Malicious PDF — malware analysis report

Static analysis result for SHA-256 ff054d596b166ea3…

MALICIOUS

PDF

76.7 KB Created: 2021-09-23 02:08:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: e9ce209e326fd3fbf525d5a962fc2038 SHA-1: 87a7bb48011e0d4ae2f7099cc79e2ff7d5fbc58a SHA-256: ff054d596b166ea3f8ea9738a249428edb627c4d0729e928e63613400ac8ec79
156 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, suggesting a phishing or malicious redirection scheme. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution via these links. No scripts were extracted, and the document body was unreadable, limiting further analysis of specific payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9943

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 http://hz-kontejnery.cz/ckfinder/userfiles/files/84564400273.pdf In PDF document text
    • http://opalbiosciences.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613006a54b96d---21809640337.pdfIn PDF document text
    • http://ahknchem.com/upload/files/kaluziridelidexuro.pdfIn PDF document text
    • http://cascinamana.it/userfiles/file/soluxalixafudoj.pdfIn PDF document text
    • https://galaxytraining.examinationonline.com/files/51380313642.pdfIn PDF document text
    • http://www.eatvirukai.lt/uploads/files/9560421761.pdfIn PDF document text
    • https://independentmusicleague.com/wp-content/plugins/super-forms/uploads/php/files/c7bc4126fb86b07ae786e96b2a8a87f3/33323760147.pdfIn PDF document text
    • https://www.heainc.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614bb45ccb39c---lobetat.pdfIn PDF document text
    • http://daiichilogistics.com/uploads/news_file/8920287320.pdfIn PDF document text
    • http://krasneclanky.cz/uploads/kemuvupawoxat.pdfIn PDF document text
    • https://ph2020.org/ckfinder/userfiles/files/bopofutuko.pdfIn PDF document text
    • https://dm288.rs/slicice/file/nemukutidojonovepajozi.pdfIn PDF document text
    • http://ankurgroups.com/userfiles/file/25801937252.pdfIn PDF document text
    • https://ceccardolj.ro/userfiles/file/nomepopigum.pdfIn PDF document text
    • https://yoimart.com/upload/file/20210916210542.pdfIn PDF document text
    • https://neurondevelopment.org/userfiles/file/fexivovu.pdfIn PDF document text
    • http://misr-consult.com/userfiles/file/jukanisasivuvilek.pdfIn PDF document text
    • https://faktxeber.ru/resimler/files/risibitedukerubar.pdfIn PDF document text
    • https://ewms.vn/wp-content/plugins/super-forms/uploads/php/files/u1tiadm66bps7urp3vlog5eej9/26784611852.pdfIn PDF document text
    • http://vdi.vn/userfiles/file/xobizijenogedojizusuw.pdfIn PDF document text
    • http://cs-web-design.de/ablage/userfiles/files/37870613593.pdfIn PDF document text
    • https://presstone.hu/userfiles/file/liwepimopegiporoposipe.pdfIn PDF document text
    • http://gmei.lt/ckfinder/userfiles/files/82396934275.pdfIn PDF document text
    • http://richmore.kr/uploadfile/fckeditor/file/jofonuvovakovob.pdfIn PDF document text
    • http://www.specemc.ru/upload/files/24583018113.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=redmi+note+9+vs+in+note+1PDF 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_off0000c73b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC73B 17812 bytes
SHA-256: 703707a00034246578424a8650650811a7127b48d9187b97737d27086f0e63b2
font_01_sfnt_off0000f5cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5CD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010de4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DE4 10432 bytes
SHA-256: 82893a1a0218f56a037bf65aed149eddac974d65445325787038142e87a8660b