Malicious PDF — malware analysis report

Static analysis result for SHA-256 e2676450b69052c9…

MALICIOUS

PDF

92.6 KB Created: 2021-07-15 20:06:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 3c01e325c97da634a1034cc48a5837d2 SHA-1: 07b58bbe731685233eb5d2f3a2b0e0f3dd120a88 SHA-256: e2676450b69052c95ed2e6c1d9152b6e1db8fce8087eda713232a01f9a8686a9
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress upload directories, indicating a link farm designed to host and distribute malicious files. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware distribution. The document body is unreadable, but the heuristics and URLs clearly point to a malicious link distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9822

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://clearlakesd.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609a2b109c9e5---kurumimufefeximimepepipij.pdf In PDF document text
    • http://dienmaythanglong.org/uploads/files/demeba.pdfIn PDF document text
    • http://www.realisthotel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084c5fad2f70---18012938412.pdfIn PDF document text
    • https://netlandschool.cl/files/gixagateva.pdfIn PDF document text
    • http://westernstudioservice.com/admin/userfiles/file/nurejitutipenesukafagaga.pdfIn PDF document text
    • http://xn----8sbnbd9chja.xn--p1ai/userfiles/file/terowegimipewaxiwobab.pdfIn PDF document text
    • https://www.businesswatchguardingservices.co.uk/wp-content/plugins/super-forms/uploads/php/files/djr3iicqbgdsl1j6rsp9mjn9vu/fafoz.pdfIn PDF document text
    • https://waelfawzy.com/userfiles/file/In PDF document text
    • http://aerotechgroup.ru/img/outer/files/94664907582.pdfIn PDF document text
    • https://www.revistadefiesta.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bfa7492204d---tuvutozixuberikoxovus.pdfIn PDF document text
    • http://amuseonline.com/absite/userfiles/file/85439829651.pdfIn PDF document text
    • https://refundsrefunds.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a426e2af089---72308261376.pdfIn PDF document text
    • https://www.adelaarenergy.com/wp-content/plugins/super-forms/uploads/php/files/jeolluc3sjikv67hq7gpsn0smn/wixanuwamexilij.pdfIn PDF document text
    • https://genegurumiraclehealer.com/userfiles/file/50714480120.pdfIn PDF document text
    • https://extremetour74.ru/wp-content/plugins/super-forms/uploads/php/files/db540577071e3247e991c908624a519f/dolexowanowawosu.pdfIn PDF document text
    • http://www.lauricedale.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160ae412c74a5c---65482290435.pdfIn PDF document text
    • https://vydavatelstvoklett.sk/userfiles/file/xawuvolazajo.pdfIn PDF document text
    • https://lion-trading.co.uk/wp-content/plugins/super-forms/uploads/php/files/s6fjn7k15b6g32p46nctjlb58t/37900184332.pdfIn PDF document text
    • https://avantkart.com/wp-content/plugins/super-forms/uploads/php/files/l6m4ggoahbn14v3ehqacq8c624/34691114299.pdfIn PDF document text
    • http://tutek.eu/userfiles/file/xolojafifusovoruno.pdfIn PDF document text
    • https://orrizon.ru/images/file/86933253780.pdfIn PDF document text
    • http://www.gainerwindows.ca/wp-content/plugins/super-forms/uploads/php/files/ost7tb9n1c80ehr89cfrunepa1/ninogupeg.pdfIn PDF document text
    • http://abwingsva.com/uploads/files/pirizelewoviwitazavi.pdfIn PDF document text
    • https://www.corridar.com/wp-content/plugins/super-forms/uploads/php/files/8pf937vqas38smtf0eqrtnbkdp/vibixinaxukuvubopo.pdfIn PDF document text
    • https://uniontend.com/userfiles/files/37069141183.pdfIn PDF document text
    • https://homeaestheticsllc.com/wp-content/plugins/super-forms/uploads/php/files/fc01e5107685bb976dbeb2af37e468e3/29616253170.pdfIn PDF document text
    • https://www.limratechnologies.net/wp-content/plugins/formcraft/file-upload/server/content/files/160d217d7be005---7778117530.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=generic+structure+of+cinderella+storyPDF 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_off0001060b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1060B 17856 bytes
SHA-256: 995210867e86542aea9aeff82662400f0a1f1bbb56576f771e03e490f7b53375
font_01_sfnt_off000133f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x133F7 10720 bytes
SHA-256: cdadb2c7e7559a3f919fad6633a76177096dc4381eca3919ba3b54dda0afd756
font_02_sfnt_off00014cce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14CCE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1