Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc35cb145f3367d9…

MALICIOUS

PDF

141.3 KB Created: 2021-07-01 10:37:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: ca3507fdffc0e14d90cd5d95e3a17be0 SHA-1: 7ecd93904cfd9fc61ed8b6d3810755d279bd1797 SHA-256: bc35cb145f3367d9a8601e250682300c0c4eb086573e321b25628f73c5de8307
164 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and numerous links pointing to compromised WordPress sites and disposable hosting, indicating a malicious intent to redirect users. The heuristic firings suggest this PDF is part of a link farm designed for SEO manipulation or to host phishing content, and ClamAV detected it as a phishing trojan. The embedded JavaScript likely facilitates the redirection or exploitation process.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9742

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://faxik.ru/ckfinder/userfiles/files/37013869572.pdf
    • https://ehblending.com/wp-content/plugins/super-forms/uploads/php/files/3ca075ec5c11449aa97ccef1ffc3ae45/lezufokulogitekenewitov.pdf
    • https://alihuata.com/userfiles/file/ruzomadoge.pdf
    • http://cleannshieldflorida.com/wp-content/plugins/super-forms/uploads/php/files/b2460f9f56719cfb976dccb9e9ad799c/42802853240.pdf
    • http://daehwa.info/uploaded/file/wijubet.pdf
    • https://bloomeng.com/uploads/19956866860.pdf
    • http://bluefield1966.com/clients/26642/File/25583905703.pdf
    • https://bloomeng.com/uploads/89478200104.pdf
    • http://beetsom.com/PROGRAM_FCKeditor_UserFiles/file/82955702860a90029028e3.pdf
    • https://munord.com/wp-content/plugins/super-forms/uploads/php/files/c8c5438c1b6addb840cc237576b17391/dizaxemexugodefole.pdf
    • https://www.sesc.com.ua/wp-content/plugins/super-forms/uploads/php/files/7tl58747ufod59hvum6ibl8sm7/magov.pdf
    • http://optimaglobal.net/ckupload/files/75365392481.pdf
    • https://www.hinogas.com/wp-content/plugins/super-forms/uploads/php/files/kdu9me159mdc56v1ruq2mg5ul5/zesipifonetif.pdf
    • https://nhahangbienhaitien.com/uploads/files/34712816685.pdf
    • https://earthideasawnings.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d80f80df91---jejetikerulob.pdf
    • https://alkhairi.co.uk/wp-content/plugins/super-forms/uploads/php/files/bf77e076d422aeb7555ea5eb60bbee34/72376599939.pdf
    • http://mitcostruttori.it/userfiles/files/femopuberidusitisexaromod.pdf
    • http://www.photobreak.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c8ea553c6b8---38972222020.pdf
    • http://www.miamiairportlimo.net/wp-content/plugins/formcraft/file-upload/server/content/files/1609ed2b306989---pamejaxamenimokosepot.pdf
    • http://findmealocalpainter.com/insurazon/admin/userfiles/file/waxefusizazajodevetogusox.pdf
    • https://advancedbusiness.co/wp-content/plugins/super-forms/uploads/php/files/c256944137d4691d768bd99a04ab14da/79849106148.pdf
    • https://promocionesnma.com/wp-content/plugins/super-forms/uploads/php/files/f6519bd9d8dc47f222fac39f1677e5f6/6429344969.pdf
    • http://www.fullmooneye.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071c2ffade0c---34129592854.pdf
    • http://tantos.jp/js/upload/files/90954895655.pdf
    • https://luxmarketing.agency/wp-content/plugins/super-forms/uploads/php/files/ogqugp6lbt5e0bm8hhmhe4racm/debozozobamotepajevazilo.pdf
    • http://lideparts.com/userfiles/file/1624762668.pdf
    • http://europeanprofservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad4f87cd2f5---goluzukisidezijibelobow.pdf
    • http://amwordpress.org/wp-content/plugins/formcraft/file-upload/server/content/files/160aa5e3fa7bce---luxofizofepanefedatim.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=a+minor+scale+guitar+tab
    • 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_off0001c691.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1C691 16792 bytes
font_01_sfnt_off0001dea8.bin
a162e9f28a7fb45b3e63634e650bc4e51aa940fbd0be5b9259bada644c2d15db
pdf-font-stream PDF embedded font (sfnt) at offset 0x1DEA8 10792 bytes
font_02_sfnt_off0001f785.bin
e4f3f4c449a23fc96eb1c8eed4ad1cb93bef8b29d3ee8b1b290e753a789fb668
pdf-font-stream PDF embedded font (sfnt) at offset 0x1F785 18188 bytes