Malicious PDF — malware analysis report

Static analysis result for SHA-256 3f56d6084a1de4dc…

MALICIOUS

PDF

75.7 KB Created: 2021-09-01 13:02:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: 6cd07202505488e29fd63a7b2a999251 SHA-1: ce4894acc28403f8c23dd6bdb526e6fe2509b3e3 SHA-256: 3f56d6084a1de4dce48d0b765dc4a8f56d9b78430860f1eed8cfaf15164bee59
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains embedded JavaScript and a large number of external URIs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of embedded JavaScript indicates potential for further malicious actions, such as downloading additional payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://coretry.ru/uplcv?utm_term=arc+length+and+radian+measure+worksheet+answer+key PDF link annotation
    • http://ottotech.center/userfiles/file/42272164771.pdfIn PDF document text
    • http://ceskylakros.cz/userfiles/file/88636433605.pdfIn PDF document text
    • https://digireg.com/upload/82611640411.pdfIn PDF document text
    • https://catequesisnavarra.org/guiarte_userfiles/files/buxedafotamunogoledajikek.pdfIn PDF document text
    • http://designpavelzapletal.cz/files/file/donumefigetekexip.pdfIn PDF document text
    • https://higher-reason.com/wp-content/plugins/super-forms/uploads/php/files/1fhv7tui87n48n3jj54evgkp80/40844885875.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a24d65393c.pdfIn PDF document text
    • https://doitsolutions.co/wp-content/plugins/super-forms/uploads/php/files/219d58b6be8d352a0f45e9e2389180b4/jokovev.pdfIn PDF document text
    • https://shotclock.ca/wp-content/plugins/super-forms/uploads/php/files/e9d43a4d51674c918fb8b2b464b222d2/76686798051.pdfIn PDF document text
    • http://idolyokocho.com/js/ckfinder/userfiles/files/sesokazeten.pdfIn PDF document text
    • https://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/902af64b8a6d02761228b76ce0e805d0/51211715536.pdfIn PDF document text
    • http://fireprovietnam.net/luutru/files/befevivugupegake.pdfIn PDF document text
    • http://cyklo-sport-servis.cz/UserFiles/File/radurepapolivivu.pdfIn PDF document text
    • http://anhuicrew.com/upload_fck/file/2021-6-27/20210627184449133997.pdfIn PDF document text
    • https://www.espymetcalf.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082d2bcbbddf---70965014415.pdfIn PDF document text
    • http://sushikyototogo.com/uploads/files/23907766335.pdfIn PDF document text
    • https://postscriptproductions.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f0d55a1757---muwawesopunamop.pdfIn PDF document text
    • https://greyquotient.com/wp-content/plugins/super-forms/uploads/php/files/226fac245c32d3c91180b5e83ee29da6/rokopevadog.pdfIn PDF document text
    • http://ventilatoryzlin.cz/images/file/76404322402.pdfIn PDF document text
    • https://www.espymetcalf.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b4a6b2bc4d0---78317539545.pdfIn PDF document text
    • https://thesmithgrouphouston.com/wp-content/plugins/super-forms/uploads/php/files/3b4b515cd51b5b3c84c1e5528961c4ff/91608345312.pdfIn PDF document text
    • https://abisspaandboutique.com/nbloom/fckuploads/file/jilusunavexan.pdfIn PDF document text
    • https://www.asahinadigital.com/wp-content/plugins/super-forms/uploads/php/files/c2175j1agb1k4qvr1qifi9e77o/dumixatorutoxawipuzugivuz.pdfIn PDF document text
    • https://traveletrust.com/basefile/traveletrustcom/files/faretobukifexakuxusixi.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_off0000c0bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC0BF 17052 bytes
SHA-256: 3c33d2178cb5e5d58eb96627d986ee5b10879dec649187a9f264d410016e1586
font_01_sfnt_off0000ec78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC78 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001048f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1048F 11188 bytes
SHA-256: a8992f0061c4f11480b5c29d1afa48991d216f4abbcf2e9076e5e5cc13de8de9

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