Malicious PDF — malware analysis report

Static analysis result for SHA-256 e8fff7b1e722ca23…

MALICIOUS

PDF

86.5 KB Created: 2021-08-14 19:10:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: 82630e1f4b17b7949548601f5d020e5d SHA-1: c1c8b2701d123164ba7033b61b262f5a5fe7236a SHA-256: e8fff7b1e722ca23c13e1aee7323aebf569436957b9f91146ac3393aa3b47268
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with numerous URLs pointing to compromised CMS uploads and disposable hosting. These links likely serve as a redirection mechanism to deliver a malicious payload or phish for user credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://hattingtoemrerogsnedker.dk/userfiles/file/kovarudakes.pdf In PDF document text
    • http://cbelmira.com/wp-content/plugins/super-forms/uploads/php/files/oh8jmudht24ktjk342m29lf3j3/faxex.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/662e14ec22f644401b1a9a871e88bec3/todinozudinuni.pdfIn PDF document text
    • http://zovsh.com/Uploadfiles/files/radonedoxifupe.pdfIn PDF document text
    • https://www.sesc.com.ua/wp-content/plugins/super-forms/uploads/php/files/sogqhua7tgms54h14utd371a27/29996208751.pdfIn PDF document text
    • http://pansophers.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082d9cb1a847---zonusinapegomo.pdfIn PDF document text
    • http://xedaptheduc.net/app/webroot/uploads/files/fimopojafakuzudogalon.pdfIn PDF document text
    • http://www.itbaloch.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d91a60065c---buliwovopim.pdfIn PDF document text
    • http://krindustria.com.br/site/wp-content/plugins/formcraft/file-upload/server/content/files/1607db1689d2bf---komowilobapibe.pdfIn PDF document text
    • https://deewo.de/wp-content/plugins/formcraft/file-upload/server/content/files/16084d7b8719b3---wunalofufiwogaro.pdfIn PDF document text
    • http://aias.pnu.ac.th/ckfinder/userfiles/files/77900236971.pdfIn PDF document text
    • https://www.vibrationmonitoring.asia/wp-content/plugins/formcraft/file-upload/server/content/files/160ae7b378d4e8---mavepanebo.pdfIn PDF document text
    • https://polskieplytki.com/wp-content/plugins/super-forms/uploads/php/files/570985974aaf98c9eef24a94089c6fe9/vibawobonalumoxete.pdfIn PDF document text
    • http://sunjewelsonline.com/userfiles/file/77216103838.pdfIn PDF document text
    • https://laneopx.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607432545f190---90780558988.pdfIn PDF document text
    • http://n2nlah.org/UserFiles/file/lodonevovatadalewukinafap.pdfIn PDF document text
    • http://www.rlktechniek.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609f028f371e5---nazikemukegi.pdfIn PDF document text
    • https://www.mybizwebsites.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c5bc2b57e18---37896264856.pdfIn PDF document text
    • https://www.amiunaorchestra.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160987a2b53257---zuzuxadusabifixunekinade.pdfIn PDF document text
    • http://ctmmaximoravenna.com/ckfinder/userfiles/files/puditeboxobibuwukorakopi.pdfIn PDF document text
    • https://www.dishdivvy.com/wp-content/plugins/super-forms/uploads/php/files/816935e5eb138dea20f4242bf978a614/bumofakixulowaba.pdfIn PDF document text
    • https://hojoairport.com/images/file/zogurovabawimizotasagegi.pdfIn PDF document text
    • http://backkwang.com/userData/board/file/32320568420.pdfIn PDF document text
    • https://pabrikangka.com/contents//files/ragefefusodej.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=how+to+evaluate+a+nursing+homePDF 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_off0000ee2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE2F 17072 bytes
SHA-256: 5d7eb5d432ad20861ecf7c3464c119f377906f5f2a42e4d39233b50dc7338ef4
font_01_sfnt_off00011b0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B0E 10800 bytes
SHA-256: 93e2a15c22f5254b25c67574905bc0cbbd74c056339eebddea83cff8b5072464
font_02_sfnt_off000133c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x133C5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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