Malicious PDF — malware analysis report

Static analysis result for SHA-256 4f3c1945d39a31f8…

MALICIOUS

PDF

96.9 KB Created: 2021-06-28 06:20:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: b91b88079a1544f48ad81b4535f68d1d SHA-1: b2dfd773466b4f76f82084f2b35876c9a1144cd0 SHA-256: 4f3c1945d39a31f877d75cc3977b5fda09f4ae5df5c47ef435b81ded16f5b29a
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.001 PowerShell

This PDF file was flagged by a machine learning classifier and ClamAV as malicious. It contains a 'clipboard command execution lure', instructing the user to copy and paste commands into a shell, which is a common technique for downloading and executing secondary payloads. The numerous embedded URLs, many pointing to compromised WordPress sites, suggest a phishing or spam campaign aimed at distributing malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9937

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
  • Clipboard command execution lure high SE_CLIPBOARD_COMMAND_LURE
    Document tells the user to copy or paste clipboard content into Run, PowerShell, cmd, or another shell-like execution context
  • 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://medvor.ru/uplcv?utm_term=how+to+create+a+local+minecraft+server PDF link annotation
    • http://www.virtualaid.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16091617ed3626---98197324357.pdfIn PDF document text
    • http://aryajob.com/user_upload/file/rukoj.pdfIn PDF document text
    • https://eduinfinite.com/wp-content/plugins/super-forms/uploads/php/files/e02040c0eade6eea6f9afae3dee956a8/33059096607.pdfIn PDF document text
    • http://webscape.co.bw/wp-content/plugins/formcraft/file-upload/server/content/files/16094a4ea71a44---xibawada.pdfIn PDF document text
    • https://stellabakingcompany.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9363a7b13f---kegoravolepolerakelanip.pdfIn PDF document text
    • http://bennyhigh73.com/clients/3/33/33ce00c6a031cf3b17a3dcf69aaa7594/File/88925746474.pdfIn PDF document text
    • http://chistogood.ru/admin/ckfinder/userfiles/files/71350104452.pdfIn PDF document text
    • http://rc-modeller.se/images/file///zerudus.pdfIn PDF document text
    • http://tamilannuaire.com/var/www/vhosts/vps296430.ovh.net/tamilannuaire.com/images/file/pufoxoxiwopojusamezip.pdfIn PDF document text
    • https://taxiporec.top/wp-content/plugins/super-forms/uploads/php/files/3caeln2c0dfe8g125m931959mf/87304575636.pdfIn PDF document text
    • http://nc2e.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607df30d7cd57---vafilelolegoxulixe.pdfIn PDF document text
    • https://www.qbuildsoftware.com/wp-content/plugins/super-forms/uploads/php/files/c3d4ca9e9b294ba9e290ef99bee9e708/67899128827.pdfIn PDF document text
    • https://rowadalbyt.com/userfiles/files/98276714207.pdfIn PDF document text
    • http://rhodeislandalpha.com/clients/56223/File/pebutowivilobuvok.pdfIn PDF document text
    • http://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/lfg0jm6f0achtlujbti60k2cul/kumosowujuxobakekur.pdfIn PDF document text
    • https://shared401k.com/wp-content/plugins/super-forms/uploads/php/files/9ac41e23cb914a591048c40a8e325b9c/70022070792.pdfIn PDF document text
    • http://fobosgrunt.ru/files/ckfinder/files/73820642195.pdfIn PDF document text
    • http://thanhlamresort.vn/wp-content/plugins/formcraft/file-upload/server/content/files/160a0aa5b37aaf---livusofunedasiwar.pdfIn PDF document text
    • http://lawcab.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1609fccf4871ba---99153059653.pdfIn PDF document text
    • https://xn--nmqu14inmf.com/upload/files/loxemo.pdfIn PDF document text
    • https://hgb.se/filer/file/nirenazuwor.pdfIn PDF document text
    • https://forcechicago.com/wp-content/plugins/super-forms/uploads/php/files/1b5cdf640ad8c7b481fc31e9b4844bf3/98632679594.pdfIn PDF document text
    • http://qtjdb.com/UploadFile/2021/06/25/file/20210625_194248_148.pdfIn PDF document text
    • http://consulcongress.it/uploads/assets/file/31265699460.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/33258534900.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_off00011592.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11592 10640 bytes
SHA-256: 425f117388390d7b990d3c31c306885153bcb91e463ddda3de2c326031357dd9
font_01_sfnt_off00012dec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DEC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000145fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x145FE 17688 bytes
SHA-256: 82ffc0cc0b38334b8ea64caf65a41b7f095591d96d0e59893055ac11d9c06a27

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