Malicious PDF — malware analysis report

Static analysis result for SHA-256 1878cb67b764fe59…

MALICIOUS

PDF

80.2 KB Created: 2021-09-19 08:24:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a52d4dfa3f713be9271173854bead6a2 SHA-1: 1f94ab1101d3bf6fa5ebdc829776eba1381ae291 SHA-256: 1878cb67b764fe59557db523552c9cdc0c6d8891bd5a7c3cc626d24fa31ae3f4
96 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm or redirection scheme. The ML classifier strongly flagged this PDF as malicious, and the heuristics suggest it's designed to distribute links to potentially harmful content. No scripts were extracted, but the structure and URL distribution are indicative of a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://oniceh.ru/uplcv?utm_term=best+free+wifi+password+hacking+software
    • https://santchavarabed.in/ckfinder/userfiles/files/67680121609.pdf
    • http://taiwan-casters.com/userfiles/file/sakamekonefe.pdf
    • http://tagsu.com/attachments/fckattachments/file/jusedopexoxenumaw.pdf
    • https://adikkedua.com/contents/files/votikezebelex.pdf
    • http://micdelhi.in/userfiles/file/runepubakewuwon.pdf
    • http://beijingteye.com/upload/files/sizabevotubuliresivu.pdf
    • https://cruiseship.cruises/wp-content/plugins/super-forms/uploads/php/files/iu86nheo8bgv4a18vmtgrq4neg/69756854894.pdf
    • https://echipamente-scule.ro/userfiles/file/15493092082.pdf
    • http://linpus.com/app/webroot/userfiles/files/45352532324.pdf
    • https://stvorki.ru/files/file/8499755415.pdf
    • http://bradhelferlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/96070977997.pdf
    • https://lostsoulsmemorialnj.org/wp-content/plugins/super-forms/uploads/php/files/f27aaacdcaaf4fb72972f0cfc7aa5934/pufaven.pdf
    • http://remobudostol.pl/pliki/28862712779.pdf
    • http://geologocarmignani.com/userfiles/files/zopofonabemef.pdf
    • https://kratky.eu/files/file/64891480800.pdf
    • http://jysfh.com/upload_fck/file/2021-9-1/20210901081038484431.pdf
    • https://briljant-maleri.se/UserFiles/files/jakik.pdf
    • http://terapie-psi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613dc25746609---depavewibojozafov.pdf
    • http://shipagents.nl/uploadfiles/file/resimapavatukuzadisuwaka.pdf
    • https://sasalidayanisma.org/uploads/file/94411512524.pdf
    • https://reifenscho.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613e3dfc0e41b---13339269971.pdf
    • https://dom4m.de/userfiles/files/38544456992.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_off0000d6ee.bin
a354e75f15a9c5d41a6c094fd7a2310915729d0d0986c8e021bdce56e0d45e3b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD6EE 11084 bytes
font_01_sfnt_off0000f0a4.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF0A4 16792 bytes
font_02_sfnt_off000108b6.bin
527f84637aae3a5e31f217a2a4536a8946f8b1768b0468b8e0981f1a20458163		 pdf-font-stream PDF embedded font (sfnt) at offset 0x108B6 16472 bytes

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