Malicious PDF — malware analysis report

Static analysis result for SHA-256 ec9257b21910a909…

MALICIOUS

PDF

81.7 KB Created: 2021-09-06 05:29:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: a5af998eb458166dba4cefefdc68cdbf SHA-1: e9373a442d6a6686eb1bffb2b12cd9c6e068a98f SHA-256: ec9257b21910a909932d7fde9d8928d7fe951897ab7082397174339cedcb0aca
156 Risk Score

Malware Insights

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

The ML classifier and ClamAV detection strongly indicate maliciousness. The PDF contains numerous links, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of multiple PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9944

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://www.chauffeur-prive-nice.fr/wp-content/plugins/formcraft/file-upload/server/content/files/161178d8947497---75756729094.pdf In PDF document text
    • https://meesens.be/KrMee/Tekstverwerker/raritugugujenakag.pdfIn PDF document text
    • http://broadmoor79.com/clients/864886/File/zesupezunepapefowowude.pdfIn PDF document text
    • http://happyhanool.com/ckupload/files/38599338207.pdfIn PDF document text
    • https://www.indee-r.fr/wp-content/plugins/super-forms/uploads/php/files/791de00217568ee905544b542b9873fc/mujilamuwopinid.pdfIn PDF document text
    • http://www.mtpartnersfl.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607de3d5ea02d---29280346593.pdfIn PDF document text
    • https://jetzterstrecht.hamburg/wp-content/plugins/super-forms/uploads/php/files/fmcaqbsujqm39286dua9p7ne0v/80725948030.pdfIn PDF document text
    • https://dongytueduc.com/wp-content/plugins/super-forms/uploads/php/files/5dcfkpmn9ffipkp96jg90v5spu/43650802180.pdfIn PDF document text
    • http://www.brennholz-heinlein.de/wp-content/plugins/formcraft/file-upload/server/content/files/160aace9f5373f---tumexodurufifijeb.pdfIn PDF document text
    • http://beiks.info/public/file/73881009006.pdfIn PDF document text
    • http://agataklimowska.pl/userfiles/file/1271938168.pdfIn PDF document text
    • https://maggies-handmade.com/UserFiles/files/79902239737.pdfIn PDF document text
    • http://www.tsssport.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074d1c31f74b---79720513694.pdfIn PDF document text
    • http://vdgairconditioning.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160bdab57ea19e---37050175445.pdfIn PDF document text
    • http://graczeonline.pl/userfiles/file/naderemopoporukeke.pdfIn PDF document text
    • https://www.sgestrecho.es/wp-content/plugins/formcraft/file-upload/server/content/files/16071b523c6c67---70305643540.pdfIn PDF document text
    • http://bjaimama.com/data/upload/2021/07/file/202107300343057721.pdfIn PDF document text
    • http://daltan.hu/userfiles/file/80303583541.pdfIn PDF document text
    • https://rmduncanrealty.com/userfiles/files/kotoge.pdfIn PDF document text
    • https://postelezmasivu-ostrava.cz/ckfinder/userfiles/files/wuwom.pdfIn PDF document text
    • https://www.apartamentselsllacs.com/wp-content/plugins/super-forms/uploads/php/files/eseqtf9pqq7kg8i2ibj5ge75ll/debuguzexadat.pdfIn PDF document text
    • http://ranahytta.com/ckfinder/userfiles/files/12823415165.pdfIn PDF document text
    • http://miryangpension.com/FileData/ckfinder/files/20210810_357A4683347A3DD2.pdfIn PDF document text
    • http://3handseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6f91bf1f2e---vifowowunoforiwur.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=group+2+interview+post+syllabus+in+tamil+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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ba1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA1E 11324 bytes
SHA-256: ef2d96fec2a29faf6f5bd4aeae36a483611368e8da5106f32801e62dfc749299
font_01_sfnt_off0000d4af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4AF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ecc1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECC1 20888 bytes
SHA-256: 20580dd336a5df41327207fe125d1a056c073dc8018f21d4b7b9741591e44829
font_03_sfnt_off0001207d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1207D 16160 bytes
SHA-256: fa5cbea137587b1d4bb1c548ff3f8d17a18587fe273de630a8d80f12e69f99e4

Open this report in the interactive analyzer, or submit your own file for analysis.