Malicious PDF — malware analysis report

Static analysis result for SHA-256 e1b85cc89c2ccbf5…

MALICIOUS

PDF

90.0 KB Created: 2021-08-12 05:07:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-24
MD5: 48277d9c181b82d6d98fcca2a5d89b61 SHA-1: 9f3a92ef13222fe031e0db600cf8ca0d1e626c1e SHA-256: e1b85cc89c2ccbf5cc6080e4f9207feadaec3271a4c480de51379d98a6083dcb
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9937

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 http://www.aadhar-interior.com/userfiles/file/75724654624.pdf In PDF document text
    • http://llux.vn/uploads/files/89309794972.pdfIn PDF document text
    • http://szentimresiklos.hu/upload/file/kujope.pdfIn PDF document text
    • http://wrhs1967.org/clients/6/61/617565fc8afb9cc6d18abf932d248b7a/File/xanub.pdfIn PDF document text
    • http://plenar.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160a0dd76ed507---74819953045.pdfIn PDF document text
    • http://nitexprofi.cz/userfiles/file/wosinowiletivaketajeri.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/160987a4207016---27847541806.pdfIn PDF document text
    • https://www.edutechusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160882196efd72---xereweropitafidalumasa.pdfIn PDF document text
    • https://jxloanchien.com/style/postimage/file/gevobefonafamiruvofupugi.pdfIn PDF document text
    • http://appinaris.net/ckfinder/userfiles/publics/files/86991683165.pdfIn PDF document text
    • http://alvasari.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a12c64bd1e6---93543695097.pdfIn PDF document text
    • http://merklink.nl/site/data/ws/files/duwefimobuv.pdfIn PDF document text
    • http://networkinglikepro.com/ckfinder/userfiles/files/39802788354.pdfIn PDF document text
    • https://gwynharmon.com/home/gwyn/public_html/ckfinder/userfiles/files/48343651182.pdfIn PDF document text
    • https://performanceltg.com/wp-content/plugins/super-forms/uploads/php/files/fad280ba9ccb1e363449e22a62616845/29293477420.pdfIn PDF document text
    • https://freedomhypnosisnyc.com/wp-content/plugins/super-forms/uploads/php/files/d37f050afe73424bd4d4d42f81dabbf9/88441717302.pdfIn PDF document text
    • https://xlux.vn/wp-content/plugins/super-forms/uploads/php/files/7h6m7l7t67h0ab27chtp62bb9n/wibanutux.pdfIn PDF document text
    • https://www.scilights.com/wp-content/plugins/super-forms/uploads/php/files/026a0564f54496299b2a7e1449792b85/luwewilutawak.pdfIn PDF document text
    • https://lea-inc.com/wp-content/plugins/super-forms/uploads/php/files/4c07b3c462b5178bfe312c9cabb44d79/48827493295.pdfIn PDF document text
    • https://www.asahinadigital.com/wp-content/plugins/super-forms/uploads/php/files/5bhp99t4a0h0mdmeu9htq1hmas/38542347806.pdfIn PDF document text
    • http://catgarner.com/clients/873270/File/20440570434.pdfIn PDF document text
    • https://jiptv.nl/wp-content/plugins/super-forms/uploads/php/files/gduiiooq7nmingtbt42i4bt1r7/58633657923.pdfIn PDF document text
    • http://hani-bee.com/userfiles/files/voriweforaligif.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=lumber+tycoon+2+auto+farm+scriptPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e36b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE36B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fb7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB7C 16560 bytes
SHA-256: 98b33204aebc7e196005b7fb8883ba91c0a2267d9ee5560275ee3ed0197bcbbe
font_02_sfnt_off000111de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111DE 17884 bytes
SHA-256: 1b85c8f7f99b75ad6254a9e67f3eb47d6b5f7424d30795c19e8ae83463647bb5
font_03_sfnt_off00014087.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14087 11024 bytes
SHA-256: e6798af69433dec483f2cf80b68c88d860a5b7cb46edd3d212dca0005bd2614c

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