Malicious PDF — malware analysis report

Static analysis result for SHA-256 ed53889e819e5968…

MALICIOUS

PDF

76.7 KB Created: 2021-09-18 23:16:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: c117902fd3ddfb3fd20d29b6b7283db8 SHA-1: 52ff5428edd4ca8444a6fd52822626db7dd8ad21 SHA-256: ed53889e819e5968b3fd4d6f7012e6bd0ebb951de8aa8e77006bc00394fcae73
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. The heuristic 'SE_CALLBACK_LURE' strongly suggests the document is designed to trick the user into calling a phone number, a common tactic in tech support scams or billing fraud lures. The presence of numerous links to PDF files hosted on compromised CMS uploads and disposable hosting further supports a malicious intent, likely to redirect users to malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://suportti.com/wp-content/plugins/formcraft/file-upload/server/content/files/161312ca91bf85---sedujamudip.pdf In PDF document text
    • https://kolegium.inaheart.org/upload/files/60396742336.pdfIn PDF document text
    • https://himalayanwanderer.com/himalayan/userfiles/files/venujeles.pdfIn PDF document text
    • http://ankaser.com/userfiles/file/dorupavakadewu.pdfIn PDF document text
    • http://azizolace.cz/images/file/34265832044.pdfIn PDF document text
    • https://www.gpaci.org.br/cms/ckfinder/userfiles/files/bogopowalelilimoruxobipo.pdfIn PDF document text
    • http://w-mill.jp/images/file/bawimojapilul.pdfIn PDF document text
    • http://coutleelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/zafavifererorenifinisote.pdfIn PDF document text
    • http://fructusartis.com/i/File/juguvevokanuv.pdfIn PDF document text
    • http://hqshop24.com/userfiles/file/33648940427.pdfIn PDF document text
    • http://wsp.pl/userfiles/file/7796549516.pdfIn PDF document text
    • http://law885995.com/upload/fckimages/file/kenipib.pdfIn PDF document text
    • http://radio6deenero.com/uploaded/files/dutubeje.pdfIn PDF document text
    • https://yptea.com/data/fckeditor/files/teran.pdfIn PDF document text
    • http://stluciachamber.org/uploadedImages/contentImg/file/17204863264.pdfIn PDF document text
    • https://www.hasmow.com.au/application/third_party/ckfinder/userfiles/files/4330307895.pdfIn PDF document text
    • http://medicapoland.pl/uploaded/file/8029920376.pdfIn PDF document text
    • https://travelinnsuites.com/nbloom/fckuploads/file/renedorap.pdfIn PDF document text
    • http://caacoding.net/wp-content/plugins/formcraft/file-upload/server/content/files/161345ffab4e9f---28859542238.pdfIn PDF document text
    • http://slowjamsundays.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141102f6818b---23006166935.pdfIn PDF document text
    • http://www.hkwebdesign.com.hk/wp-content/plugins/formcraft/file-upload/server/content/files/16138c989e4e7b---wuwapomokudolejo.pdfIn PDF document text
    • http://kite-surf.sk/files/43991635601.pdfIn PDF document text
    • http://bernendorf.ru/userfiles/file/22400549383.pdfIn PDF document text
    • http://micruts.org/userfiles/file/sufaxamago.pdfIn PDF document text
    • http://fujavietnam.com/images/Download/tezaxitiwiwaxofor.pdfIn PDF document text
    • http://marketypik.pl/zdjecia/fck/file/99788555139.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=download+war+machines+mod+apkPDF 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_off0000c304.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC304 10860 bytes
SHA-256: 8d504599f8a9c7dcb48e4051736ba2fb73ecd34e3db48c7a0806dc77d9d9846d
font_01_sfnt_off0000dbeb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBEB 18804 bytes
SHA-256: 81bc3fa5f3398ef82dbc206c189c99c1a7aa5843ad55e0855b85f65b9d1e4d76
font_02_sfnt_off00010d3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D3E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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