Malicious PDF — malware analysis report

Static analysis result for SHA-256 9ea1dfa90264bfb5…

MALICIOUS

PDF

79.3 KB Created: 2021-09-08 03:10:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 58d56b043e430caada424e7fb339fd39 SHA-1: 567d857caeaa0494576072d028a96cfbf9b31d5d SHA-256: 9ea1dfa90264bfb588fc8f3712952f2b0665a9c8f44bd023938cd7982dcb8682
156 Risk Score

Malware Insights

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

This PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many pointing to compromised CMS uploads and disposable domains, which are characteristic of link farms used to distribute malware or conduct phishing campaigns. The PDF structure itself appears to be generated by wkhtmltopdf, suggesting it was programmatically created to host these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://jaunimodienos.lt/wp-content/plugins/super-forms/uploads/php/files/f8r378r55hlmnloro7ed2hkdrc/43917412708.pdf In PDF document text
    • https://www.dazzlingdecor.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/161290e0c50c22---14122237162.pdfIn PDF document text
    • https://www.pharmawell.eu/ckfinder/userfiles/files/45867196469.pdfIn PDF document text
    • https://ww150001.linebot.net/upfile/files/20210820190028.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/d32qc6njm21tv2brrl3qokh330/xebuxovibiniguv.pdfIn PDF document text
    • https://fruitssupplier.com/app/webroot/img/files/84066874736.pdfIn PDF document text
    • http://romengo.com/ckfinder/userfiles/files/fuzot.pdfIn PDF document text
    • http://trenermichal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1606d40d3e3113---50198719973.pdfIn PDF document text
    • http://vet-arrighicolangelicristilli.eu/userfiles/files/zevatiliwokotuzu.pdfIn PDF document text
    • http://asavn.vn/uploads/userfiles/files/rafexuw.pdfIn PDF document text
    • http://www.sandzthabapanel.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc0ef9d4cf---lalasajajosafojo.pdfIn PDF document text
    • http://csc0535.com/userfiles/file/20210730165214_98iyj2.pdfIn PDF document text
    • https://www.visitrwanda.com/wp-content/plugins/super-forms/uploads/php/files/c83882430d3e89a60e30a2a506dc2783/30647424565.pdfIn PDF document text
    • https://morethancleaningservices.com/wp-content/plugins/super-forms/uploads/php/files/184aa15902bfa61a8d0ec8be80dd8803/16226491378.pdfIn PDF document text
    • https://mimpishio2.net/contents//files/90266054494.pdfIn PDF document text
    • https://evenimentecastel.ro/wp-content/plugins/super-forms/uploads/php/files/p6tpf6um9b9r7fam64q905naim/19602316700.pdfIn PDF document text
    • https://premiumvipbusiness.com/wp-content/plugins/super-forms/uploads/php/files/9f05252afc4932314d8e25c8103ac270/59998829071.pdfIn PDF document text
    • http://www.veronicaneal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/160989f28212f6---buputud.pdfIn PDF document text
    • http://theorientgarden.iorderfoods.com/uploads/files/jowijekupe.pdfIn PDF document text
    • https://subarini.ro/mm/file/19145033423.pdfIn PDF document text
    • http://hondatayho.vn/images/ckeditor/files/fudav.pdfIn PDF document text
    • http://e68momo.com/shopadmin/upload/files/tovewusuwujomafegom.pdfIn PDF document text
    • https://tfsroanoke.com/home/tfs/public_html/new/ckfinder/userfiles/files/xipopeva.pdfIn PDF document text
    • https://actioncoach.com.my/wp-content/plugins/formcraft/file-upload/server/content/files/1610af3ad6a0a3---63534957945.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=radiology+pdf+books+free+downloadPDF link annotation
    • https://mediaget.com/userfiles/files/82804232425.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_off0000d072.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD072 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e889.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE889 11052 bytes
SHA-256: 513c15702f1c120a5e91d9a19e3b7c6c76176036c29511ff481d03a4cfc40554
font_02_sfnt_off00010202.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10202 17408 bytes
SHA-256: 98a5a4d15b64a9269678c5823a0f8ce852e56e7cec85dfb06fceb0be2c361b2c