinexo.pdfIn PDF document text
    • http://mamnonsaokhue.vn/app/webroot/files/ckfinder/files/retutanana.pdfIn PDF document text
    • http://freeorden.com/media/file/71406337384.pdfIn PDF document text
    • https://lazdynumokykla.lt/userfiles/file/budodowudugawadopug.pdfIn PDF document text
    • https://diversifiedhumansolutions.com/wp-content/plugins/super-forms/uploads/php/files/6d7cbed5eb2d2d782c2a7b1368a90261/bovejezil.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=xender+app+download+2020+download+download+free+downloadPDF 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_off0000d644.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD644 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ee56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE56 17188 bytes
SHA-256: 99d81bf4e917b9f3c6f75badac91605334789e6b543add78c8be942c9cb023db
font_02_sfnt_off00011a79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A79 10468 bytes
SHA-256: ee87f4921d4e61e77b217eec1e98251590c3d3368ed43540ea840f18914985e5