Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf06d39d20b8c700…

MALICIOUS

PDF

91.2 KB Created: 2021-07-08 04:02:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 3c91b6ed241c557ef1e7d7375320ed41 SHA-1: 61e0971900a2f715f9d5db512527f47fc679509e SHA-256: bf06d39d20b8c7000e99cf0f0c66e62c06e856dc433ce84dd7c6cde5dc1d3726
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to multiple compromised WordPress sites, suggesting an attempt to distribute malicious files. The ML classifier and ClamAV detection strongly indicate malicious intent. The presence of numerous links on potentially compromised domains, including those with 'upload' paths, points towards a distribution mechanism for malware or phishing content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9822

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 http://engroupe.ca/aym_image/files/kimikakezenisuripadomud.pdf In PDF document text
    • https://www.allterra.group/wp-content/plugins/super-forms/uploads/php/files/af2c58a8863130d70aa4fa67371af52a/moduduwajibogegegenijex.pdfIn PDF document text
    • https://www.limratechnologies.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a5d569601ef---bedafakurogajuxokufe.pdfIn PDF document text
    • https://www.crossfitparamaribo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b3cb6b25950---lofoloxunibedamig.pdfIn PDF document text
    • https://cristalensi.com/public/File/tazifusivoxegufosotitaj.pdfIn PDF document text
    • http://www.insurancedirectcanada.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160b25e6ca16af---turoxipuva.pdfIn PDF document text
    • https://ilexgold.com/app/webroot/files/userfiles/files/10335509598.pdfIn PDF document text
    • https://sevsport.info/wp-content/plugins/super-forms/uploads/php/files/938e211e0e94c041b1b389f14b3c3966/93649948497.pdfIn PDF document text
    • http://clinicaveterinariacene.com/userfiles/files/tubowipiwazaxokow.pdfIn PDF document text
    • https://thokhoavietnam.com/upload/files/vosipi.pdfIn PDF document text
    • http://oakgroveschoolheritage.com/clients/b/bc/bc5c94904a1f00f1300372e6f875146f/File/rirurixibaduviromix.pdfIn PDF document text
    • http://www.acefence.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608718e819323---94140650633.pdfIn PDF document text
    • https://amerismithenterprises.com/wp-content/plugins/super-forms/uploads/php/files/5e46ce674a36954f430220718d95f0bc/vuwugelox.pdfIn PDF document text
    • http://ccspevents.com/clients/24998/File/doxaveneve.pdfIn PDF document text
    • http://webinside.pl/userfiles/file/75626546991.pdfIn PDF document text
    • https://www.auditek.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca3225686e---32480572517.pdfIn PDF document text
    • https://carstenrath.com/wp-content/plugins/super-forms/uploads/php/files/aagga9t06ssnadnhp94ul3nt2o/31136580599.pdfIn PDF document text
    • https://webgirls-studio.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1a22c8fd5d---linig.pdfIn PDF document text
    • https://leesman.com/wp-content/plugins/super-forms/uploads/php/files/e7ae0bf98f10bd6338220f147d354cdc/3914188155.pdfIn PDF document text
    • http://coimbra.hu/uploads/ckfinder/userfiles/files/wekanuvapomegufen.pdfIn PDF document text
    • https://seeandhearbetter.ie/img/shop//contents/tavesopupuluwapategi.pdfIn PDF document text
    • http://nhuaduongnhapkhauaz.info/upload/files/vusoxokapurefubaw.pdfIn PDF document text
    • https://action-roofing.com/wp-content/plugins/super-forms/uploads/php/files/273f2e9fb7834bff806014bfe36a7da8/bazisojupezomibibizose.pdfIn PDF document text
    • http://www.kinoimaging.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16093c6258a869---xizova.pdfIn PDF document text
    • http://sangiorgioautoservizi.com/userfiles/files/liziwelelenalefulunap.pdfIn PDF document text
    • http://jingluo.net/uploadfiles/files/fuvexek.pdfIn PDF document text
    • https://www.hit-education.com/wp-content/plugins/super-forms/uploads/php/files/q0h30ho4j09m45s2qpi8o3932m/40762558745.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=drastic+games+download+for+androidPDF 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_off00010238.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10238 16768 bytes
SHA-256: a9df625bd8b8f5f3f06924eb46bca6ae06aa3da28697a7d0ddf0e8c847852035
font_01_sfnt_off00012e09.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E09 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014620.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14620 10908 bytes
SHA-256: ba4b764becb5fd9555eafdadcfb3e617464a274ea21f32122c3c60e147dab44f