Malicious PDF — malware analysis report

Static analysis result for SHA-256 d1f243ee9197e9f6…

MALICIOUS

PDF

85.1 KB Created: 2021-09-15 23:22:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: aa934dac963add37c6beffe831e25255 SHA-1: 00685b42cf687bbd56dcd7999c8d58319e66ee17 SHA-256: d1f243ee9197e9f6f669caf5bcee99c90728198ed9900fc2a79239a71f711859
184 Risk Score

Malware Insights

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

The sample is a PDF document flagged by ML classifiers and ClamAV as malicious, specifically a phishing trojan. It contains embedded JavaScript and a link farm pointing to compromised WordPress sites, suggesting an attempt to exploit vulnerabilities or deliver further malicious content. The presence of a callback lure heuristic indicates the document's intent to trick users into initiating contact for fraudulent purposes.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9860

Heuristics 8

  • 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.
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://www.weldcor.ca/public/ckfinder/userfiles/files/90352917598.pdf In PDF document text
    • http://le-nora.com/userfiles/file/zararuzusepoji.pdfIn PDF document text
    • http://ride.hu/images/uploads/files/6019126629.pdfIn PDF document text
    • http://www.vitrierbxl.be/wp-content/plugins/formcraft/file-upload/server/content/files/161413f6ec8253---tilirojovevufigimebav.pdfIn PDF document text
    • http://aow.infogestnet.it/ckfinder/userfiles/files/jorizuwujimitaki.pdfIn PDF document text
    • https://hobbes-group.com/upload/files/gonozegozovexorepa.pdfIn PDF document text
    • http://pedraferro.com/files/files/49700737006.pdfIn PDF document text
    • http://atek-ent.com/upload/file/kadevelologaj.pdfIn PDF document text
    • http://foire-fromages-et-vins.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140794b73d0a---30618732878.pdfIn PDF document text
    • http://karpatskiles.ru/store/file/12447150153.pdfIn PDF document text
    • https://macintosh-szerviz-javitas.nuttydog.hu/ckfinder/userfiles/files/nisumunisonebezefitakune.pdfIn PDF document text
    • https://togeltop.net/contents/files/pimutuvodizejepanuxunotuf.pdfIn PDF document text
    • http://yushendesign.com/images_fck/file/1631541623.pdfIn PDF document text
    • http://wildpflanzen-planung.de/file/kuxapunodiv.pdfIn PDF document text
    • http://fjsxsx558.com/upload/files/vidaka.pdfIn PDF document text
    • http://vuoncotichdep.com/upload/files/66595604894.pdfIn PDF document text
    • http://sententtech.com/file_media/file_image/file/biletimatavoku.pdfIn PDF document text
    • https://kurishupally.org/userfiles/file/mavuno.pdfIn PDF document text
    • http://mxag.com/upload/browse/file/87891935212.pdfIn PDF document text
    • https://www.sensormaticltd.com/app/templates/js/ckfinder/userfiles/files/19947558316.pdfIn PDF document text
    • https://b2b-intelligence.it/uploads/file/lilirez.pdfIn PDF document text
    • http://dxqzx.com/ckfinder/userfiles/files/20210913_111358.pdfIn PDF document text
    • http://abapaposentados.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161419f80b4365---tomovogosupisigonujur.pdfIn PDF document text
    • http://mdtrend.hu/files/file/pejapewemo.pdfIn PDF document text
    • http://dui-antidote.com/images/userfiles/file/86106306466.pdfIn PDF document text
    • https://theloneranger.tv/clients/loneranger/ckfinder/userfiles/files/tojarususa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=how+to+create+an+android+app+iconPDF 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_off0000ea13.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA13 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001022a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1022A 10372 bytes
SHA-256: a0962ea066a95a79c148fae6fcee8eea9e671fba5e7ce73e90f239613a8868ba
font_02_sfnt_off000119b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119B1 17440 bytes
SHA-256: 3eaaefa988a301594d6e2f0b1f5b431cc4577b95631de9bab90a820a41b80c7c

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