Malicious PDF — malware analysis report

Static analysis result for SHA-256 9c211b8b225180c4…

MALICIOUS

PDF

81.5 KB Created: 2021-09-19 21:51:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 0c36f67fc61699fb8fc42a6186afa7ad SHA-1: 878c8174f8e53abcab18c0b9b897845de4796a2a SHA-256: 9c211b8b225180c4cf00615fc4fa98a13448bdeed0636ad7a9ac73c2619b9438
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to distribute malicious content or phish users. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://ketchas.ru/uplcv?utm_term=calorie+app+android PDF link annotation
    • http://bretagne.annuaire-regional.com/ckfinder/userfiles/files/simuwoxajusaxeje.pdfIn PDF document text
    • http://www.expertnutritionadvisor.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135ad72e3956---vasavorubotufus.pdfIn PDF document text
    • http://sorokolaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/41747555762.pdfIn PDF document text
    • http://kawana.tech/userfiles/file/jazujuzikov.pdfIn PDF document text
    • http://mgbig.com/upload_fck/file/2021-9-19/20210919123700177907.pdfIn PDF document text
    • http://scuolascifondocortinadolomiti.it/userfiles/files/kigatufuwun.pdfIn PDF document text
    • http://gapoom.com/upload/fckeditor/file/42571921654.pdfIn PDF document text
    • http://omni-links.com/images/blog/file/55666354330.pdfIn PDF document text
    • http://vibestedu.com/_UploadFile/Images/file/16814821452.pdfIn PDF document text
    • http://bridgesonthepark.com/wp-content/plugins/formcraft/file-upload/server/content/files/16145d89f968f6---lusupimefuvimokujag.pdfIn PDF document text
    • http://ms-krmelin.cz/app/webroot/files/files/xedevuluxiru.pdfIn PDF document text
    • http://gzwep.com/img/file/202191820432.pdfIn PDF document text
    • https://griby.biz/ckfinder/userfiles/files/fanafarojaxezal.pdfIn PDF document text
    • http://lnhaihui.com/userfiles/file/20210902010838_371350852.pdfIn PDF document text
    • http://inkjetartandimage.com/Uploads/file/47514762537.pdfIn PDF document text
    • http://noclegsosnowiec.pl/eurostyl/photos/file/82554855515.pdfIn PDF document text
    • http://medica-eg.com/userfiles/file/95421780786.pdfIn PDF document text
    • https://amadesafar.ir/basefile/amadesafarir/files/51345296564.pdfIn PDF document text
    • https://vmkstroi.ru/wp-content/plugins/super-forms/uploads/php/files/0174604ed497a84d593c1525046b2c62/20555859684.pdfIn PDF document text
    • https://yukkumpulgroup2.com/contents/files/kofitoxod.pdfIn PDF document text
    • https://eclipsetheaters.com/wp-content/plugins/formcraft/file-upload/server/content/files/161469345607c2---44097095564.pdfIn PDF document text
    • http://bargiel.com.pl/ckfinder/userfiles/files/204369082.pdfIn PDF document text
    • http://hepiran.com/cache/fck_files/file/93318433101.pdfIn PDF document text
    • http://form4concrete.ru/pics/cont/file/49017112988.pdfIn PDF document text
    • http://dabaizhongxue.com/upload_fck/file/2021-9-7/20210907164612473831.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_off0000dcf4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCF4 10152 bytes
SHA-256: 626153023e6b6b32c1871c6c7173f9c1be987d9cb20032ad0aca7be7a54871bb
font_01_sfnt_off0000f3a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3A7 17388 bytes
SHA-256: 51cf424486c405d36c87b7736bbf1f27af33f91004102aee0b8889e86ffbb705
font_02_sfnt_off0001206c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1206C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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