Malicious PDF — malware analysis report

Static analysis result for SHA-256 1cdef3b8c35ae106…

MALICIOUS

PDF

76.8 KB Created: 2021-07-05 14:46:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: df16645ada33444a345f31232a2a54da SHA-1: 9c272e06324cadca3fb952a5c2cb2698513e9a5a SHA-256: 1cdef3b8c35ae10630c1d58adac93a51b601c2a009c2cd437ec1451ea626a70a
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for executing malicious code within documents. It also features a link farm pointing to multiple external URLs, including one hosted on what appears to be compromised WordPress upload storage. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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 http://ophtalmic-overnight.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160a29b2fb05db---56357276885.pdf
    • https://avonsteel.com/UserFiles/file/wejujoxarigarumurewolaju.pdf
    • https://newtop-eg.com/userfiles/file/18728951330.pdf
    • https://118highschool.am/wp-content/plugins/super-forms/uploads/php/files/62f9fd47a12950d7ea8cd791f290af54/48119242166.pdf
    • https://www.idahomedia.com/wp-content/plugins/super-forms/uploads/php/files/737fdee7201d63a99ff37cca90459078/zabesibawudoregukijabuj.pdf
    • http://adabaskimerkezi.com/upload/file/mokosijudox.pdf
    • https://kuechentreff-schmid.de/wp-content/plugins/super-forms/uploads/php/files/t7a8tg6bjor74ai6ol0u2qh3nn/duvijawusojetininorim.pdf
    • http://webcertain.net/contentupload/fckeditorUploads/organization_/file/donavutiropinuruwitonake.pdf
    • https://china-glass-mosaic.com/userfiles/files/20210605_133316.pdf
    • http://evergreendentistryva.com/app/webroot/js/ckfinder/userfiles/files/nidajikudira.pdf
    • http://www.look4job.gr/images/_user_na/file/77529036750.pdf
    • https://www.bocamvigliesrooms.com/wp-content/plugins/super-forms/uploads/php/files/f1ed13ca91a5186c5b8754e6377aa0c6/11880535156.pdf
    • http://files.ibiza-ferien.de/file/29317573595.pdf
    • https://extremetour74.ru/wp-content/plugins/super-forms/uploads/php/files/f052d5303f5c2afb140a9119e23e8dca/80131654685.pdf
    • http://pospatrans.cz/UserFiles/File/47502010259.pdf
    • http://goteneplast.se/files/images/file/fajirano.pdf
    • https://uniontend.com/userfiles/files/84079951784.pdf
    • https://jbdclothiers.net/emailer/userfiles/file/64030056265.pdf
    • https://ewastexperts.com/userfiles/files/kimabufunepunu.pdf
    • http://airconbank.com/upload/fckeditor/file/44379208463.pdf
    • https://swotin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d08dd8a2564---bepebubenopaseza.pdf
    • https://prana.video/wp-content/plugins/super-forms/uploads/php/files/nav9dm1ucfic51qd560jgb4htp/vokuxagutejevevamuvuf.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=acquitted+meaning+in+gujarati
    • 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_off0000c992.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xC992 16792 bytes
font_01_sfnt_off0000e1a9.bin
c86e5a59175e9e4c039f43730bed2cfb69c664ae51645af580f26d11e3ab3179
pdf-font-stream PDF embedded font (sfnt) at offset 0xE1A9 10736 bytes
font_02_sfnt_off0000f9c5.bin
a7f5174389ca1670f651ae3e7057b7d5c69733f1b1b8b9c09646c49ef446713a
pdf-font-stream PDF embedded font (sfnt) at offset 0xF9C5 17088 bytes