Malicious PDF — malware analysis report

Static analysis result for SHA-256 38c18b6caacf8f74…

MALICIOUS

PDF

83.9 KB Created: 2021-09-07 23:05:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: c17836bf2470730c08c5c213bc219689 SHA-1: 416f597048033832faa061abeb17ecd8c9705099 SHA-256: 38c18b6caacf8f74e4979280aacbccb7aad348b11db9183c7f5e08e1c3e38fa6
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised WordPress sites, indicating a link farm designed to redirect users to potentially malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. The document body is heavily obfuscated and unreadable, providing no direct user-facing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://bubblesoflove.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607fb75a1b0a9---radufetusewiw.pdf
    • https://webtraffic.ch/wp-content/plugins/super-forms/uploads/php/files/3crf0d0snubjjc38arg3tl6ldd/53124348956.pdf
    • https://dipinkrishna.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bab75c05674---vanamowesabozal.pdf
    • http://bayzones.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/50284171107.pdf
    • https://completecollegestrategies.com/wp-content/plugins/super-forms/uploads/php/files/186381fdbf09aef7c2e94bfe49e87d56/vodifozigumebu.pdf
    • https://binhruamuinanobac.com/wp-content/plugins/super-forms/uploads/php/files/2qvtlvhrbblb5i48lcnndie5ri/zilixifegutufopis.pdf
    • https://grnca.org/img/files/files/dedivinozavozujaramavi.pdf
    • https://pmms-online.com/assets/file/xanituwulimir.pdf
    • http://3bbb.fr/ckeditor/upload/files/pokitufugogumuxedobimexuk.pdf
    • https://lorenzonimmigrationlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b248688fe6b---dazali.pdf
    • http://dirabrealtors.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094a321bd43e---vulobelisofora.pdf
    • https://www.peeryhotel.com/wp-content/plugins/super-forms/uploads/php/files/27fb4b7e7e1b32f245d52a55047c3f2c/31506779008.pdf
    • http://ankamet.com/userfiles/file/suzad.pdf
    • https://machnhaduong.com/images/uploads/files/59461951402.pdf
    • http://adhdadvisory.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f29b6bba67---93994813600.pdf
    • http://yuanyoujie.vip/userfiles/file/44956087650.pdf
    • http://xpressup.com/userfiles/file/sekulumodigek.pdf
    • https://hmv.ir/wp-content/plugins/formcraft/file-upload/server/content/files/1608019008c95d---96267490034.pdf
    • https://regalcabs.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160768bb734391---71434478107.pdf
    • http://www.marcelasemper.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0481399d1f---12103847582.pdf
    • http://www.lauricedale.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16073582e077c8---96783616044.pdf
    • https://inchiriereelicoptere.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160b855f18b651---43508483532.pdf
    • https://rittenhousesmiles.com/wp-content/plugins/super-forms/uploads/php/files/e9b8be4c230dd0fad3b0dc701ca0454b/2131296850.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=oracle+architecture+12c+pdf
    • 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_off0000e2e6.bin
0de8b5247b9db49669da7eff7bee7426538543fa718fefdfef5335ea72ebbae2
pdf-font-stream PDF embedded font (sfnt) at offset 0xE2E6 17704 bytes
font_01_sfnt_off0001117c.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1117C 16792 bytes
font_02_sfnt_off00012993.bin
f3c298e53ffef0dd261c8903684d23e5ee284f0aa8fc23849dbe4ca84461365e
pdf-font-stream PDF embedded font (sfnt) at offset 0x12993 10620 bytes