Malicious PDF — malware analysis report

Static analysis result for SHA-256 f28e308467a874f8…

MALICIOUS

PDF

81.1 KB Created: 2021-08-16 05:44:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 672c8e961df397eadaaca1ea4f62bf79 SHA-1: 3d7b21419e73c26944e00574992e1a477c18b169 SHA-256: f28e308467a874f8806ad7034229f078be40b1003b84a22b570832033e46c2db
156 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs that point to compromised WordPress sites, indicating a link farm designed to direct users to potentially malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. No scripts were extracted, and the document body was unreadable, so the rationale is based on the URL analysis and heuristic firings.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://dfa-finanz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a8d887607cd---zeririxadale.pdf In PDF document text
    • https://shayangroup.net/wp-content/plugins/super-forms/uploads/php/files/8472e205fdcb70f73291e418cf405d36/pogosuzuvutarom.pdfIn PDF document text
    • https://olivierdaulte.com/ckfinder/userfiles/files/sawogumemopesujukatage.pdfIn PDF document text
    • http://yuseigachi.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b4991ebbb03---46844948685.pdfIn PDF document text
    • http://wksystems.net/HotelEstimator/userfiles/file/boduvusobopoluzasike.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/16071c8f869d7d---78241470503.pdfIn PDF document text
    • http://livestreaming.group/wp-content/plugins/super-forms/uploads/php/files/2b722hmdbg421em9hbulp3bkle2v09q7/tisimipobavipobebena.pdfIn PDF document text
    • http://cameralehiep.com/hinhanh_fckeditor/file/72798063297.pdfIn PDF document text
    • http://www.northeastmarquees.com/wp-content/plugins/super-forms/uploads/php/files/ade265613d4d533b52df6c087851bf63/baxinokakunob.pdfIn PDF document text
    • http://espokebar.com/uploads/files/zurifovowod.pdfIn PDF document text
    • https://watosaphotography.com/app/webroot/userfiles/files/20210815_002002.pdfIn PDF document text
    • https://gancza-yacht.pl/userfiles/file/munetipakobel.pdfIn PDF document text
    • http://caacoding.net/wp-content/plugins/formcraft/file-upload/server/content/files/16079ea651a6aa---15737225692.pdfIn PDF document text
    • http://biosafety.biz/ckfinder/userfiles/files/55074937508.pdfIn PDF document text
    • https://banktapeunadana.com/tapeunadana/bank2/admin/userfiles/file/94466965368.pdfIn PDF document text
    • https://devismesport.fr/userfiles/file/9716610543.pdfIn PDF document text
    • http://f-kcc.jp/user_data/userfiles/files/zusuvajusano.pdfIn PDF document text
    • https://pabausa.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a346828f163---losisakaluxexoxiferi.pdfIn PDF document text
    • http://angarakshaksecurity.com/userfiles/file/gozewenajulototu.pdfIn PDF document text
    • https://www.pennlighting.com/wp-content/plugins/super-forms/uploads/php/files/21140dcf3e30dfd6adfed5e210b0d4bd/zuvudakalitinewujijatata.pdfIn PDF document text
    • https://audreyheselmans.com/_files/file/36661968598.pdfIn PDF document text
    • https://www.travelticket.com.au/wp-content/plugins/super-forms/uploads/php/files/ocdrd6fc9t6igt6k31pah9gho9/71958253231.pdfIn PDF document text
    • https://www.actionconstructionjax.com/wp-content/plugins/super-forms/uploads/php/files/f4f89672500b2fed43ca416c951a5216/samomid.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=duvaltaxcollect.net+tag+renewalPDF 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_off0000d6a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6A6 10564 bytes
SHA-256: 4d304ec9084c84d2507a7fd2de86ce59b59f8f59b5fa847fa3b8cac1fe9e7f82
font_01_sfnt_off0000ef07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF07 17580 bytes
SHA-256: 2360b0841112d7278d05fec5c2096d0314179101319a78a731face89bf1ea785
font_02_sfnt_off00011d19.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D19 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1