Malicious PDF — malware analysis report

Static analysis result for SHA-256 7e5316da4cb2ae14…

MALICIOUS

PDF

80.7 KB Created: 2021-09-02 08:15:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 2e1a9de2313189840453b949b1e9f1a2 SHA-1: bd632052b7fe1ff756e4263aac2c108c9517525d SHA-256: 7e5316da4cb2ae144ce6b883ee14b8fa61bf7defec019209ff3c80efed186aec
156 Risk Score

Malware Insights

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

The PDF contains a large number of links, many pointing to compromised WordPress installations, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly support its malicious nature. No scripts were extracted, and the document body was unreadable binary data.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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.kbstephens.com/wp-content/plugins/super-forms/uploads/php/files/85a6a6edd857afa2c7103a3fcce039e0/21016854672.pdf In PDF document text
    • http://dolphinkorea.com/files/files/7765125547.pdfIn PDF document text
    • http://smithmurdock.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ee33f19c3df---2697861080.pdfIn PDF document text
    • https://alfa-pechati.ru/wp-content/plugins/super-forms/uploads/php/files/b6d0968d1d43ad480286cd0513192131/45257087267.pdfIn PDF document text
    • https://quangcaowebsitecomvn.xemlaco.com/uploads/files/zenopinir.pdfIn PDF document text
    • https://ncfouting.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab2a20881c1---fudasakivire.pdfIn PDF document text
    • http://weingut-suppan.at/files/44630592789.pdfIn PDF document text
    • http://pamat.ro/UserFiles/file/78129899316.pdfIn PDF document text
    • http://marcelponjee.nl/ponjeefiles/file/nefunufegevarurese.pdfIn PDF document text
    • https://ngonluathan.com/images/ckeditor/files/mevinup.pdfIn PDF document text
    • http://resetimpianti.it/reset/public/file/44419471165.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e4b2c86ea57---duxumam.pdfIn PDF document text
    • http://xn--90aoa5aj.xn--p1ai/ckfinder/userfiles/files/jasurobesalu.pdfIn PDF document text
    • http://pokeocncafe.com/uploads/files/sikugiga.pdfIn PDF document text
    • https://www.baptistenhardenberg.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609b96573314c---45756263388.pdfIn PDF document text
    • http://freehajjandumrah.com/admin/admin/uploadfiles/file/86071332207.pdfIn PDF document text
    • https://www.intermediastudios.com.mx/wp-content/plugins/super-forms/uploads/php/files/3ffba517988e5e0e40e649b1f477e56d/lulowu.pdfIn PDF document text
    • http://www.everhouse.lt/wp-content/plugins/formcraft/file-upload/server/content/files/160ad6d43a00c3---xopazetejasujajobajakoj.pdfIn PDF document text
    • http://celiapopememorial.com/clients/4/45/45605e685ba8a3b32f56966823665796/File/26752339098.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=meaning+of+intervene+in+englishPDF link annotation
    • 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_off0000d652.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD652 17808 bytes
SHA-256: 9acff949bafdc7abe6e365d10680d4d8784fd9e3b2fdf2ef0e5a04a84a0aaa65
font_01_sfnt_off00010474.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10474 10552 bytes
SHA-256: 26d91859c52b6f9475c982cc3e45f59e843e484e58048f022f47a01803556f07
font_02_sfnt_off00011c79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C79 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1