Malicious PDF — malware analysis report

Static analysis result for SHA-256 335be6ac8c8f1cbd…

MALICIOUS

PDF

77.1 KB Created: 2021-09-18 02:30:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 00a2d3165ae17315f4cdedda8471bf9e SHA-1: f7195df121d7656c3ed1561758bb1796eec1bc6d SHA-256: 335be6ac8c8f1cbde86af1915cb9ae9acdfa8f18fc6cfc72ec57612a98f3a354
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, containing numerous URLs pointing to compromised WordPress sites and disposable domains. These links are likely used to redirect users to phishing pages or download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

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://synerhu.ru/uplcv?utm_term=contraction+timer+android PDF link annotation
    • http://123flower.doweb.kr/upload/files/33049963985.pdfIn PDF document text
    • https://kolkataangikar.org/ckfinder/userfiles/files/70754181751.pdfIn PDF document text
    • http://kelsenator.com/userimages/9033917950.pdfIn PDF document text
    • http://becro-plast.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1614236ee48768---18113492595.pdfIn PDF document text
    • https://www.mercato.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1613b2f7ec6b8a---47623573822.pdfIn PDF document text
    • http://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/161442658572e6---8964602995.pdfIn PDF document text
    • http://pttaccounting.com/userfiles/files/17299002905.pdfIn PDF document text
    • http://osteriadelcampanile.com/userfiles/files/51545384047.pdfIn PDF document text
    • https://www.pferde-fuer-unsere-kinder.de/wp-content/plugins/formcraft/file-upload/server/content/files/16137eca891deb---73922552515.pdfIn PDF document text
    • http://neboskreb-irk.ru/uploads/userfiles/files/fogub.pdfIn PDF document text
    • http://www.europesolidaire.eu/userfiles/files/35650113216.pdfIn PDF document text
    • http://jsdarvin.com/files/30747760593.pdfIn PDF document text
    • http://vannordenvastgoed.nl/userfiles/file/51728837017.pdfIn PDF document text
    • https://www.teppiche-waschen-hamburg.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613672ad432bd---wiwojisoforakigil.pdfIn PDF document text
    • https://smsenerji.com/resimler/files/kewavexufajowepivuwudev.pdfIn PDF document text
    • http://chikatere.com/Upload/files/tadodew.pdfIn PDF document text
    • https://taybaite.com/userfiles/file/60348063567.pdfIn PDF document text
    • https://mercedesmazo.es/wp-content/plugins/formcraft/file-upload/server/content/files/1613adf9d82847---40019092319.pdfIn PDF document text
    • http://www.xpresswedding.com/wp-content/plugins/formcraft/file-upload/server/content/files/161416a6ad1fe7---91405873310.pdfIn PDF document text
    • http://beiks.info/public/file/21990091572.pdfIn PDF document text
    • https://cfi-registration.amyhalter.com/buzzboxgift/img/userfiles/files/26761019166.pdfIn PDF document text
    • http://faurerom.com/userfiles/file/176223210.pdfIn PDF document text
    • https://byocamacho.com/ckfinder/userfiles/files/jiserisigasiriju.pdfIn PDF document text
    • http://ketoanaca.com/uploads/image/files/83264310578.pdfIn PDF document text
    • http://vuatoyen.com/uploads/userfiles/file/32323297679.pdfIn PDF document text
    • https://motiwalainstitutes.org/userfiles/file/rezawalituxigupava.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_off0000cacf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCACF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e2e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2E1 17112 bytes
SHA-256: 85bcd0ca53b995967676da36c0c0e2ffde8fe726fb2a5dc862823eae2ed96b45
font_02_sfnt_off00010f51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F51 10348 bytes
SHA-256: ffc114511adc6394b6542a21c076df72e9f8a7c9cfb51fa70baefcaac2dc0f53

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