Malicious PDF — malware analysis report

Static analysis result for SHA-256 f35554c86c3c385e…

MALICIOUS

PDF

68.9 KB Created: 2021-06-25 16:58:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 20203ae49e56d199cae1f7a6848a8ddf SHA-1: e1e7f927d1c8d65515bf11bc509a0214cfffb961 SHA-256: f35554c86c3c385ebf8e945cf0e95a6953ddf7696fb28a860ccd90ede49a811f
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a link farm, with many URLs pointing to compromised WordPress sites and other disposable hosting. The ML classifier strongly indicates maliciousness, and the heuristics identify it as a link farm designed to redirect users. The primary goal appears to be directing users to external sites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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 http://handbook.hu/upload/page/file/dexenag.pdf In PDF document text
    • http://chroscina.com/userfiles/file/guweliribuzu.pdfIn PDF document text
    • https://www.scanworld.se/wp-content/plugins/formcraft/file-upload/server/content/files/16075be2f89e48---jikelibug.pdfIn PDF document text
    • http://sllight.ru/design/img/upload/file/32688410742.pdfIn PDF document text
    • http://laulumaja.fi/ckfinder/userfiles/files/79985407851.pdfIn PDF document text
    • https://otelnamore.com/wp-content/plugins/super-forms/uploads/php/files/f188f5421e2fce8c90da7ee6f334d8eb/wineruzuzobunuvekexale.pdfIn PDF document text
    • https://rebel-guitars.com/wp-content/plugins/super-forms/uploads/php/files/15086968e30ffaebbd2294d49daa5d69/31461321476.pdfIn PDF document text
    • http://moyamoya.center/images/hand_uploaded/files/33097527666.pdfIn PDF document text
    • https://grafitpoint.ru/wp-content/plugins/super-forms/uploads/php/files/4feb4730c343255c5768ddb2d794eff3/59080013454.pdfIn PDF document text
    • http://pvsystexperts.com/wp-content/plugins/super-forms/uploads/php/files/73gik1bih07hulndm0nn6uofc6/30445544217.pdfIn PDF document text
    • http://basaritarim.net/admin/editor_resim/file/55834075044.pdfIn PDF document text
    • https://www.actionconstructionjax.com/wp-content/plugins/super-forms/uploads/php/files/c19d60e31f97c070513e12696cbdad72/bupejafujovajinigi.pdfIn PDF document text
    • https://engineeredrepinc.com/wp-content/plugins/super-forms/uploads/php/files/5e3ae4f1d04400d215008a2df85e44ee/merirupetapebevopoji.pdfIn PDF document text
    • https://www.medipratik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a70d9e1d13a---lemirufobozukijazinorawir.pdfIn PDF document text
    • http://bebelino.ru/userfiles/file/79449301739.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=pdf+converter+for+pc+free+downloadPDF 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_off0000ad73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAD73 15520 bytes
SHA-256: f44a39d19e65f7fe8890aa5c4771c54e9188694b2040a42505b2550f262482fc
font_01_sfnt_off0000d54c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD54C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ed63.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED63 10508 bytes
SHA-256: 4e24c0382fc6497ab3f31fc73720d70a6285c5e410d4a6d5060d26927b53936b

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