Malicious PDF — malware analysis report

Static analysis result for SHA-256 e8edf099a63bdcbc…

MALICIOUS

PDF

82.5 KB Created: 2021-09-17 04:08:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: f9facede53e0396ff36d162afa22d4bd SHA-1: b73ce19d3f35f72e2c7413ac7ca04fad9303615f SHA-256: e8edf099a63bdcbce5afbec6847492edb4ef4d7812d9956ca0956613e2f359e8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links, many pointing to compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The presence of external URIs and compromised upload links points to a tactic of using potentially untrusted or compromised infrastructure to host or link to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://drafthe.ru/uplcv?utm_term=sailing+simulator+app PDF link annotation
    • http://brucemayrockinstitute.com/assets/ckfinder/core/connector/php/uploads/files/tebukosajunadedut.pdfIn PDF document text
    • http://mskabel.cz/UserFiles/File/kafagurelujuxav.pdfIn PDF document text
    • https://langumeistras.lt/i/File/44935449324.pdfIn PDF document text
    • http://ulleungroadtour.com/FileData/ckfinder/files/20210901_DD3E02DC8701D57C.pdfIn PDF document text
    • http://m-s-g.ru/userfiles/files/16224676415.pdfIn PDF document text
    • http://kanalizace-ul.cz/userfiles/file/80942083702.pdfIn PDF document text
    • https://10kshot.com/customerinterview/ckfinder/userfiles/files/vusabogutidijerepejit.pdfIn PDF document text
    • http://polskienarty.pl/data/aktualnosci_imgs/file/vinojazexasamupa.pdfIn PDF document text
    • https://alrukn.co/userfiles/files/falebono.pdfIn PDF document text
    • http://drinkandshrink.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/161400490823b2---44536988748.pdfIn PDF document text
    • http://brighterhealthcare.co.uk/wp-content/plugins/super-forms/uploads/php/files/eb0j13gdnfaihu71p3lk26udgs/1416157422.pdfIn PDF document text
    • http://hometextiles-consultant.com/ckfinder/userfiles/files/namamodelefovakexo.pdfIn PDF document text
    • https://barcelonacentremedic.cat/files/galeria/files/67626055416.pdfIn PDF document text
    • https://novitas.ro/files/75219383521.pdfIn PDF document text
    • http://srmtteaparty.com/uploads/files/202109122215273506.pdfIn PDF document text
    • https://ohligschlaeger-berger.de/wp-content/plugins/formcraft/file-upload/server/content/files/161436c848e3e5---zojujeno.pdfIn PDF document text
    • http://humidorio.de/ckfinder/userfiles/files/54716281932.pdfIn PDF document text
    • https://dondepodemosir.com/userfiles/file/wepewezitone.pdfIn PDF document text
    • http://universalestetic.com/userfiles/file/89372479237.pdfIn PDF document text
    • http://unsersohn.com/images/file/luxodomilavoxudupeviro.pdfIn PDF document text
    • http://tehla.eu/userfiles/file/vojoxagefelelepafisujobaj.pdfIn PDF document text
    • http://dae-young.kr/upload/fckeditor/file/gutoreferogozuvobo.pdfIn PDF document text
    • http://minhledtran.com/luutru/files/66058201992.pdfIn PDF document text
    • http://stellar-toys.com/ckfinder/userfiles/files/56979386874.pdfIn PDF document text
    • http://branpc.in/ckfinder/userfiles/files/dajanefamisosome.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_off0000deaf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEAF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f6c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6C1 17320 bytes
SHA-256: 9413da46ba150a974c9c9f10e266759d231371a3376e41a7a1c3aee4221588ec
font_02_sfnt_off0001240e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1240E 10636 bytes
SHA-256: 7849d2352e5a9ae0ad348ee4d2d5ee027a251f29edec3f5521b609c76036759e

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