Malicious PDF — malware analysis report

Static analysis result for SHA-256 c6929a06b72a548c…

MALICIOUS

PDF

74.1 KB Created: 2021-09-06 21:55:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: a1345e7776000a4e0b67f9fe22a98209 SHA-1: ee41d6e827520d6c53ccfb742814cd8f77ab038e SHA-256: c6929a06b72a548c55001b5d73d94d7ee0d670971a10e5d27250f43dcb6693af
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised websites and disposable domains, identified by heuristics like PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM and PDF_SEO_DISPOSABLE_LINK_FARM. The ML classifier and ClamAV also flagged this PDF as malicious, indicating a high likelihood of malicious intent. The primary attack pattern observed is the use of a link farm to redirect users, potentially for phishing or SEO abuse.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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 http://cmuniontravel.com/userfiles/files/68033137558.pdf In PDF document text
    • http://cz-synergy.cz/data/file/lidunan.pdfIn PDF document text
    • https://www.ideakliniksisli.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608623f38d72e---42761942822.pdfIn PDF document text
    • http://sts-logistika.ru/wp-content/plugins/super-forms/uploads/php/files/39f8fb77d10403f4b4a79b059a87e4c5/88651649559.pdfIn PDF document text
    • http://www.expertnutritionadvisor.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b4691d1b00c---damanazifinid.pdfIn PDF document text
    • https://www.tai.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1606f606372b09---novaronip.pdfIn PDF document text
    • https://birutelorasin.com/contents//files/mukitigekojetajipibuput.pdfIn PDF document text
    • http://epoxidice.ro/mm/file/detinoso.pdfIn PDF document text
    • http://haiphongcontest.com/images/files/dakuweriximumulura.pdfIn PDF document text
    • http://www.icodar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba97edb0035---94018981170.pdfIn PDF document text
    • http://indiebookoftheday.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071d60035c86---xidese.pdfIn PDF document text
    • http://thanhlapcongtykiengiang.com/upload/ck/files/dejiwamowunamixip.pdfIn PDF document text
    • http://dywin.com/uploadfile/files/28734061579.pdfIn PDF document text
    • http://portalcom-b2b.es/img/user///file/_0704644001623844081.pdfIn PDF document text
    • https://visaonline-vn.com/wp-content/plugins/super-forms/uploads/php/files/018jpg975d9m403d2v6vf5o8g5/87864963484.pdfIn PDF document text
    • https://www.geosuiteonline.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a3586c35ac7---86558502500.pdfIn PDF document text
    • https://laatjehuisweerstralen.nl/upload/file/35008931427.pdfIn PDF document text
    • http://em-mould.com/ckfinder/userfiles/files/60601087285.pdfIn PDF document text
    • https://hiddencliff.kr/FileData/ckfinder/files/20210710_53F9D36C0D913444.pdfIn PDF document text
    • https://isleo.com/i_photos/file/37766367179.pdfIn PDF document text
    • https://givemeit.ru/wp-content/plugins/super-forms/uploads/php/files/a046eb395d26edbd3fde13bff59c1c40/99594255044.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=ncert+class+10+economics+book+pdfPDF 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_off0000bc9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBC9C 17152 bytes
SHA-256: 02a7faeca7c384f2cab91647fd4fb9b56e962428a968336dab6150a4e0549b1b
font_01_sfnt_off0000e8a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8A2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000100b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100B9 11164 bytes
SHA-256: 6baff11a9033892af039f7ee3e6d85e2fbd122f3169de2e1718798f3f97125e9

Open this report in the interactive analyzer, or submit your own file for analysis.