Malicious PDF — malware analysis report

Static analysis result for SHA-256 7103f61dfec7737b…

MALICIOUS

PDF

81.9 KB Created: 2021-08-04 04:02:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: e8fe9daa1396acfe3d9a7edb15b68b8b SHA-1: 250cfbe7a361ce6e60e20efdff92fbcc602c59c7 SHA-256: 7103f61dfec7737bdc8ce09b6accfd26e75bd5ece5323a1fed8cb25c7386b534
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains embedded JavaScript and numerous external links, many pointing to compromised websites or disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of creating link farms on disposable hosting, suggesting an attempt to manipulate search engine rankings or redirect users to malicious content. The embedded JavaScript, while not fully analyzed due to obfuscation, is a common vector for further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://antifftech.com/uploadfile/file///2021062818002521.pdf In PDF document text
    • http://videofilm-tv.ru/content/File/20267607738.pdfIn PDF document text
    • https://ceilford.org/wp-content/plugins/super-forms/uploads/php/files/ace8d90539cafc08ecf9c6a49847721b/zagekelexevogitim.pdfIn PDF document text
    • http://agcslohian.com/userfiles/file/rapave.pdfIn PDF document text
    • http://www.champcaregivers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a1834d87ec---jexutexevirobu.pdfIn PDF document text
    • https://arichaindia.com/userfiles/file/mapolezetaxoxonuru.pdfIn PDF document text
    • http://www.caribbeandentist.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608478efadd2a---67347997964.pdfIn PDF document text
    • https://www.bouldersudbury.org/wp-content/plugins/formcraft/file-upload/server/content/files/160cc90328d645---91128667134.pdfIn PDF document text
    • https://www.edutechusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8aeb2e3e76---87003499538.pdfIn PDF document text
    • http://abc-tel.ru/data/File/gapeloz.pdfIn PDF document text
    • http://messtores.ca/fck_user_files/file/lakotevipupunumobowitewon.pdfIn PDF document text
    • http://www.kreasoft.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1606fcf94cd03b---majobiti.pdfIn PDF document text
    • http://chronocertif.com/userfiles/file/pekitivibag.pdfIn PDF document text
    • http://coyada.com/up_images/up_images/rekipibugugati.pdfIn PDF document text
    • https://parokisantolukas.org/Uploads/userfiles/files/22506889677.pdfIn PDF document text
    • http://skuplaptop.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160ac1411cf9bd---nazigadi.pdfIn PDF document text
    • https://alshaabcoop.com/userfiles/file/xufipuvidimu.pdfIn PDF document text
    • https://uetty.xyz/js/ckfinder/userfiles/files/kogetini.pdfIn PDF document text
    • https://brylka-kfz.de/wp-content/plugins/formcraft/file-upload/server/content/files/16083013eddcf7---lilazuzumumovat.pdfIn PDF document text
    • https://dichocungtoi.com/userfiles/file/22926791544.pdfIn PDF document text
    • https://chicagoportablexray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b4910e998d6---fixivewipasuvalalakozesiv.pdfIn PDF document text
    • https://teplitsyoptom.ru/wp-content/plugins/super-forms/uploads/php/files/d78385f049c677468d4e0c86bff058c5/zedimatoruza.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/dodemddiu1u5kqipjcoi0fitnf/figogowelupenaxatut.pdfIn PDF document text
    • https://prtl.pl/userfiles/file/54200190843.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=gratis+tekstilpr%C3%B8ver+free+shipping+codePDF 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_off0000d17b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD17B 19624 bytes
SHA-256: 9ecaf6eae0c4aaa37838022f6815b9690b176d22d191bad9c1a43d01635068d1
font_01_sfnt_off0001041d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1041D 11276 bytes
SHA-256: 855817b547409ec2d1a6fd585fb74a82832f7e5ef3af8aeead0d861bf54ead17
font_02_sfnt_off00011e6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E6B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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