Malicious PDF — malware analysis report

Static analysis result for SHA-256 4f013ddcf3e7fbf1…

MALICIOUS

PDF

76.7 KB Created: 2021-09-08 11:42:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 16c9a814e92a2dad73324e999fe5f651 SHA-1: e6d07eefc07eabf2666897257ce3a743af092a0e SHA-256: 4f013ddcf3e7fbf13f5ccfff9d203f49f3bc2d5c3cfd0a0d8d88764e14b113f8
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It functions as a link farm, containing numerous embedded URLs that point to external sites, many of which appear to be compromised or hosted on disposable domains. The primary purpose seems to be directing users to potentially malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://catamma.ru/uplcv?utm_term=empirical+and+molecular+formula+worksheet+dr+s+buktenica PDF link annotation
    • http://goreskyreunion.com/clients/b/ba/ba087d28c24afe6c5bc45fa062332e47/File/15289438448.pdfIn PDF document text
    • http://steakclubhn.com/campannas/file/xepiduseriremiz.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/b8775705ebdd49bfd78e84f50142bffa/33238343831.pdfIn PDF document text
    • https://happycolaborativo.com/uploads/files/96908488725.pdfIn PDF document text
    • http://www.mywil.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1608e3f6bbf030---vitodejulimajawadunemax.pdfIn PDF document text
    • http://club-integra.ru/userfiles/file/44030460107.pdfIn PDF document text
    • http://www.greenbriarpropmgmt.com/wp-content/plugins/super-forms/uploads/php/files/5d0e2037a875a3836bcf78b128f018dd/kusejibasavok.pdfIn PDF document text
    • http://katachizu.com/img/news/files/pazinelufe.pdfIn PDF document text
    • http://reutlinger.pl/userfiles/file/pozizubupijatajoguron.pdfIn PDF document text
    • http://foxgraphics.paulsfashion.in/files/fifixata.pdfIn PDF document text
    • http://harekatmemuru.com/images/Media/files/werifutebi.pdfIn PDF document text
    • https://thejinglelab.com/wp-content/plugins/super-forms/uploads/php/files/82fccbua0u89snqrin31h2j0d8/64114738177.pdfIn PDF document text
    • http://cfacgroup.com/uploads/FCK_files/file/pedogumelipitugitozas.pdfIn PDF document text
    • https://bnbtravels.com/ckfinder/userfiles/files/walolasaluwodoja.pdfIn PDF document text
    • https://odontologosmalca.com/images/userfiles/file/43690721219.pdfIn PDF document text
    • http://ph-easycome.com/userfiles/file/karisitomukakobukuwu.pdfIn PDF document text
    • http://delfosventures.net/userfiles/files/47809892728.pdfIn PDF document text
    • http://duda-tech.pl/dudatech/upload/file/37411428304.pdfIn PDF document text
    • https://membermimpi.com/contents/files/waferezuxinavonixawisoj.pdfIn PDF document text
    • https://akarchlight.com/wp-content/plugins/super-forms/uploads/php/files/9ff5395e4d914a027529733218a89ca3/zokidolalo.pdfIn PDF document text
    • http://www.hcibatiment.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160c3ad551039a---37463715249.pdfIn PDF document text
    • http://www.dnevi-sekretarjev.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160a5b65d2b3ae---luxadibozepedoburaworif.pdfIn PDF document text
    • https://homini.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16083a83390113---35340673283.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_off0000c63e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC63E 17184 bytes
SHA-256: bc363c54529992e0b83fe6e919fed8cdd4750791185bac5e2e0a4cf50820dd3a
font_01_sfnt_off0000f267.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF267 11288 bytes
SHA-256: fa15273a2163ecc2ae895facc60d7c4515763e502851b0248534af9314213f9a
font_02_sfnt_off00010c88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C88 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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