Malicious PDF — malware analysis report

Static analysis result for SHA-256 add25f2cbe5ab4d7…

MALICIOUS

PDF

74.6 KB Created: 2021-09-13 17:49:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 2b97d104ba573b71402f09fbe5f565f1 SHA-1: ccbc89ebaf8316e0af120583991a34ab40bba95c SHA-256: add25f2cbe5ab4d7de48700afcc685cb55febc169e04b557a91a637c09ec3a46
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a high-confidence ML classifier and ClamAV detection. It contains numerous embedded URLs that point to compromised websites and link farms, suggesting an attempt to redirect users to malicious content. The presence of these links and the heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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 https://philabc.ru/uplcv?utm_term=glee+pilot+script+pdf PDF link annotation
    • https://www.lorenzofranzone.it/wp-content/plugins/super-forms/uploads/php/files/081b9193852f08ab73ff633e338d59c4/xodawadilaledom.pdfIn PDF document text
    • https://fetogram.ir/images/upload/files/32889999179.pdfIn PDF document text
    • https://dakotaterritorydevelopment.com/ckfinder/userfiles/files/fetasefolagewef.pdfIn PDF document text
    • https://www.wemservice.com/ckfinder/userfiles/files/rekitadozalinusexilorof.pdfIn PDF document text
    • http://geriatriccarenewjersey.com/userfiles/files/52209542066.pdfIn PDF document text
    • http://brcassociati.com/userfiles/files/levorugirogumetuleno.pdfIn PDF document text
    • http://stfurnimart.com/file_media/file_image/file/jebaruwopef.pdfIn PDF document text
    • https://dakhoathienhoa.net/images/files/munakuwunotebej.pdfIn PDF document text
    • https://samarthanamparisara.org/apadmin/uploads/userfiles/files/gaporibila.pdfIn PDF document text
    • https://thuaphatlaihoanghuy.com/uploads/files/83131266228.pdfIn PDF document text
    • https://iveducentar.com/uploads/assets/file/56040737314.pdfIn PDF document text
    • http://silver.jo/ckfinder/blanc/files/naropojisetumipo.pdfIn PDF document text
    • http://qdjshg.com/files/file/gubixegozimamomewo.pdfIn PDF document text
    • https://beaumont-residence.com/wp-content/plugins/super-forms/uploads/php/files/kkulhhsu6e51ao68tl0lib0i76/jodetewetubufurufopogukug.pdfIn PDF document text
    • http://www.kocay.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1613f5f130ee3f---18194708557.pdfIn PDF document text
    • http://zoncmswebsitebeheer.nl/files/editor/file/fiseni.pdfIn PDF document text
    • https://dadesigning.com/daduserfiles/files/pijubukojafiwezobikojaxi.pdfIn PDF document text
    • http://elfast.ru/userfiles/file/xuzobutovajobuwiki.pdfIn PDF document text
    • http://beastyenergy.com/userfiles/file/jaxatibikatope.pdfIn PDF document text
    • http://biogenetec.tw/image/files/20210911_192727.pdfIn PDF document text
    • https://matrixx.lu/images/98403723943.pdfIn PDF document text
    • https://bcbc3399.com/upload/files/fuvegir.pdfIn PDF document text
    • https://hiperaktivite.info/userfiles/files/98831329651.pdfIn PDF document text
    • 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_off0000c010.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC010 17336 bytes
SHA-256: aef21691ab8a7d050fff48867be3da102fbafc673bf3acae6255d1a2889ed189
font_01_sfnt_off0000ecdf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECDF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000104f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104F6 10388 bytes
SHA-256: 52d629d50d8359b90b34ba7309ac7f0723e7a679bbfc8bdd0650c720e8f62665