Malicious PDF — malware analysis report

Static analysis result for SHA-256 ee5b05171f0a65fb…

MALICIOUS

PDF

85.8 KB Created: 2021-09-06 10:30:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: d8f3985597caee3a940f396ef91a2acb SHA-1: de8c47931e24f35e9be674decc9c0ddef9d00262 SHA-256: ee5b05171f0a65fb7d6e3124d05f3d83bc5401e1f36866ecc243297093fa9fb6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites and are structured as a link farm. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware delivery. While no scripts were directly extracted, the PDF structure and URL patterns are consistent with techniques used to lure victims to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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 https://wastran.ru/uplcv?utm_term=using+gibbs+reflective+cycle+in+coursework+pdf PDF link annotation
    • https://engravestone.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ab6dee2778---63809564421.pdfIn PDF document text
    • http://aylincinarli.com/fckfiles/file/46707862884.pdfIn PDF document text
    • http://galenbio.com/images/upload/file/86158419259.pdfIn PDF document text
    • http://niengrangchuyensau.com/upload/contentFile/file/73714411827.pdfIn PDF document text
    • https://cpsguffanti.it/uploads/file/xapikevivoxokaxatewifezi.pdfIn PDF document text
    • https://ldcpc.com/ckfinder/userfiles/files/tazuwopajabikitimix.pdfIn PDF document text
    • http://gardnersunited.com/clients/e/eb/eb3320446930dd457027df34457c622b/File/62737181083.pdfIn PDF document text
    • http://partnercable.hu/files/3033221066.pdfIn PDF document text
    • http://csc-021.com/userfiles/file/20210903161710_2z0tjr.pdfIn PDF document text
    • http://hyundaidongdo3s.com/images/files/3922811214.pdfIn PDF document text
    • http://schouteninterieurwerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607aa298541df---nunufokogetixoxofab.pdfIn PDF document text
    • http://bjoybrands.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090e17c408a5---lurepotolilalosib.pdfIn PDF document text
    • http://napiarsaigh.com/images/53045775060.pdfIn PDF document text
    • http://chrisdepanneservices.fr/Sites/cds/files/jijevarasuruw.pdfIn PDF document text
    • https://oklogistic.lv/upload/file/wadukidugut.pdfIn PDF document text
    • http://curry-box-deluxe.de/userfiles/file/86543511482.pdfIn PDF document text
    • http://www.recetasyconsejos.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bfd7a6b3c06---37677932210.pdfIn PDF document text
    • http://ateliergermain.club/sites/default/files/file/foraxunapodi.pdfIn PDF document text
    • https://ariaparvaz.com/basefile/ariaparvazcom/files/wuzowuxofidagepabezu.pdfIn PDF document text
    • http://goldnumber.info/userfiles/file/95962947051.pdfIn PDF document text
    • http://slowjamsundays.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc9bea55730---gejakewoxipukedu.pdfIn PDF document text
    • https://www.advids.io/wp-content/plugins/formcraft/file-upload/server/content/files/160c3f0e620da4---35084178599.pdfIn PDF document text
    • https://pfgmm.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1606f4c609773c---65813232746.pdfIn PDF document text
    • http://kibbkw.com/uploads/file/fakez.pdfIn PDF document text
    • https://suhrsmad.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160bab4fac2474---8673977306.pdfIn PDF document text
    • http://recruiters-zone.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ae2c7505a7---74247582225.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_off0000dbae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBAE 11240 bytes
SHA-256: 1cd6ee1af543cf97173baa83d0c702fe2c7f3c9e97b62118ce506cbbb77e956d
font_01_sfnt_off0000f5d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5D3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010de5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DE5 22576 bytes
SHA-256: fc2b6eae541d153cbf4684af31b88d3a22fa0c15adb42930cde90279bbd2d707

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