Malicious PDF — malware analysis report

Static analysis result for SHA-256 16ab6ee88aa2eb2c…

MALICIOUS

PDF

78.5 KB Created: 2021-09-06 21:05:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 5eca49546304966a3d8b0ffd38d3ffb3 SHA-1: ddd8f337774c3aa7a3d0469ca153850f04fe6680 SHA-256: 16ab6ee88aa2eb2c0fc651b7c29b5e54b0a8f229d5fc29c7c4367915ed43148b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many hosted on compromised WordPress sites, suggesting a phishing or malware distribution campaign. The 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' heuristics indicate a deliberate attempt to create a link farm for SEO manipulation or to host malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or delivering a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://garglob.ru/uplcv?utm_term=convertidor+de+word+a+pdf+online+free PDF link annotation
    • https://betonwerkendejonge.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160f2f851e5744---xeluduvowaliketonunufev.pdfIn PDF document text
    • http://majortaylorride.info/images/uploaded/file/2640223361.pdfIn PDF document text
    • https://www.ezhealthcheck.com/wp-content/plugins/super-forms/uploads/php/files/3k2dsbeb4lbs9ps1qq10eq38t4/68600115727.pdfIn PDF document text
    • http://akbmodel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608cd24ab8d87---94045537571.pdfIn PDF document text
    • http://caribsplash.org/wp-content/plugins/formcraft/file-upload/server/content/files/160bc7de12406a---jewimotegumurobi.pdfIn PDF document text
    • https://sharmtocairo.com/userfiles/files/82797001443.pdfIn PDF document text
    • https://osakaav.com/userfiles/files/wekolozusowupokutulazete.pdfIn PDF document text
    • http://rigassprotes.lv/uploadz/file/44051940050.pdfIn PDF document text
    • http://thanhlamresort.vn/wp-content/plugins/formcraft/file-upload/server/content/files/160b2158776d1d---zolaborisajowuparimatuli.pdfIn PDF document text
    • https://rdw-wolf.de/backend/ckfinder/userfiles/files/morutebezuwikigep.pdfIn PDF document text
    • https://www.sanier.pl/wp-content/plugins/super-forms/uploads/php/files/vsssesdm08esn0f8m17vsrgt8l/8652257659.pdfIn PDF document text
    • http://constantcontinuity.com/membership/data//files/baponikosezejapalus.pdfIn PDF document text
    • http://3duct.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612038616e5b7---64264160912.pdfIn PDF document text
    • http://reguitti-engineering.it/userfiles/files/31563946361.pdfIn PDF document text
    • http://thefutureofgolf.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1609608ebcf55b---rilaxozitoluvupilixupu.pdfIn PDF document text
    • https://webupdate.ca/wp-content/plugins/super-forms/uploads/php/files/pc3cfeievrbfdsud46tddmultb/39731594088.pdfIn PDF document text
    • https://www.kiteschule-kiel.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ae0ba0472ca---lorotolaxamarized.pdfIn PDF document text
    • http://dd-eng.com/files/files/gusuzorum.pdfIn PDF document text
    • https://www.pferde-fuer-unsere-kinder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b510b5e634b---62892553439.pdfIn PDF document text
    • http://www.johnknox.ch/wp-content/plugins/formcraft/file-upload/server/content/files/16104894eee04d---55976440048.pdfIn PDF document text
    • http://abwlondonblvd.com/uploads/files/senunovug.pdfIn PDF document text
    • http://brenna-ski.pl/userfiles/file/894085503.pdfIn PDF document text
    • http://ptk-astana.kz/wp-content/plugins/super-forms/uploads/php/files/ff2b40f966e3f8e33997dd0a20e477f6/35755945886.pdfIn PDF document text
    • https://antoinepanau.com/wp-content/plugins/super-forms/uploads/php/files/40ab0ef580280d6e06b5aa24a9610f84/26893729696.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_off0000cdbb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDBB 17720 bytes
SHA-256: 3069c303385377c0cbc8773456fc8050626191116bac8a1b6da294735f30eb5a
font_01_sfnt_off0000fbcc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBCC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000113e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113E3 10508 bytes
SHA-256: f8d0f0a3371ef026752f227e3087c31c74c8b868839cfc4b1a2c5d32cead0f51

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