Malicious PDF — malware analysis report

Static analysis result for SHA-256 16a3b94f44ef8422…

MALICIOUS

PDF

85.3 KB Created: 2021-09-10 12:49:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 0acf2f7dfb09df3d1ab470c2ce0ec454 SHA-1: f57bcae512cfc6ce30964486fee1eeb2da7a69ab SHA-256: 16a3b94f44ef8422b7990f6d8a25695796d4b4111b06c2ad019d863bf0b90f9d
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with many URLs pointing to potentially compromised websites or disposable hosting. The document body is heavily obfuscated and unreadable, suggesting it is not intended for direct user interaction but rather to facilitate the redirection to malicious external content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9860

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 http://eortak.com/img/fck_temp/file/fetokupimigixasasowoke.pdf In PDF document text
    • http://namjapizza.com/app/webroot/files/97515271213.pdfIn PDF document text
    • https://mimpishio.com/contents/files/18469204587.pdfIn PDF document text
    • http://fairfresh.net/assets/admin/ckeditorimage/files/dejatulojaxoxo.pdfIn PDF document text
    • http://ddaengshop.com/ckupload/files/44609512715.pdfIn PDF document text
    • http://grandp.ru/userfiles/file/riremosejizupemetirok.pdfIn PDF document text
    • https://saftanton.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16136f62ac8665---vozepudaruxaxis.pdfIn PDF document text
    • http://ros-grad.ru/fck_editor_files/files/rudonalajaridimojabagitir.pdfIn PDF document text
    • https://elitestrategyglobal.com/wp-content/plugins/super-forms/uploads/php/files/bb0fb86e527b923a2e5e06bfd5679c59/82251435026.pdfIn PDF document text
    • https://onderdurdu.com/upload/ckfinder/files/32167774818.pdfIn PDF document text
    • http://ggmtc.net/userfiles/files/41066188396.pdfIn PDF document text
    • http://medi-sen.com/files/files/79517424133.pdfIn PDF document text
    • https://giaphutelecom.com/tctt/sites/aaa/file/zoloxefirosubozameleju.pdfIn PDF document text
    • http://medizator.ru/ckfinder/userfiles/files/xevisabotovotojofo.pdfIn PDF document text
    • http://solarissoft.com/img/userfiles/files/61103983708.pdfIn PDF document text
    • https://unaizahic.com/Files/files/famuporajapuken.pdfIn PDF document text
    • http://nsk-nalogov.net/upload/files/voxepunubep.pdfIn PDF document text
    • http://reversetheclocknow.com/ckfinder/userfiles/files/53761217687.pdfIn PDF document text
    • http://www.cenlafilm.com/siteuploads/editorimg/file/radakajugagepa.pdfIn PDF document text
    • http://xn--80aafjbaeihgganggf9ajkncugh2a.xn--p1ai/pict/file/84629011300.pdfIn PDF document text
    • https://techson-cctv.com/upload/file/32925348944.pdfIn PDF document text
    • http://abwcockeysville.com/uploads/files/vokurasiwituruludowazudus.pdfIn PDF document text
    • http://www.web-globus.de/ckfinder/userfiles/files/4052921385.pdfIn PDF document text
    • https://luxartparquet.com/wp-content/plugins/super-forms/uploads/php/files/493b3e46397b71eb733d3760831e4684/19551816607.pdfIn PDF document text
    • https://www.institutvzdelavani.cz/files/62069914521.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/161397dcb09d9f---foxugoxaniradubizefuwo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=redmi+note+pro+9+max+8gb+ramPDF 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_off0000dfbf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFBF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f7d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7D1 20644 bytes
SHA-256: 1dd8a4afba2dbc65d9616d6ea6ce3b33d0961212f873f7eeb581969f4e009cba
font_02_sfnt_off00012dde.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DDE 11184 bytes
SHA-256: 9dfb60cec5d7780cf3d622aec7828dbd4616691d564c7f41516a98ce795587ab

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