Malicious PDF — malware analysis report

Static analysis result for SHA-256 b3551e23b22bbaae…

MALICIOUS

PDF

74.0 KB Created: 2021-09-20 10:49:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: bfa045953d8ab0aad6346edda1840231 SHA-1: b96499e290c4995a158de3c6c2566d4d9d5147e8 SHA-256: b3551e23b22bbaaee3835ac6b3a80168c30bd5731a8f17736688e11b44b37e9c
156 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs pointing to compromised WordPress sites and other disposable hosting, suggesting a link farm designed to redirect users. The presence of these links strongly indicates a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://krisoc.ru/uplcv?utm_term=sunny+leone+very+hot PDF link annotation
    • https://angem.fr/userfiles/file/74521314020.pdfIn PDF document text
    • https://southwestlooms.com/admin/userfiles/files/wezepozejo.pdfIn PDF document text
    • https://varida-tech.com/ckfinder/userfiles/files/fesasuzavaxatemixofosu.pdfIn PDF document text
    • http://portamarioarchitetto.eu/userfiles/files/dekulisafutirib.pdfIn PDF document text
    • https://isabellepieman.com/userfiles/file/53496857817.pdfIn PDF document text
    • http://artwatch.ru/userfiles/file/38686584558.pdfIn PDF document text
    • https://festivalecolo.ca/wp-content/plugins/formcraft/file-upload/server/content/files/161311297725c2---59918834242.pdfIn PDF document text
    • http://restaurant-lyons.fr/userfiles/file/4637666963.pdfIn PDF document text
    • http://dossalas.com/wp-content/plugins/super-forms/uploads/php/files/e1797de547c28c49c190e535c8603f55/definokatikepo.pdfIn PDF document text
    • http://khaskhaan.mn/uploads/userfiles/files/wesuzabelapirukubaf.pdfIn PDF document text
    • http://sz-nuoyi.com/Upload/file/2021091917334991847.pdfIn PDF document text
    • https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/1614056eeefbb6---69461462655.pdfIn PDF document text
    • https://rmissio.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16138f8c3d9405---duvafipuwovarew.pdfIn PDF document text
    • http://htk2.altrodesign.eu/ckfinder/userfiles/files/belafukugabojudunajinow.pdfIn PDF document text
    • http://apart1day.ru/file/bigovo.pdfIn PDF document text
    • https://onderdurdu.com/upload/ckfinder/files/54920100762.pdfIn PDF document text
    • http://krzysztofmalec.pl/gfx/fck/file/87735532288.pdfIn PDF document text
    • http://egitara.com/upfiles/files/74516909382.pdfIn PDF document text
    • http://smartwealthhk.com/userfiles/3469465817.pdfIn PDF document text
    • http://mhinflatable.com/upload/file/97798136778.pdfIn PDF document text
    • http://fuhua.tumujike.com/assets/upload/files/202109180345484192.pdfIn PDF document text
    • http://myjobcareer.net/userfiles/file/2021091922010473499.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_off0000bf6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF6D 17076 bytes
SHA-256: e6d7b22549d97c0cc22f3f1789bf31fa66d6021bfe60a30925cb65d1ad23eefd
font_01_sfnt_off0000ebdc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBDC 10136 bytes
SHA-256: 988dcad2ca619b1eb354c8e88f61fd72fcc56c0cc0d3be0a49378d58496f1af5
font_02_sfnt_off0001028f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1028F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1