Malicious PDF — malware analysis report

Static analysis result for SHA-256 c9df8cb5e320ce93…

MALICIOUS

PDF

82.9 KB Created: 2021-08-23 10:37:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: e46055b8c123f952268fcef0a5c5a64d SHA-1: d7c4f98dcb20c00efba4a948adcdeb9a31180ca1 SHA-256: c9df8cb5e320ce9370b2bdaf184606c3448482a1bd9f646f51248388c86fa542
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics as a link farm hosted on compromised CMS infrastructure, specifically WordPress. The ML classifier and ClamAV also identified it as malicious, with ClamAV classifying it as Pdf.Phishing.Trojan. The numerous embedded URLs, many pointing to potentially compromised sites, suggest an attempt to redirect users to malicious content, likely phishing or malware distribution sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 http://jointrilogy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607509ae180f6---nemogetofivumelufi.pdf In PDF document text
    • http://2013.letnifestiwal.pl/ckfinder/userfiles/files/fixuradojiru.pdfIn PDF document text
    • http://strategie-online.net/catalogue_dynamique/file/jetir.pdfIn PDF document text
    • https://roweryelectra.pl/app/webroot/uploads/file/16211990622769.pdfIn PDF document text
    • https://loan-financial.com/wp-content/plugins/super-forms/uploads/php/files/93a777d910e570fcbf4c83b3828892a4/ginejavikewol.pdfIn PDF document text
    • http://ifaistos.reality.gr/~triantaf/images/file/poguwixotofis.pdfIn PDF document text
    • http://autoscuolemontagna.it/userfiles/files/81232829751.pdfIn PDF document text
    • https://www.ferienhof-schneider.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a8740a6bb37---gemufonorapinajal.pdfIn PDF document text
    • https://alphaveneers.co.uk/wp-content/plugins/super-forms/uploads/php/files/0f5a22c86adc8b0022845f84f05f8445/wubulitopulim.pdfIn PDF document text
    • https://mithermomix.com.mx/wp-content/plugins/super-forms/uploads/php/files/1db04a447f843110d664b251e7cdadf3/zuxebixejisogiviboradodut.pdfIn PDF document text
    • https://ecoinkworld.com/wp-content/plugins/super-forms/uploads/php/files/9f193c63aeee5e8c3bd60f07d64f22e9/barupokitu.pdfIn PDF document text
    • https://ehblending.com/wp-content/plugins/super-forms/uploads/php/files/9f423963678ef959c99825ed4680f23e/95941289941.pdfIn PDF document text
    • http://przychodnia-felinskiego.pl/uploads/editor/file/savuvifokifadasexevuw.pdfIn PDF document text
    • http://bvsaigonbinhduong.com/uploads/files/zemuzijezisikirumasixo.pdfIn PDF document text
    • http://www.melloecastro.com/wp-content/plugins/formcraft/file-upload/server/content/files/160903aface229---21810145121.pdfIn PDF document text
    • https://mamotato.ro/userfiles/file/86288913048.pdfIn PDF document text
    • http://www.bridalchapel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160859a42a15c5---68681484707.pdfIn PDF document text
    • https://halobysciton.com/wp-content/plugins/formcraft/file-upload/server/content/files/160807ead90e1f---wusavigetogorubevipaz.pdfIn PDF document text
    • http://mydreamtuscanwedding.com/editor_up/90952090188.pdfIn PDF document text
    • http://fcv-bo.org/data/fcv-bo/userfiles/file/54379636060.pdfIn PDF document text
    • https://deedpoll.sg/wp-content/plugins/super-forms/uploads/php/files/2503c4e356473b5cc3dcf531c0cee59f/1878370939.pdfIn PDF document text
    • http://daotaonhaccong.com/uploads/userfiles/file/degibozudejotumoso.pdfIn PDF document text
    • https://aksusu.com/upload/files/87984902061.pdfIn PDF document text
    • http://www.icodar.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608020ec0c5aa---geburagekelarudizekuxix.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=class+of+2013+agePDF 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_off0000e223.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE223 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fa3a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA3A 10492 bytes
SHA-256: 417d628f9c8c162aa8f9e35bdd45311c429e0e805dfff455afec90ac8790c6d6
font_02_sfnt_off0001125a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1125A 16608 bytes
SHA-256: 44798896a011cec990b50a3fb0e2f24359981947924c02aac4b6c6c39a7059f3

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