Malicious PDF — malware analysis report

Static analysis result for SHA-256 797e5b5ea1c86a6d…

MALICIOUS

PDF

94.6 KB Created: 2021-07-01 19:27:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 45909d447d477f9d748d1e652dc9bd43 SHA-1: 1617dc85d57ee32790e2dc405f9a4b0fba6139ca SHA-256: 797e5b5ea1c86a6d0c47cd57ae483c547bab0a7542dccfe2c9953e2627f442d1
156 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, indicating a link farm or phishing lure. The ClamAV detection and ML classifier strongly suggest malicious intent. No scripts were extracted, but the presence of multiple compromised upload links points to an attempt to distribute malicious content or redirect users to phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9935

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://www.synergyheart2heart.team/wp-content/plugins/super-forms/uploads/php/files/anq3reaik7vhdhdq23hb04l4qe/8149965218.pdf In PDF document text
    • https://stef-nancy.fr/upload/document/rikejibixewuz.pdfIn PDF document text
    • http://adhdadvisory.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cf82a554501---25733584939.pdfIn PDF document text
    • https://www.havanasalsa-dance-tours.com/wp-content/plugins/super-forms/uploads/php/files/04192d33e1969da27799cdf0e88dc4b9/sedaxiritumitedesu.pdfIn PDF document text
    • https://www.die-umzugsfabrik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b3dd5ce7c4f---tolikawenakivig.pdfIn PDF document text
    • http://www.mezmat.ru/ckfinder/userfiles/files/vefazuripekev.pdfIn PDF document text
    • https://ceilford.org/wp-content/plugins/super-forms/uploads/php/files/49c8b8e705507f8ff5ff1d89e0677fb7/83316769685.pdfIn PDF document text
    • http://cdhsalumni.com/clients/28864/File/29286731559.pdfIn PDF document text
    • http://www.radiopopiatej.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a46528d27af---97563405517.pdfIn PDF document text
    • http://casinodanmarkjackpot.dk/userfiles/file/31981419484.pdfIn PDF document text
    • https://lsp.od.ua/wp-content/plugins/super-forms/uploads/php/files/dipr29t6o9923ggqt4ipmvaej2/jugupiwixus.pdfIn PDF document text
    • http://analogsys.com/uploaded/file/18435168016092a4e9b71d0.pdfIn PDF document text
    • https://murderescape.com/wp-content/plugins/super-forms/uploads/php/files/ec74a7b1b7e793e72610f549de83ac5d/wevikuwebi.pdfIn PDF document text
    • http://opalsolar.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16087db4fee92b---8221117009.pdfIn PDF document text
    • https://canadiancontractorservices.com/wp-content/plugins/super-forms/uploads/php/files/ec3bs10gn55fiqpvgg7c6f6u80/tolodaboperav.pdfIn PDF document text
    • http://donghocasiochinhhang.net/uploads/userfiles/file/sutemaworanowigutebedog.pdfIn PDF document text
    • https://fiambreszav.com/wp-content/plugins/super-forms/uploads/php/files/980163612e54f32318668cd57812e781/17756309700.pdfIn PDF document text
    • https://tripleccompanies.com/wp-content/plugins/super-forms/uploads/php/files/d0d45108d633deb7eee4e392faec9539/bikamuririla.pdfIn PDF document text
    • https://lokmangal.co.in/wp-content/plugins/super-forms/uploads/php/files/6383da802d4f84e6e05590a890c57cef/54040548325.pdfIn PDF document text
    • https://www.albispanaderia.com/wp-content/plugins/super-forms/uploads/php/files/fbc81f000c69ddb3a91c2ff1dd05fe11/64982563684.pdfIn PDF document text
    • http://zulassung4you.de/bilder/file/karabixarukanezebarafebez.pdfIn PDF document text
    • https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/3e47b542abe0555807bfed1bd0f836d0/64371994310.pdfIn PDF document text
    • http://toddfamilyreunion.com/clients/4/48/482e924d5a052aa4a0c13eb8a30e0bc8/File/16386570204.pdfIn PDF document text
    • http://curry-box-deluxe.de/userfiles/file/degemuwibijewikekugela.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=business+word+problems+with+solutions+and+answersPDF 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_off00010d91.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D91 17500 bytes
SHA-256: 5cb07b0ef3cb379616b40a4ea649d964597861eb295e46609fdd9f6cde22fd10
font_01_sfnt_off00013b29.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B29 11036 bytes
SHA-256: 744b91751c030d8bd02cbbb283c5ef274171d996b1bba135eea3587c5a43a35f
font_02_sfnt_off00015480.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15480 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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