Malicious PDF — malware analysis report

Static analysis result for SHA-256 be34eb8678742269…

MALICIOUS

PDF

91.8 KB Created: 2021-06-26 18:37:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 0dd496c6374166a7caed7f9a8562f77f SHA-1: f2824b0dce5e4a1136d58fd4c050ad309e0c6f62 SHA-256: be34eb867874226951794af484e59fda70974da9944ccc2fdd4fe5c65631b73b
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to multiple domains, some of which are identified as compromised CMS uploads or disposable hosting, suggesting an attempt to distribute malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery. Although no scripts were directly extracted, the PDF structure and URL patterns are consistent with techniques used to host and distribute malicious files.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 7

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://loctra.net/userfiles/file/kovelubo.pdf
    • https://babamore.com/upload/ckfinder_temp/files/20210619135230.pdf
    • https://tamtam.com.ua/wp-content/plugins/super-forms/uploads/php/files/e878453ed7c66ba3664bde7a324bc360/23149496044.pdf
    • http://oryginalnedekoracje.pl/userfiles/file/86810183678.pdf
    • https://www.tunnel.de/files/uploaded/file/53419799088.pdf
    • https://internationalmedia.com/userfiles/file/44564611311.pdf
    • http://svs-pm.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3515067c71---39714975495.pdf
    • http://edwardfmcgintypa.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/19616624776.pdf
    • http://colorfulmedia.de/fotki/fotki/file/18375989695.pdf
    • http://conwaychristian.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607a4de025a2d---luzumizawedoda.pdf
    • http://nek.ua/wp-content/plugins/formcraft/file-upload/server/content/files/1608947e01b7f1---42750509598.pdf
    • https://nikken-engineer.jp/export/sd205/www/jp/r/e/gmoserver/8/6/sd0748886/nikken-engineer.jp/fckeditor/upload/file/netixuda.pdf
    • https://gmonlinestore.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e75714f629---77061922329.pdf
    • http://project-lovcen.me/userfiles/file/22471035036.pdf
    • https://realimpacto.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160ade25a49562---famixixufovoviga.pdf
    • https://coachtourbusrental.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9cf34dc938---vunidimuwelesazilosexij.pdf
    • https://plumcourse.com/wp-content/plugins/super-forms/uploads/php/files/383844a2e487e9354350fd684ee4d247/6832610445.pdf
    • https://carsen.sk/editor_uploads/system/files/salijojamepu.pdf
    • http://ganan10.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1606d991fa57ed---71174360923.pdf
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/32613978276.pdf
    • https://halobysciton.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d507e07f51---jaxosozijobulaxusomifu.pdf
    • https://noukos.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160ae81d7669ad---nudixol.pdf
    • http://huntland.hu/upload/file/74307856399.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=squadron+officer+school+study+guide
    • 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_off00010517.bin
d17cec03043694efb6535e4b2f33b9008a06458a36800b8d360968dc40b67ced
pdf-font-stream PDF embedded font (sfnt) at offset 0x10517 11192 bytes
font_01_sfnt_off00011eb7.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11EB7 16792 bytes
font_02_sfnt_off000136c9.bin
f740995c403f04808c1dff5a15b2488973a3ad3d1ad90bde74e994b550a37ef6
pdf-font-stream PDF embedded font (sfnt) at offset 0x136C9 16720 bytes