Malicious PDF — malware analysis report

Static analysis result for SHA-256 a5788596ec64f9f5…

MALICIOUS

PDF

75.3 KB Created: 2021-10-07 18:56:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 291fd374ba0838535cc949f06b4eefbb SHA-1: 0e9367fd809b13df820b4f295e14c415f383953f SHA-256: a5788596ec64f9f50edcc9baeb8c067b2c393adfef03202e015e0b4e4710d8cc
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. It contains a link farm pointing to various domains, many of which are hosted on compromised CMS upload storage or appear to be disposable. The ML classifier also strongly indicated maliciousness. The primary attack pattern involves directing users to external, potentially malicious websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://vhcvietnam.vn/ckeditor/images/files/54891348185.pdf In PDF document text
    • http://wdnederland.nl/file/53640169030.pdfIn PDF document text
    • http://instant-image.net/UserFiles/Site/File/fawomub.pdfIn PDF document text
    • http://1night2daytour.com/ckupload/files/79836931998.pdfIn PDF document text
    • https://usgcambodia.com/userfiles/file/nejiroj.pdfIn PDF document text
    • http://gocash2u.xyz/userfiles/file/dinufedirazepi.pdfIn PDF document text
    • https://uaqbakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1615e429de9525---fubufo.pdfIn PDF document text
    • http://hungthanhauto.com/luutru/files/93338750833.pdfIn PDF document text
    • http://swaptoys.org/ckeditor/uploads/files/63447018034.pdfIn PDF document text
    • https://myphambambi.com/webroot/img/files/6918085993.pdfIn PDF document text
    • https://creationstationdance.com/wp-content/plugins/formcraft/file-upload/server/content/files/16145fb80063a4---felobipa.pdfIn PDF document text
    • http://packamate.com/userfiles/98194209648.pdfIn PDF document text
    • http://chieusangducphat.com/uploads/userfiles/file/79895025453.pdfIn PDF document text
    • http://beijingteye.com/upload/files/xodagapojebazudenumu.pdfIn PDF document text
    • https://spacio.hk/attachment/file/86104289083.pdfIn PDF document text
    • https://www.officinadelgustoroma.com/wp-content/plugins/super-forms/uploads/php/files/721a44768a457fe8974916befe4cd657/56523837304.pdfIn PDF document text
    • http://cortocircuito.trialpanel.com/images/Upload/files/tagizigilozumekanemarori.pdfIn PDF document text
    • https://tainandentist.com/uploads/files/202110031755352480.pdfIn PDF document text
    • http://fjzy18.com/image/uload/files/10103581666.pdfIn PDF document text
    • https://www.assofmt.org/ckfinder/userfiles/files/zojopixodo.pdfIn PDF document text
    • http://elhammagazine.com/ckfinder/userfiles/files/fajekemopedovug.pdfIn PDF document text
    • https://wamsconference.com/wp-content/plugins/super-forms/uploads/php/files/d2affe723a144a11d541dab75b403109/wadugugonubalideregusos.pdfIn PDF document text
    • https://learn-atdi.com/uploads/files/48061083550.pdfIn PDF document text
    • http://conomiya.com/images/uploadedimages/file/jixibugodofinakasejaromez.pdfIn PDF document text
    • http://manpukulivermore.com/uploads/files/nosukizibamilovar.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=as+is+basis+meaningPDF link annotation
    • 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_off0000c2fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC2FA 10208 bytes
SHA-256: 1e40f9f0b700b977d217edbaa615ac39f89c403f7ef9081aabd7208216509102
font_01_sfnt_off0000d9d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9D8 18036 bytes
SHA-256: 6022eb36e481fbe0633463081bb84c9d4e9c0e579466e7d26caa01a3a76dd2f1
font_02_sfnt_off00010803.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10803 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.