Malicious PDF — malware analysis report

Static analysis result for SHA-256 c403a81a81c840ca…

MALICIOUS

PDF

83.4 KB Created: 2021-09-19 03:59:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 500e15718de7e5be5baf45ed5b42531a SHA-1: 26fb1fa3b95dc68c23da89a7e3c5a446a30d717e SHA-256: c403a81a81c840caa8cc413d481d8b1363682cd2a589edf3b9a484fc73c5bcfc
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious File T1059.007 JavaScript

This PDF file was flagged as malicious by a machine learning classifier and ClamAV, indicating a high likelihood of malicious intent. The document contains a link farm pointing to compromised CMS upload storage and disposable hosting, suggesting it's designed to redirect users to malicious content. The presence of embedded URLs and the 'SE_CALLBACK_LURE' heuristic indicate a phishing or scam attempt, likely to trick users into downloading further malicious payloads or divulging sensitive information.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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
  • 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 https://tradingcall.in/ckfinder/userfiles/files/82443678605.pdf In PDF document text
    • http://baltic-rt.ru/ckfinder/userfiles/files/88706172091.pdfIn PDF document text
    • https://parvazyab.com/basefile/api203/files/wixivoma.pdfIn PDF document text
    • http://texmet.pl/userimages/file/pidebiver.pdfIn PDF document text
    • http://attep.com/home/sandbox/domains/heekee.com.hk/public_html/ckfinder/userfiles/files/watifazezilugutejafakiped.pdfIn PDF document text
    • http://aarogyamedico.com/userfiles/file/88700937021.pdfIn PDF document text
    • https://www.mozartcantat.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613d51166be9f---masevinenasaso.pdfIn PDF document text
    • http://nprofit.hk/userfiles/61736370534.pdfIn PDF document text
    • https://www.hungryalex.com/wp-content/plugins/super-forms/uploads/php/files/1d20a5c173efc616e17b4caa5f862852/93942347430.pdfIn PDF document text
    • https://mattweidnerlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613bd5fab7d7e---14184530877.pdfIn PDF document text
    • http://marinda.ru/pics/images/file/fojowafozobomosukid.pdfIn PDF document text
    • http://sun-green.de/ckfinder/userfiles/files/xizofifaxidumozizeja.pdfIn PDF document text
    • http://adabaskimerkezi.com/upload/file/sulawuretorejolivumexuni.pdfIn PDF document text
    • http://cityfate.com/files/files/69469032406.pdfIn PDF document text
    • https://fluffy-chins.com/images/file/81467837429.pdfIn PDF document text
    • https://sanaspinler.net/calisma2/files/uploads/tafuvinebakenuxasotitan.pdfIn PDF document text
    • https://www.mediawerf.nl/bundles/store24backoffice/ckfinder/userfiles/files/vemarukemiwoxinekafatu.pdfIn PDF document text
    • https://venefoil.com/ckfinder/userfiles/files/83312385349.pdfIn PDF document text
    • http://telek-trans.hu/editor_up/23960324637.pdfIn PDF document text
    • http://topup-fight.com/ckfinder/userfiles/files/54733778777.pdfIn PDF document text
    • https://inclinedigital.com/wp-content/plugins/formcraft/file-upload/server/content/files/161402e9d5fe35---kisanidex.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/4iubfub6jr97ucsi2dcdaj16a6/28162951556.pdfIn PDF document text
    • http://macro-e.com/app/webroot/userfiles/files/pobenebuw.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=login+360+emailPDF 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_off0000e204.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE204 18032 bytes
SHA-256: 622cea3d390e1991dda63ad90cc3dbf14a651b56522140a22be2b34dd82ab134
font_01_sfnt_off000110a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110A2 10504 bytes
SHA-256: 372488d3ab500554645568ad307f02d5f2f76ec5e17aea3a9e0738d188e1ce0f
font_02_sfnt_off00012875.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12875 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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