Malicious PDF — malware analysis report

Static analysis result for SHA-256 870f63a75cf76d12…

MALICIOUS

PDF

82.0 KB Created: 2021-09-07 05:01:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: dac232d30dfbd2067883ea25b224bb3a SHA-1: a9d307735e8026b64f49eb045063e0fef6fddb16 SHA-256: 870f63a75cf76d12336ac8f88615277f479902e726f425a7e38e9214415fc336
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to domains flagged as disposable or compromised, indicating a link farm designed to redirect users to potentially malicious sites. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware delivery. The `PDF_SEO_DISPOSABLE_LINK_FARM` heuristic confirms the nature of the links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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://ecogestval.com/userfiles/file/limirokurezogilolavawotiz.pdf In PDF document text
    • http://villa-carlshorst.de/sites/default/files/file/kuromituvavik.pdfIn PDF document text
    • https://benqmusicworkshop.com/fupload/file/tozem.pdfIn PDF document text
    • http://lenosada.sk/editor_uploads/files/63399817928.pdfIn PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/722ff53b845a441928d58af131657331/39688578774.pdfIn PDF document text
    • http://jiangsutravel.kr/userfiles/files/20210820_223410.pdfIn PDF document text
    • http://poiskvod.ru/images/file/kevoxigixelagomenefigozas.pdfIn PDF document text
    • http://youngshiny.com/userfiles/file/1626372297.pdfIn PDF document text
    • https://victory-agency.com/wp-content/plugins/formcraft/file-upload/server/content/files/161167e719b8dc---xilelojewororelofulexil.pdfIn PDF document text
    • https://www.andrecampbell.ca/wp-content/plugins/super-forms/uploads/php/files/d67e2c2195041ec39d37e50f45e549ef/8881751505.pdfIn PDF document text
    • https://aiaciran.org/cache/fck_files/file/37162327473.pdfIn PDF document text
    • http://cosmeticdermatologymiamibeach.com/uploads/data/files/rekiwixo.pdfIn PDF document text
    • https://www.tai.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160c8ca96b3940---60466945632.pdfIn PDF document text
    • https://deconkhoemanh.com/wp-content/plugins/super-forms/uploads/php/files/6rlhjdtd13h5o4fam61ovpf45j/pufaxopi.pdfIn PDF document text
    • https://hrmconsulting.biz/upload/files/dizuzorajasuzafefuv.pdfIn PDF document text
    • https://alarouba.com/ckfinder/userfiles/files/vujatimetoxuwoxiwexapixow.pdfIn PDF document text
    • https://luminex.pl/upload/file/67261704281.pdfIn PDF document text
    • https://www.hippocratio.gr/ckfinder/userfiles/files/xikodijaxupur.pdfIn PDF document text
    • http://graham1978.com/clients/79565/File/wubalazepozobofeteke.pdfIn PDF document text
    • http://peak-experience-japan.com/images/blog/file/54980158394.pdfIn PDF document text
    • http://expertcomptablecourreges.fr/michel_courreges/userfiles/file/60689113933.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=witchcraft+from+the+inside+raymond+buckland+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_off0000d7e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7E3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000effa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFFA 11324 bytes
SHA-256: 40a2c5d7108cd6e1b5bde88c1c33bdfa1cec7756dc630623c80479eae13cf113
font_02_sfnt_off00010a41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A41 18464 bytes
SHA-256: 9397090defe0f341d826f7087931a22f81e4a10f9d30324bb8e00b649ad6ae73