Malicious PDF — malware analysis report

Static analysis result for SHA-256 dcf2f7440bb13841…

MALICIOUS

PDF

89.6 KB Created: 2021-07-03 01:33:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 76441994e6fe9f142cb560e225ada6a5 SHA-1: 9a534f2b531f23bfa627061838ae2c7f8bcc55c6 SHA-256: dcf2f7440bb138419afe6ac8213007f7d26b7f37bddaf597c092901021e0eac3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains numerous embedded URLs, many pointing to compromised CMS upload directories, suggesting a link farm designed to redirect users to malicious content. The presence of external URIs and link farms indicates an attempt to lure users to external sites, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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=aqualink+rs4+owners+manual PDF link annotation
    • https://asiatravel.kg/wp-content/plugins/super-forms/uploads/php/files/ec47e188dad449ddd87944d752a63a61/39081973273.pdfIn PDF document text
    • http://pnmanagementsolutions.in/uploads/10690326310.pdfIn PDF document text
    • https://mmagame.com/userfiles/file/84736914603.pdfIn PDF document text
    • http://stalmost.pl/userfiles/file/71128486530.pdfIn PDF document text
    • http://jplus-ag.com/upload/files/BodyFile__60D0147AC412F.pdfIn PDF document text
    • https://www.hamburgeriaagricola.com/wp-content/plugins/super-forms/uploads/php/files/8d6mr9ou4k6mp8fmdknmra8rmv/20254174777.pdfIn PDF document text
    • http://www.investing-in-women.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb4315416fb---71206377340.pdfIn PDF document text
    • http://canyonoaksmtg.com/~duckdi5/canyonoaksmtg.com/content/file/nurus.pdfIn PDF document text
    • https://ph2020.org/FCKeditor/file/kifubikugofebo.pdfIn PDF document text
    • https://stefandes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d7a7ec4bd17---69675547398.pdfIn PDF document text
    • https://vidolamerica.org/wp-content/plugins/super-forms/uploads/php/files/f8da158f3953bc238927aadb21604f88/remuwuf.pdfIn PDF document text
    • https://wacee.net/wp-content/plugins/formcraft/file-upload/server/content/files/16076ade3d30be---jepadobimusolu.pdfIn PDF document text
    • http://hitecds.com/userfiles/file/36603299649.pdfIn PDF document text
    • https://khotelmarket.com/FileData/ckfinder/files/20210606_DDA10DCAC7C136E6.pdfIn PDF document text
    • https://bloc-immo.com/images/20213579509.pdfIn PDF document text
    • https://sharzh-ufa.ru/wp-content/plugins/super-forms/uploads/php/files/533aa75d0a4d3eab7a7812086d0c75bf/49763768025.pdfIn PDF document text
    • https://www.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160704d6a0acf6---pemonad.pdfIn PDF document text
    • https://tuabogadoangel.com/wp-content/plugins/super-forms/uploads/php/files/0d4bf86ab73d35e0ca1e5b3882ac2538/19498102183.pdfIn PDF document text
    • http://www.advokat.com/app/webroot/img/fck/file/51618773008.pdfIn PDF document text
    • http://cambresisemploi.fr/ckfinder/userfiles/files/genajajoxejikeboji.pdfIn PDF document text
    • https://finestblogger.de/wp-content/plugins/super-forms/uploads/php/files/l9asjuj6n9ogonqnnafhjoaio9/fugakajetuneb.pdfIn PDF document text
    • http://medicapoland.pl/uploaded/file/babadopisabudinozuzig.pdfIn PDF document text
    • http://adamslakeband.org/userfiles/file/36447286826.pdfIn PDF document text
    • https://aonetreks.com/uploads/file/98320524724.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_off0000f839.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF839 18464 bytes
SHA-256: 61333c5a7adf3d0e29517d4595736284dd975468e1a4a620d4039be08f946c86
font_01_sfnt_off000128db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128DB 10652 bytes
SHA-256: 0104cba38d42595837a23cec47fc38a3e7f94ac0755c2ec2123ecddcd1b62542
font_02_sfnt_off00014156.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14156 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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