Malicious PDF — malware analysis report

Static analysis result for SHA-256 e2d990476b0d027d…

MALICIOUS

PDF

69.0 KB Created: 2021-10-02 15:02:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 1c3b76afaac7d7e5dc398b81b11361de SHA-1: 20599309da73ee5fb6dd54247b7f6424fa43d266 SHA-256: e2d990476b0d027dc32497cd9b3d6faa0f40ab5cfc678059de195db55ab5ce41
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The document body is unreadable, but the heuristic firings and URL analysis are sufficient to determine the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9849

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://malimbe.africa/wp-content/plugins/super-forms/uploads/php/files/d3af6ca181c0cbab51ff1de0018cbce6/95955469653.pdf In PDF document text
    • https://www.blackandwhite-salon.com/wp-content/plugins/super-forms/uploads/php/files/tmp/dakanatuwimusime.pdfIn PDF document text
    • http://www.putnamtaxi.net/wp-content/plugins/formcraft/file-upload/server/content/files/161565e487c778---90822500418.pdfIn PDF document text
    • http://montaze.org/democms/userfiles/file/perivevedejijorana.pdfIn PDF document text
    • http://shacklefordlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/debalope.pdfIn PDF document text
    • http://yournamebadges.com/withyourdog/cms_uploads/file/wevivizet.pdfIn PDF document text
    • http://e-park.es/img/uploads/files/24823449635.pdfIn PDF document text
    • http://thepokeluau.com/uploads/files/zibaju.pdfIn PDF document text
    • https://rajaunited.com/contents/files/17565301342.pdfIn PDF document text
    • http://topflexsports.com/uploads/lerejolupe.pdfIn PDF document text
    • http://kieryk.pl/img/userfiles/file/36356184136.pdfIn PDF document text
    • http://spadhotel.com/basefile/spadhotelcom/files/kafojafukerokivaroliviwus.pdfIn PDF document text
    • http://alde-pace.org/ckfinder/userfiles/files/situjif.pdfIn PDF document text
    • https://purefeeling8.com/data/file/20693407872.pdfIn PDF document text
    • http://volareinmongolfiera.it/userfiles/files/jexolufuzogapafesaf.pdfIn PDF document text
    • http://etkindenetim.com/resimler/files/65380280834.pdfIn PDF document text
    • https://icnj.net/ckeditor/ckfinder/userfiles/files/musefidom.pdfIn PDF document text
    • http://ariogalospspc.lt/userfiles/file/11435842743.pdfIn PDF document text
    • http://cantinachitarra.it/userfiles/file/lunarupidakivavavidebok.pdfIn PDF document text
    • https://ganport.pl/userfiles/file/36355905139.pdfIn PDF document text
    • http://rw-hse-businessconsulting.de/userfiles/file/juxug.pdfIn PDF document text
    • https://xn--64-mlcufjjaii0l.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/95d36e69f6fa522be6b98f44f343f8f1/kisisegojijoxu.pdfIn PDF document text
    • http://e-sheremet.com/img/16553196605.pdfIn PDF document text
    • http://cmi.nfe.go.th/ckfinder/userfiles/files/34720104012.pdfIn PDF document text
    • http://milkyway-vn.com/upload/files/zoxaxezolanezup.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=spanish+special+charactersPDF link annotation
    • https://tes-sys.com/uploads/ckfinder/files/20210929/16328710953213.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_off0000b14a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB14A 10428 bytes
SHA-256: c4f7a41f03ea7b7dd01e8a458970b11e5ed821d0b7b4534a88e32d715b09b11a
font_01_sfnt_off0000c8d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8D2 14840 bytes
SHA-256: fb5aa0e2cffb83b7b925211e2c846b9157f6fd4e5a78c638cd002318bb1bde92
font_02_sfnt_off0000ee58.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE58 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1