Malicious PDF — malware analysis report

Static analysis result for SHA-256 36f73862612010d9…

MALICIOUS

PDF

82.8 KB Created: 2021-07-09 03:09:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 277755a3285cad29578456c68a5bf267 SHA-1: 6b098684d14fe045517145499481c2673f521b57 SHA-256: 36f73862612010d97a3dfa294f0439da57d00aa85e1773d2205c227dc59506a0
96 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many pointing to compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content or for SEO abuse. The ML classifier strongly indicates maliciousness, and the presence of external URIs and link farms points towards a phishing or redirection attack vector. No scripts were extracted, but the overall structure and URL patterns are indicative of a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

Heuristics 5

  • 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://drafthe.ru/uplcv?utm_term=how+to+write+text+on+image+in+word PDF link annotation
    • https://qamarapps.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d6a7c261eea---ruxaxezegaxatefax.pdfIn PDF document text
    • http://tomnhenryanderson.com/clients/8/8a/8a1068334c160bb49438aafe8043afff/File/jonid.pdfIn PDF document text
    • http://www.pilonidalsinus.gen.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16070010b3c4f6---sobabowibodulabor.pdfIn PDF document text
    • https://kamber.dk/wp-content/plugins/super-forms/uploads/php/files/90abf6ca9e7bbfea70836fc7536549cc/vabiwizegirokenaleviguf.pdfIn PDF document text
    • https://pikewallis.no/wp-content/plugins/formcraft/file-upload/server/content/files/16085aa8b1376c---58670100952.pdfIn PDF document text
    • http://sgyscom.com/upload_fck/file/2021-6-27/20210627173011820174.pdfIn PDF document text
    • http://kibbkw.com/uploads/file/85447213692.pdfIn PDF document text
    • https://dewalt-naradi.cz/media/upload/editor/file/68418762480.pdfIn PDF document text
    • http://capital96.com/userfiles/file/xeniza.pdfIn PDF document text
    • http://occahomesearch.com/userfiles/files/87611864821.pdfIn PDF document text
    • https://shinyjewellers.com/wp-content/plugins/super-forms/uploads/php/files/55an9f7mave9p0rf9tt22s17li/wusadojinilagi.pdfIn PDF document text
    • http://reszke.pl/fckeditor/editor/filemanager/connectors/php/file/makobiziti.pdfIn PDF document text
    • http://allamericannursing.com/userfiles/file/61301794164.pdfIn PDF document text
    • http://chagatea.ru/wp-content/plugins/super-forms/uploads/php/files/fe26d78e80aac07876ff334c3080c71a/mojadatidebiparin.pdfIn PDF document text
    • http://katyababash.com/images/uploads/file/88894274298.pdfIn PDF document text
    • https://1sis.com/wp-content/plugins/formcraft/file-upload/server/content/files/160713ee5af527---76752972813.pdfIn PDF document text
    • http://drironcat.com/images/file/71449842437.pdfIn PDF document text
    • https://victory-agency.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089d7b32abb3---63235143478.pdfIn PDF document text
    • https://georgiamusicpartners.org/wp-content/plugins/super-forms/uploads/php/files/7363aa61ae00b7b3e55417a817753e25/46464630647.pdfIn PDF document text
    • http://royalgroup.at/tmp/gobajugenovowuxafofewuw.pdfIn PDF document text
    • https://hansenlight.com/UploadFile/files/40315732983.pdfIn PDF document text
    • http://alexlunacoach.com/img/editor/file/33151342593.pdfIn PDF document text
    • https://nikken-engineer.jp/export/sd205/www/jp/r/e/gmoserver/8/6/sd0748886/nikken-engineer.jp/fckeditor/upload/file/gadudofoxuropaposafivud.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_off0000e280.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE280 16764 bytes
SHA-256: bc68b2ca857f5420478d69be858265e43bc28131f4e3795abffd14f7a21d6944
font_01_sfnt_off00010e22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E22 10556 bytes
SHA-256: bac6136cc5b5249ca312e2bec9173d7a36e0e5d767d7b1e8dace34e4ce321a9f
font_02_sfnt_off000125f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125F9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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