Malicious PDF — malware analysis report

Static analysis result for SHA-256 3d25eb326850e8b4…

MALICIOUS

PDF

102.3 KB Created: 2021-07-31 05:32:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: a5ec512030e50b9c9df13e84428ea5a8 SHA-1: b97777e2ca8f88e2412b7a2f91facb31c99d0750 SHA-256: 3d25eb326850e8b4bce6d44beeecedfa5a681070ef0a85fcbdf6eb2a8959746b
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external URIs and links to compromised CMS uploads, suggesting it functions as a link farm to distribute further malicious content or phish users. The presence of multiple distinct hosts and UTM parameters in the URLs points towards a coordinated effort to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9918

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://drafthe.ru/uplcv?utm_term=what+is+a+major+disadvantage+of+the+observation+research+method PDF link annotation
    • https://felix-schulze.biz/wp-content/plugins/super-forms/uploads/php/files/ofi14mmiv46fpfasrhvl552gjo/fomokivo.pdfIn PDF document text
    • https://immo-cjeanpaul.lu/userfiles/files/7461040634.pdfIn PDF document text
    • https://mithermomix.com.mx/wp-content/plugins/super-forms/uploads/php/files/12c8d81f772006b4a1b8abbcbad9e96e/54325762451.pdfIn PDF document text
    • http://novaserv.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f40f4ded24---basinukumuzepobaditak.pdfIn PDF document text
    • https://securitydm.com/slicice/file/neviboxedegisimotade.pdfIn PDF document text
    • http://asesorialuishervas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa25ca00de3---75790615197.pdfIn PDF document text
    • https://songhong.info/userfiles/file/fulibunaganuripozadatel.pdfIn PDF document text
    • http://shipagents.nl/uploadfiles/file/pelusijukadefivageda.pdfIn PDF document text
    • http://www.investing-in-women.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bcd6d6cb9da---71347936674.pdfIn PDF document text
    • https://www.dyna-tech.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16088f09c7a7bb---75054947934.pdfIn PDF document text
    • http://jyotiacademicpress.org/uploads/file/15288753593.pdfIn PDF document text
    • http://n2nlah.org/UserFiles/file/rusulejevavuroz.pdfIn PDF document text
    • http://alnoorcity.com/userfiles/file/28238851530.pdfIn PDF document text
    • https://www.ppmcare.co.uk/wp-content/plugins/super-forms/uploads/php/files/hn8so3rvofbbk4rs1upvl2ko4i/3374494370.pdfIn PDF document text
    • https://medicinasolidale.org/wp-content/plugins/super-forms/uploads/php/files/09101814980225c32f45707e2f6fa7e9/bomesidovopiwezivazidov.pdfIn PDF document text
    • http://la-roofers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160eca406f1d63---gejogedorikolif.pdfIn PDF document text
    • http://kimandyoo.com/userfiles/file/dolib.pdfIn PDF document text
    • https://advik.net/userfiles/file/toresexokigisulunadobavew.pdfIn PDF document text
    • https://bizdrive.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/160a9045f34cc8---18165019225.pdfIn PDF document text
    • https://enville.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071dce42d154---66861218771.pdfIn PDF document text
    • https://www.denisonlandscaping.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c4843e43dd8---60512278346.pdfIn PDF document text
    • http://www.kmclogistics.com/wp-content/plugins/super-forms/uploads/php/files/2bbcaf9fdf2cfcabf7b04b9832fd3ebd/vivilekaniwufapifesumekar.pdfIn PDF document text
    • http://chalappuram.com/userfiles/file/xujuzijis.pdfIn PDF document text
    • https://kingdomofgodmn.org/userfiles/files/38449878875.pdfIn PDF document text
    • http://korean-school.hu/hangul/userfiles/file/selemadomisut.pdfIn PDF document text
    • https://www.baptistenhardenberg.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1606c935c81c11---tulaninuzazojidav.pdfIn PDF document text
    • http://bertrandetgastineaudesigners.fr/userfiles/file/zegupojipuxenuwelu.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00012a80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A80 17400 bytes
SHA-256: c9fb68b1be96fc6d95f9f40aa7fac557d875d32e74b87bb074051558bb556c7b
font_01_sfnt_off00015860.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15860 11208 bytes
SHA-256: 6a12b27c163efae57d69b4f7924ee95d05f91c89a225fa24ad3af6cfdd6d1ef2
font_02_sfnt_off00017239.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17239 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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