Malicious PDF — malware analysis report

Static analysis result for SHA-256 415e9148f35c7267…

MALICIOUS

PDF

71.4 KB Created: 2021-07-07 00:45:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: f36597ab047bbe75d84351b638e163e6 SHA-1: b022d6cda582fc0ce7e1109663dbabfdea8fab05 SHA-256: 415e9148f35c7267439c313ad0d037f1adf1cb17c52d2590e9145d0f8f813c67
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links pointing to compromised WordPress sites, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. The document's structure and embedded URLs align with techniques used to lure victims into downloading further payloads or visiting phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://www.mclarenpress.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac1f155f412---tudamuton.pdf
    • https://www.ideaklinikkadikoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607946531645e---mojozaxudilanugimowur.pdf
    • https://www.fecomerciomg.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606d3aa66b8f8---30843066216.pdf
    • https://personalloan2u.com/wp-content/plugins/super-forms/uploads/php/files/ec4625f8e0839932b4fad613a08068bc/tidovimiwuxolumir.pdf
    • https://conexusinternational.com/ckfinder/userfiles/file/15480448236.pdf
    • https://torgradio.ru/new/files/file/fafepobiwadiwimikisut.pdf
    • http://crisismobile.com/ckfinder/userfiles/files/31037974400.pdf
    • https://bloomeng.com/uploads/wigubokupitekifasoki.pdf
    • https://atrax.hr/files/sowuxafejevojubazoru.pdf
    • https://northstarexecutivesearch.com/wp-content/plugins/super-forms/uploads/php/files/8763f06b64053954ff86405caf9d2c2e/52135810634.pdf
    • https://www.helpforbusymums.com/wp-content/plugins/super-forms/uploads/php/files/1cd19155ef6c04efdbce2ad528206e5a/21615220013.pdf
    • https://jdrum-music.com/uploads/ckfiles/files/sadevidemapej.pdf
    • http://www.nanodrywash.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a63d18300af---nolavezu.pdf
    • http://www.kzhep.in.ua/wp-content/plugins/super-forms/uploads/php/files/d43hldm1cgnolr44qnag4n2lv5/72829143215.pdf
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608e0fa05349c---6198984994.pdf
    • http://snypes.nl/img/customer//files/waguzexexemezig.pdf
    • https://mobistore.co.nz/wp-content/plugins/super-forms/uploads/php/files/c1e0b61e3a4190f44464476edf3d3c2a/19497789798.pdf
    • http://abwmarlboropike.com/uploads/files/rurimudegowemawolefoj.pdf
    • http://admio.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160bc77a2847d5---lajawupekatagaduzofolima.pdf
    • http://xn--b1agaa2anfqdp.xn--p1ai/ckfinder/userfiles/files/78589596228.pdf
    • https://too.kg/wp-content/plugins/super-forms/uploads/php/files/a925fcad850d63e02c76ed5be105413a/41983396778.pdf
    • https://kogan-photo.ru/wp-content/plugins/super-forms/uploads/php/files/249967b98fe45a40ec947ef932d2e637/tovugiso.pdf
    • https://precisionautoandac.com/wp-content/plugins/super-forms/uploads/php/files/eabb6f8e2f909e5c506de37a9d6f7164/63787728611.pdf
    • https://indacphuc.com/wp-content/plugins/super-forms/uploads/php/files/1vr3kduo6sbc732kms6vr3h85f/xijoporobirus.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=domain+and+range+of+a+tangent+function
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b835.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xB835 16792 bytes
font_01_sfnt_off0000d04c.bin
d69c41f6426c27ad06812f7182790c456ea51d2f4f56347c12bbb7996104ba5f
pdf-font-stream PDF embedded font (sfnt) at offset 0xD04C 10708 bytes
font_02_sfnt_off0000e8a1.bin
89cf3126b83230e67078f0658079c36d59698bf6084cb0aeea2df57daf331ba4
pdf-font-stream PDF embedded font (sfnt) at offset 0xE8A1 15724 bytes