Malicious PDF — malware analysis report

Static analysis result for SHA-256 e4c26755d10d1791…

MALICIOUS

PDF

83.5 KB Created: 2021-09-08 22:57:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 9f93e3cb49bb48a0dbac687ca80ac663 SHA-1: 6e6259e492b2f836013a9924b96fc71347070419 SHA-256: e4c26755d10d1791c205b02526507e38203d36585e184bed082baa3b0fef0d77
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. The SE_CLICKFIX heuristic indicates the document employs social engineering to prompt the user to execute a command, likely to download and run a secondary payload. Numerous URLs were extracted, suggesting a link farm designed to host or redirect to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • ClickFix social engineering attack high SE_CLICKFIX
    Document instructs the user to press Win+R or paste a command into a terminal — consistent with ClickFix attacks that bypass macro restrictions by tricking users into running malicious commands directly
  • 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://ketchas.ru/uplcv?utm_term=how+do+i+format+my+sd+card+on+my+phone PDF link annotation
    • https://esz.jp/img/editor/files/muxofafomakikabebulix.pdfIn PDF document text
    • http://camara.acessoainformacao.org/uploads/ckfinder/files/loxef.pdfIn PDF document text
    • https://eetravel.net/file/jowivefakiko.pdfIn PDF document text
    • http://conwaychristian.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613836992ff4b---9340766420.pdfIn PDF document text
    • http://secureyun.cn/uploadfile/file///2021090407595166.pdfIn PDF document text
    • https://baatco.com/ckfinder/userfiles/files/46677772108.pdfIn PDF document text
    • https://twinslock.com/ckfinder/userfiles/files/803603395.pdfIn PDF document text
    • http://lookkorea.net/userfiles/file/93798513009.pdfIn PDF document text
    • https://quangcaowebsite.vn/uploads/files/jutika.pdfIn PDF document text
    • http://liebherr-tr.com/userfiles/file/36785894084.pdfIn PDF document text
    • https://biroestarsa.hu/uploads/file/pidogulaxiditavilanomamaz.pdfIn PDF document text
    • http://7seapharmtech.com/Uploadfiles/files/kidisav.pdfIn PDF document text
    • http://issaproject.com/app/views/panel/ckfinder/userfiles/files/31539114791.pdfIn PDF document text
    • http://eakqshop.com/ckfinder/images_store/files/punufavedonolijodubujikiz.pdfIn PDF document text
    • https://pharma-tools.eu/galeria/file/bogunugidijimekesokupaban.pdfIn PDF document text
    • http://aarogyamedico.com/userfiles/file/36790143433.pdfIn PDF document text
    • http://mbjarrahi.com/UploadedFiles/New/file/xabosazuwiketebukazid.pdfIn PDF document text
    • http://thevale.us/userimages/wizobobatod.pdfIn PDF document text
    • https://www.frontierexim.com/wp-content/plugins/super-forms/uploads/php/files/46nfu82slho9ga31g5oitf24um/sukefifuguxojulabevoxatof.pdfIn PDF document text
    • http://inkjetartandimage.com/Uploads/file/wolisuzajegulobujo.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/lld2ev77ap09ohofoblq1fdrb4/21382376316.pdfIn PDF document text
    • http://kidsjeodo.com/images/files/kufesenasogesoro.pdfIn PDF document text
    • http://homespakistan.net/magzine/uploadfiles/file/zesujorubavokenugi.pdfIn PDF document text
    • https://aimtronu.org/userfiles/file/47249825724.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_off0000dd27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD27 11028 bytes
SHA-256: 53bdb5b3ee50fae88ab4b42330e5d382a333b27d18a6f3d8679a67c82998156a
font_01_sfnt_off0000f6a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6A8 19296 bytes
SHA-256: 0fc2e5efa3b40c2384168dacdd2d33af65c38d4a7954f7148016af128ec59a11
font_02_sfnt_off0001283d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1283D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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