Malicious PDF — malware analysis report

Static analysis result for SHA-256 36fd62cec33c9485…

MALICIOUS

PDF

110.5 KB Created: 2021-08-17 08:01:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: ef154a0aaa42b8fae0782371b847faca SHA-1: f2871c1a4c078096d443a268133ac1f2b058f027 SHA-256: 36fd62cec33c9485c8c273ec5316c7a51bba372bc29489dac014fd8f6ed3658e
156 Risk Score

Malware Insights

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

This PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links pointing to compromised WordPress sites and disposable hosting, suggesting an attempt to redirect users to malicious content. The presence of these link farms indicates a likely phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/8e83540f7b2d71449d66d229ba3b8153/vasav.pdf In PDF document text
    • https://mavismanagement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac95a27e06b---68769310519.pdfIn PDF document text
    • http://apexnepaltravel.com/userfiles/file/getesuzedav.pdfIn PDF document text
    • http://aarogyamedico.com/userfiles/file/bibilufo.pdfIn PDF document text
    • https://elicopter-de-inchiriat.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16076c7ffe9811---48006857370.pdfIn PDF document text
    • http://verkoop-je-wagen.be/wp-content/plugins/formcraft/file-upload/server/content/files/160c2a55ccbd4f---5197948573.pdfIn PDF document text
    • http://craftland.de/res/wysiwyg/file/xosanojifefapemibowuwew.pdfIn PDF document text
    • http://claudiodauelsberg.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160720fe0f2269---fesapoturo.pdfIn PDF document text
    • http://cnokorea.com/userfiles/file/xizugemomitujiwisidoke.pdfIn PDF document text
    • http://megalabsrl.it/userfiles/files/32957870019.pdfIn PDF document text
    • http://stalmost.pl/userfiles/file/famaw.pdfIn PDF document text
    • https://socialchangefactory.org/wp-content/plugins/super-forms/uploads/php/files/930eb23c596d4e4644409e148cb813da/46205403911.pdfIn PDF document text
    • http://batterseataxi.com/survey/userfiles/files/57844267737.pdfIn PDF document text
    • https://marblobaths.com/app/webroot/img/files/kalimukojose.pdfIn PDF document text
    • http://eduomania.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c9cfb1df1b8---zunuzepev.pdfIn PDF document text
    • http://fcv-bo.org/data/fcv-bo/userfiles/file/85114196635.pdfIn PDF document text
    • https://www.prowallpanama.com/wp-content/plugins/super-forms/uploads/php/files/36a785a2a55ee80f1a217842df85f0a9/27622833139.pdfIn PDF document text
    • http://kompletucetnictvi.cz/files/file/64833055495.pdfIn PDF document text
    • https://tavio.ru/files/file/filajapumupimupijubikigev.pdfIn PDF document text
    • http://xn--b1ahhafccpgkb2bxo.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/807166d88435a887c71e617fb9d8b951/23729000125.pdfIn PDF document text
    • https://inchirieriavioane.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160af8959114fe---6421677033.pdfIn PDF document text
    • https://global-brand.net/userfiles/files/72894827616.pdfIn PDF document text
    • http://munsusa.org/userfiles/file/20210519154835.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=historia+de+la+iglesia+cristiana+editorial+vida+pdfPDF 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_off000145a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x145A3 19672 bytes
SHA-256: c6c86e2f537f7fed8eb1a7aa4eff0e14dd64753e9025069d2e625b09690ce2aa
font_01_sfnt_off000177d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x177D2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00018fe9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18FE9 10852 bytes
SHA-256: 11903926c047e3f6ecaad6c353d3624512bc51c623af1d1a783ca5d9915c152b

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