Malicious PDF — malware analysis report

Static analysis result for SHA-256 f6c79213ee07c40b…

MALICIOUS

PDF

83.7 KB Created: 2021-08-15 05:17:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: d9b467ece4062d8685fdb05098c3b9f4 SHA-1: 606f93701366089a81ec8033470d255b37854774 SHA-256: f6c79213ee07c40b97723c441e7bffc15a73ab5a698cc00dd997aa90ce7debc5
164 Risk Score

Malware Insights

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

This PDF file was identified as malicious by a machine learning classifier and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous embedded URLs that point to compromised websites, likely to lure users into phishing or downloading further malware. The presence of a 'Download' button heuristic further supports the deceptive nature of the document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://smidgel.ru/uplcv?utm_term=simple+present+tense+reading+worksheets+pdf PDF link annotation
    • http://bizbecho.com/pa/trainstation/uploads/image/file/loxatesixunubar.pdfIn PDF document text
    • https://www.inkfactory.pk/wp-content/plugins/formcraft/file-upload/server/content/files/1609d00963311d---lagikakubujuveb.pdfIn PDF document text
    • http://bjbtrh.com/files/pic/file/55984671201.pdfIn PDF document text
    • http://soflocops.com/clients/67403/File/lujibuzuvovapijul.pdfIn PDF document text
    • http://jockmurray.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609cab18886a9---wajidukibewesenevo.pdfIn PDF document text
    • https://www.hamburgeriaagricola.com/wp-content/plugins/super-forms/uploads/php/files/qq3imsuhfscsblu05ej567vj93/merepuvi.pdfIn PDF document text
    • http://lbs.ac.at/wp-content/plugins/super-forms/uploads/php/files/p08g2lgq7sfvquvsrj9nhgija6/12292545693.pdfIn PDF document text
    • https://washlounge.in/ckfinder/userfiles/files/mufigoxabudigupavapute.pdfIn PDF document text
    • http://www.nagsa.es/ckfinder/userfiles/files/33073245346.pdfIn PDF document text
    • https://stcatherine.ac.ug/wp-content/plugins/formcraft/file-upload/server/content/files/160a062328bc31---21330850085.pdfIn PDF document text
    • http://jysfh.com/upload_fck/file/2021-8-5/20210805094449117097.pdfIn PDF document text
    • http://www.atrium-tuiles.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607273ecf1976---38695699340.pdfIn PDF document text
    • http://jcon-aps.dk/userfiles/file/34134304221.pdfIn PDF document text
    • http://nusamulticentralestari.com/Uploads/userfiles/files/kemavojijudogi.pdfIn PDF document text
    • http://xn--l3cbpp3gh4a5g5c.com/userfiles/files/fivilawidegavej.pdfIn PDF document text
    • http://www.multigacos.com/admin/uploaded/fck/file/bekolaviwox.pdfIn PDF document text
    • http://www.driftime.ee/wp-content/plugins/formcraft/file-upload/server/content/files/1607968a4e70bb---kanulunotifotevirunug.pdfIn PDF document text
    • https://condominiovillage.com/userfiles/file/lubigejisolex.pdfIn PDF document text
    • https://www.inter-tube.co.uk/wp-content/plugins/super-forms/uploads/php/files/a64acf2560e0ca24ad15b47098c4fefd/bugopinuloma.pdfIn PDF document text
    • https://bamor.org/userfiles/file/kofugevewutapifumutor.pdfIn PDF document text
    • https://cremeconferences.com/wp-content/plugins/super-forms/uploads/php/files/85f24bb3c21c7c3958229a6373fa63de/94050547602.pdfIn PDF document text
    • https://maloneslandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f4b9cee008---kokabuk.pdfIn PDF document text
    • https://shipnhanh247.vn/asset/files/jaxapa.pdfIn PDF document text
    • http://www.next-conseil.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160a1676108e8d---wuletujiwinamivakexub.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_off0000e02e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE02E 17660 bytes
SHA-256: f45c70ab48c4e873726ae7cc96237eb4835ea90393de5f14a54b61e30e316749
font_01_sfnt_off00010e54.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E54 11200 bytes
SHA-256: dc5c76a8295fdcfc97173468c9ed0778b79cbf21812613531e153ce01823a7ff
font_02_sfnt_off00012823.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12823 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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