Malicious PDF — malware analysis report

Static analysis result for SHA-256 900e04e5130169cc…

MALICIOUS

PDF

79.0 KB Created: 2021-09-03 07:53:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 1629b3ec9725615c0c4d3e764e47d6c2 SHA-1: fcbb8995811dbea7842bc41fe99b1c64b4023eac SHA-256: 900e04e5130169cc6344ec061be9a09bd29580365fd06f108332c96e661ab2c2
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to domains that appear to be compromised or disposable, as indicated by heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM'. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The primary attack pattern involves luring users to click on these external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://thefertilizerequipment.com/d/files/kofuwobaregeke.pdf In PDF document text
    • https://xn----8sbaavnccwq4am.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/059849210ab84c2cb8043628a4f89f30/rawosimegomitosipijudep.pdfIn PDF document text
    • http://snypes.nl/img/customer//files/jinabid.pdfIn PDF document text
    • http://www.nationaalgolfcongres.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1611512643b726---zotuwamukulupazotis.pdfIn PDF document text
    • http://premiumresourcing.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091a5a671f3b---48434519961.pdfIn PDF document text
    • http://www.medicalalliedtraining.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072523362da3---soxofis.pdfIn PDF document text
    • http://al-farh-iq.com/upload/userfiles/file/86209861427.pdfIn PDF document text
    • https://guptajimarriagebureau.com/userfiles/file/4753102000.pdfIn PDF document text
    • http://peak-experience-europe.com/images/blog//file/35161283498.pdfIn PDF document text
    • https://ecomassage.pt/wp-content/plugins/super-forms/uploads/php/files/ru3dhejiupe8svnnssee4ldh4j/55676707156.pdfIn PDF document text
    • https://www.allterra.group/wp-content/plugins/super-forms/uploads/php/files/241a0dcfacb4cee542775e660489c2c7/93570306873.pdfIn PDF document text
    • https://earthchartercities.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609aabb06970e---22470865876.pdfIn PDF document text
    • http://eprdel.cz/userfiles/file/lewipamepodorenivadofoxiz.pdfIn PDF document text
    • https://rhdplumbing.com/wp-content/plugins/super-forms/uploads/php/files/a08a34c20cf6dc588bd740acb8d82106/34646116350.pdfIn PDF document text
    • https://www.shropshirefurniture.co.uk/admin/ckfinder/userfiles/files/41254199158.pdfIn PDF document text
    • http://pttaccounting.com/userfiles/files/64982044318.pdfIn PDF document text
    • http://usaoxin.com/userfiles/2021-5/file/35844127984.pdfIn PDF document text
    • http://sbstroy53.ru/img/files/jorumunidepebiwananop.pdfIn PDF document text
    • https://soechi.net/userfiles/file/tatolazedimawawo.pdfIn PDF document text
    • http://krindustria.com.br/site/wp-content/plugins/formcraft/file-upload/server/content/files/160df6820d8aa7---kirazusizofokudanijax.pdfIn PDF document text
    • https://rireenfrance.com/images/upload/files/77668560339.pdfIn PDF document text
    • http://kanstm.com/ckupload/files/dozatanamolep.pdfIn PDF document text
    • https://www.growxponential.com/wp-content/plugins/super-forms/uploads/php/files/25lhaasj1fl5jds9na988842gl/53383442659.pdfIn PDF document text
    • https://eduinfinite.com/wp-content/plugins/super-forms/uploads/php/files/565e8c0ad225f1244d197216335f9f50/41453295006.pdfIn PDF document text
    • http://traktorpulling.de/ablage/userfiles/files/54892684577.pdfIn PDF document text
    • https://nakipoglugroup.com/upload/ckfinder/files/legaziboduwowuxaso.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=spartito+piano+perfect+pdfPDF 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_off0000d28e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD28E 17204 bytes
SHA-256: 13c0c2801284f2681bae48e49a5c8140ffd86d167b07691085b4859f45f13db0
font_01_sfnt_off0000fe2b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE2B 10476 bytes
SHA-256: edab2dd0d342f5fb055e7db9a1e2d4c54a80df53de093721e813dc1c1d577a32
font_02_sfnt_off00011618.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11618 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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