Malicious PDF — malware analysis report

Static analysis result for SHA-256 1caa2d6a651f1dff…

MALICIOUS

PDF

80.7 KB Created: 2021-08-04 16:56:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 47433c12e9df76a38f0f04be16251ef2 SHA-1: 742f37735627f3cf5b77d67cd69186e037d53d2a SHA-256: 1caa2d6a651f1dff7f6859c9e422872959a70c08f42f32617d053f5bb1f6ad01
156 Risk Score

Malware Insights

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

The file was detected by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links to compromised WordPress sites and other disposable hosting, suggesting a link farm designed to redirect users to malicious content. The PDF structure itself does not contain readable text, but the presence of external URI heuristics and compromised CMS upload links indicates a malicious intent to leverage these external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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.lightingandhvacexpo.com/wp-content/plugins/super-forms/uploads/php/files/b2eb022d10142a233f24ce90b78aa218/47812602630.pdf In PDF document text
    • http://nieruchomosci-swidnica.pl/userfiles/file/sutotuwazani.pdfIn PDF document text
    • http://www.lauricedale.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160cc40e76211a---13176948464.pdfIn PDF document text
    • https://eliteswimmingpoolsinc.com/wp-content/plugins/super-forms/uploads/php/files/t288d1ipbf3tcj48dk389nlnp4/56875412859.pdfIn PDF document text
    • https://digidatadecolombia.com/wp-content/plugins/super-forms/uploads/php/files/d2d63ebd3ab2ef7490b522f8feacd396/batojibuk.pdfIn PDF document text
    • https://www.reachcast.ca/wp-content/plugins/super-forms/uploads/php/files/4667292d988108b413a33da59eea0cf9/32934909152.pdfIn PDF document text
    • https://remoteworkerclub.com/wp-content/plugins/super-forms/uploads/php/files/14c226cee26add479e76014fcefb1725/77652458484.pdfIn PDF document text
    • https://www.olympusnorge.no/wp-content/plugins/super-forms/uploads/php/files/4et7cm12il1u09qble0ggv2gg6/nibizenofijufejonatibugum.pdfIn PDF document text
    • https://martensmgt.com/business_school/uploads/file/26483800311.pdfIn PDF document text
    • http://aftckwt.com/uploads/file/56287737236.pdfIn PDF document text
    • http://spoanalyze.com/wp-content/plugins/super-forms/uploads/php/files/51a2bb6432ead9f93138a09017efdcf5/97517558446.pdfIn PDF document text
    • http://cartolmania.it/file/xutakerumafeledofimedobeb.pdfIn PDF document text
    • http://www.aamuhsv-madisonalumni.org/files/files/10238395591.pdfIn PDF document text
    • https://ev-owners.jp/userfiles//files/27391627584.pdfIn PDF document text
    • http://dr-onesrl.com/userfiles/files/43704067307.pdfIn PDF document text
    • http://globalroomplus.com/bot/ckfinder/uf/files/sawerugifakiwitugipun.pdfIn PDF document text
    • http://rund.cz/UserFiles/File/77014062376.pdfIn PDF document text
    • http://stopasbestos.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16079251fdeb06---35450265565.pdfIn PDF document text
    • http://tycoonmedical.com/userfiles/file/73192608429.pdfIn PDF document text
    • https://ebooksweb.net/files/file/87718904804.pdfIn PDF document text
    • https://spaslask.pl/wp-content/plugins/super-forms/uploads/php/files/brrmb93egh945itm1me0dsmn62/mefaxuwurupote.pdfIn PDF document text
    • https://akemi.ro/hirek/file/pepelerifudositepexivek.pdfIn PDF document text
    • https://www.revistadefiesta.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c7aeb31ff0---pinusolu.pdfIn PDF document text
    • http://xn--e42bt3l.net/upfile/files/92098825233.pdfIn PDF document text
    • http://knshzj.com/CKEdit/upload/files/varupudomujobixerifa.pdfIn PDF document text
    • https://africanresearchcenter.com/userfiles/file/42579194571.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=complete+ielts+bands+5-6.5+student%27s+book+answersPDF 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_off0000d271.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD271 17072 bytes
SHA-256: 852086c268587b92b659739deac20820ff1f4befdf34e282c1fba21516377fef
font_01_sfnt_off0000feee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEEE 11440 bytes
SHA-256: ad3e0a4d2c1c7d162f0da83984b5ab16e0bc79cac303f07d5f2531a552f9ad74
font_02_sfnt_off000119ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119EC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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