Malicious PDF — malware analysis report

Static analysis result for SHA-256 82eb5aca223996e1…

MALICIOUS

PDF

68.9 KB Created: 2021-09-25 08:33:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 2bb848300dd4a688b7d5bf45e13647c4 SHA-1: 5bc7054927643a27599e5385efee2c94e4dcb9fb SHA-256: 82eb5aca223996e18f84f60aa48775d4f4964c0978f86908594df68ca49c2a56
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The document contains a large number of embedded URLs, many pointing to compromised WordPress sites and disposable hosting, suggesting a link farm designed to redirect users to malicious content. While no scripts were explicitly extracted, the presence of numerous external links indicates an attempt to lead the user to a secondary malicious resource, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://garglob.ru/uplcv?utm_term=super+wallpaper+miui+12+poco+f1 PDF link annotation
    • https://gamletaarnhuset.no/wp-content/plugins/formcraft/file-upload/server/content/files/1613d36657bc4d---31516633053.pdfIn PDF document text
    • http://www.centrosanmarco.eu/img/news/files/gidawaxowufukox.pdfIn PDF document text
    • https://www.kadeavenue.com/wp-content/plugins/super-forms/uploads/php/files/ebaa8731e28520074a7ec3369da14377/rabogefig.pdfIn PDF document text
    • http://taiwanquinoafamily.com/shopadmin/upload/files/44242541834.pdfIn PDF document text
    • https://kozhikodedeaf.org/admin/my_files/file/riresizena.pdfIn PDF document text
    • http://czpohledavky.cz/userfiles/files/68164271552.pdfIn PDF document text
    • http://sccsfz.org/upload/2021-09/bewug.pdfIn PDF document text
    • https://itscebu.com/upload/file/20210903024658.pdfIn PDF document text
    • https://www.fecomerciomg.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/16141d18d4d11d---sizuwudez.pdfIn PDF document text
    • http://medi-sen.com/files/files/7199706614.pdfIn PDF document text
    • http://flirdining.com/uploads/files/59830467512.pdfIn PDF document text
    • http://yh-nutri.com/filespath/files/20210920205952.pdfIn PDF document text
    • http://begues.mobi/userfiles/file/namusemum.pdfIn PDF document text
    • http://auksozvynas.lt/userfiles/file/betibalisawi.pdfIn PDF document text
    • http://xn--80ab1a9a.xn--p1ai/sadm_files/xakoxokun.pdfIn PDF document text
    • https://guanlai.tw/uploads/files/202109151128367449.pdfIn PDF document text
    • https://harkakotony.hu/UserFiles/file/74644440972.pdfIn PDF document text
    • http://sendedianqi.com/upload_fck/file/2021-9-21/20210921181723963386.pdfIn PDF document text
    • http://ace-pharm.com/upload/files/28023434879.pdfIn PDF document text
    • http://duonglaohanoi.com/userfiles/file/34650428728.pdfIn PDF document text
    • http://stolizstekla.ru/userfiles/file/7407903158.pdfIn PDF document text
    • https://mmtours.si/uploads/vusosavevodotoma.pdfIn PDF document text
    • http://bellamy.tw/uploads/files/202109160624154960.pdfIn PDF document text
    • https://www.sahabatkeluargahomecare.com/wp-content/plugins/formcraft/file-upload/server/content/files/161381e8a71f72---xobixekoxagiguku.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_off0000af3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF3B 10704 bytes
SHA-256: fff0013c6ec4aaf9218b370204d6ec9a44144c172fb0bbd25fd3af36010f4a91
font_01_sfnt_off0000c7ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7EE 15128 bytes
SHA-256: a8516cca47ed9a0dd9bc97e5f77365c94e37068be643ad0ff8cad1df4eabad9c
font_02_sfnt_off0000ee22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE22 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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