Malicious PDF — malware analysis report

Static analysis result for SHA-256 aa8f9ee6a39713a5…

MALICIOUS

PDF

82.3 KB Created: 2021-09-12 12:32:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: bc2036af8b1f88b1c7e3c934c5a5d517 SHA-1: 3d2620432100c3759d0e3e675d25df8fd7edaa4e SHA-256: aa8f9ee6a39713a56c46826fe3021ddf0723299744b9f15dcc6486dacf91904b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as a malicious PDF by ClamAV and an ML classifier. It contains numerous links to external websites, many hosted on compromised WordPress sites or disposable domains, suggesting a link farm or phishing lure. The presence of embedded URLs and the overall structure indicate an attempt to redirect users to malicious sites, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://nomylo.ru/uplcv?utm_term=install+google+play+store+app+for+android+tablet PDF link annotation
    • https://vaynhanh365.net/contents/files/65211712216.pdfIn PDF document text
    • http://gleb777.com/fck_upload/file/jojilaxizoruvev.pdfIn PDF document text
    • https://www.corpeverest.com/ckfinder/userfiles/files/17848891366.pdfIn PDF document text
    • https://sirikulsteel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613281b9893af---62611510123.pdfIn PDF document text
    • https://brianhigbielaw.com/UserFiles/file/xofefo.pdfIn PDF document text
    • https://kemxoithanhhang.vn/app/webroot/files/images/pages/files/lisire.pdfIn PDF document text
    • http://abwhopewell.com/uploads/files/56862041289.pdfIn PDF document text
    • https://www.emmabowman.com/wp-content/plugins/super-forms/uploads/php/files/3d84bc6b4c26f326214219ea71370012/zemumad.pdfIn PDF document text
    • https://lrdreamteam.com/files/files/file/InfoProduct/file/ligerafimuto.pdfIn PDF document text
    • http://aydinservis.com/ckfinder/userfiles/files/49814757314.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/uaavj279e3km9mmcd15d2d5q24/kamugovotavuwunaba.pdfIn PDF document text
    • http://siltherm.com/ckfinder/userfiles/files/pevenodusefakidoti.pdfIn PDF document text
    • http://qianxi.cn/filespath/files/20210912081750.pdfIn PDF document text
    • http://aranykoronakft.hu/userfiles/file/jilazoliporejifofiwerizob.pdfIn PDF document text
    • http://xyr59.com/filespath/files/20210902052800.pdfIn PDF document text
    • https://radekslodkiewicz.pl/files/file/64305834484.pdfIn PDF document text
    • http://nppgursaraijhansi.in/ckfinder/userfiles/files/baxapigaxafadow.pdfIn PDF document text
    • http://maristaslardero.es/userfiles/file/bogukomolapobemedadutogeb.pdfIn PDF document text
    • https://adesso-moosburg.de/images/file/sovegesisatinux.pdfIn PDF document text
    • http://freehajjandumrah.com/admin/admin/uploadfiles/file/bowetirukokesadajev.pdfIn PDF document text
    • http://portaldeaquidauana.com.br/ckfinder/userfiles/files/diwamodubelawi.pdfIn PDF document text
    • http://jiin-torng.com/uploadfiles/20210908181039.pdfIn PDF document text
    • http://dinskayarealty.ru/media/file/duwemisovor.pdfIn PDF document text
    • http://axi-hohenstein.de/userfiles/file/tifuporo.pdfIn PDF document text
    • https://www.audifonosdoshoydos.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136f1e79a1d0---92277161921.pdfIn PDF document text
    • https://monarchwinemerchants.com/wp-content/plugins/super-forms/uploads/php/files/85e9ee63edfb145830f42a9d336bd774/tevibekorawamosozifiwabep.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_off0000dc71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC71 17756 bytes
SHA-256: d8e3b3d7703b316417aa646778761f7822ac12a8f008702cbd68ae388d9f29b3
font_01_sfnt_off000109e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109E0 10880 bytes
SHA-256: f68bdce14f936fa8b88543b8782cb810b0cbe74b0a15cef34b8e58a98759b1ce
font_02_sfnt_off000122b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122B8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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