Malicious PDF — malware analysis report

Static analysis result for SHA-256 938b23e883b55a85…

MALICIOUS

PDF

80.7 KB Created: 2021-09-05 23:28:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 904daf029bc7961583e04751fc951a8c SHA-1: 2616b839ac11711095507e9f7a0d995080d51392 SHA-256: 938b23e883b55a85933790b56ee4e4b67040adb71beebd0a3d183530f5b2f8c5
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 websites that appear to be compromised CMS uploads or hosted on disposable domains, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://client-sms.com/ckfinder/userfiles/files/zeremolilobudenamova.pdf In PDF document text
    • http://garmaclima.com/uploads/ckfinder/files/jazimogotagaxo.pdfIn PDF document text
    • https://foodsafebox.com/ckfinder/userfiles/files/65136271670.pdfIn PDF document text
    • https://luxurytravel-show.com/wp-content/plugins/super-forms/uploads/php/files/2ae47e19beeed95caf6810c0f367594f/gaputexusu.pdfIn PDF document text
    • https://angkortaxiservice.com/userfiles/file/degafatoniwa.pdfIn PDF document text
    • http://hart-metale.pl/gimnazjum/userfiles/file/41147739070.pdfIn PDF document text
    • http://mgocsm.in/userfiles/file/kodanag.pdfIn PDF document text
    • http://baanpowertrain.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f839aeb3d16---24406896598.pdfIn PDF document text
    • http://www.kmclogistics.com/wp-content/plugins/super-forms/uploads/php/files/ab6bea9ef3e361a68bc935f91f025e85/bivagoxowabejojigovikij.pdfIn PDF document text
    • http://aivieksteslaivas.lv/userfiles/file/welaro.pdfIn PDF document text
    • http://www.bridalchapel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2e2df09f33---95228992391.pdfIn PDF document text
    • http://lobi.md/userfiles/file/73100488890.pdfIn PDF document text
    • http://bioaec.com/userfiles/files/buposufulaxurorezurun.pdfIn PDF document text
    • http://apsons.eu/files/file/21655672430.pdfIn PDF document text
    • https://1sis.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d04a6127c7---44825559846.pdfIn PDF document text
    • http://diagonal.org.ar/wp-content/plugins/formcraft/file-upload/server/content/files/160875e8202fca---doralulezebegos.pdfIn PDF document text
    • http://archinfo.ru/uploads/file/vakozaxipasukigure.pdfIn PDF document text
    • https://sklepbonus.eu/userfiles/file/76910083156.pdfIn PDF document text
    • http://adveotec.com/img/file/zotalatanudedakela.pdfIn PDF document text
    • https://www.vigo.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1608db6707051a---88954051134.pdfIn PDF document text
    • http://hp-cnc.de/uploads/files/tuwuvuvipesamepunoka.pdfIn PDF document text
    • http://clingac.com/d/files/kewasu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=number+4+worksheets+for+preschoolersPDF 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_off0000d74d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD74D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ef5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF5F 17360 bytes
SHA-256: 6efa59e0c8b8ef47f4c6b6d193e3313a6a92b102db2f92f9b37aed1762dfd513
font_02_sfnt_off00011bf8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BF8 10860 bytes
SHA-256: 19858b2d6a61ab977d5e385757852af7a755f32c059f38aed7e1a73093934843