Malicious PDF — malware analysis report

Static analysis result for SHA-256 c907a3b2b2a15ded…

MALICIOUS

PDF

75.4 KB Created: 2021-09-07 23:43:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: e7170455a4826b1d03cc33f4a1db7a30 SHA-1: fca70e6cc362cc7d30e2ac8be9d956f15d080d82 SHA-256: c907a3b2b2a15dedb46a999e667f8a2022cfa771612abd48bf5a4cbe2b8827d8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The document contains numerous external URIs and is identified as a link farm, likely designed to redirect users to phishing sites or download further malware. The presence of multiple compromised CMS upload links further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://chcial.ru/uplcv?utm_term=simple+adding+polynomials+worksheet PDF link annotation
    • https://channeloflove.com/ckfinder/userfiles/files/defusi.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/813025caa5ce022de8de990fd92b4f14/revuwa.pdfIn PDF document text
    • https://eastmanllc.net/ckfinder/userfiles/files/mikebibujafus.pdfIn PDF document text
    • http://vietxetai.com/wp-content/plugins/super-forms/uploads/php/files/v81hrf30sjv43ikoo32enei3gn/89400153505.pdfIn PDF document text
    • http://ebsenglish.net/_UploadFile/Images/file/sokevebazozazelikujavut.pdfIn PDF document text
    • https://komunalno-vrgorac.hr/files/nopuludetenotijoneru.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/1607a657c55c73---80790096901.pdfIn PDF document text
    • http://yakutiaprime.ru/SITE/files/editor/file/kuvawapunif.pdfIn PDF document text
    • http://www.infranetltd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f67987c780---bedubol.pdfIn PDF document text
    • http://www.ibadirect.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d87b49a914---wotuvatuluwipiku.pdfIn PDF document text
    • https://luxmarketing.agency/wp-content/plugins/super-forms/uploads/php/files/k2vqgfn7b1s08iu295s4e20v87/zobaveronifatowado.pdfIn PDF document text
    • https://readxyz.org/wp-content/plugins/super-forms/uploads/php/files/54754a763597702c2f0483b7ba3b7aa7/pawunabazodikewel.pdfIn PDF document text
    • http://icwest78.com/clients/67591/File/52984990170.pdfIn PDF document text
    • https://www.toptalentusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d518d84682---rakamuzuxonowiluzib.pdfIn PDF document text
    • http://becro-plast.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1607bf9f9c2eea---43141334780.pdfIn PDF document text
    • http://sicilalluminio.it/userfiles/files/83222507769.pdfIn PDF document text
    • http://www.rpv-drachten.nl/files/file/98036242337.pdfIn PDF document text
    • http://we2meeting.com/ckfinder/userfiles/publics/files/vojenukerinitejuvibe.pdfIn PDF document text
    • https://cuatudongsaigon.vn/uploads/files/jumuzububukevufe.pdfIn PDF document text
    • http://iltorg.ru/upload/file/92310454227.pdfIn PDF document text
    • https://mimpishio1bet.com/contents//files/lapexobikedugisixapa.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_off0000c253.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC253 11208 bytes
SHA-256: 05bcf131e169de6e318fe6057e097b5430bee76f2ad99d4f62f0b9851cd2eb49
font_01_sfnt_off0000dc32.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC32 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f444.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF444 16912 bytes
SHA-256: 37181f87009c693ab5a5839ca5af872cf76604100f28ecbb1a942bb2300ab2df

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