Malicious PDF — malware analysis report

Static analysis result for SHA-256 831d14f07fbcc3b9…

MALICIOUS

PDF

83.3 KB Created: 2021-09-17 03:02:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: ee72b1e4cbf31362516d0160d408ca4d SHA-1: a5aca117ec8dbb03e757f1b6550f0774e2b0eb0b SHA-256: 831d14f07fbcc3b93ba8cd0fe5abb357c48ff574b77efd609cfa885ffd97cc6a
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. The document contains numerous embedded URLs, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users. The 'SE_CALLBACK_LURE' heuristic indicates the document may be attempting a callback phishing or tech-support scam. No scripts were extracted, but the presence of numerous external links strongly suggests the intent is to lead the user to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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 https://catamma.ru/uplcv?utm_term=redmi+note+9+pro+fastboot+stuck PDF link annotation
    • https://izyskately.ru/foto/ck/files/75868444659.pdfIn PDF document text
    • https://auf.vn/wp-content/plugins/super-forms/uploads/php/files/kdv2c1kincpvjnn947p7h7lm46/89287483814.pdfIn PDF document text
    • http://rogersdesignhouse.com/uploads/files/84302941976.pdfIn PDF document text
    • https://drhuanghair.com/uploads/files/202109041054312196.pdfIn PDF document text
    • http://leylatoprak.com/userfiles/file/61867457659.pdfIn PDF document text
    • http://philboyd.com/10827136660.pdfIn PDF document text
    • http://veterky.ru/ckfinder/userfiles/files/82525309444.pdfIn PDF document text
    • http://p-energo.ru/content/file/17528251432.pdfIn PDF document text
    • http://bonaparte-kerkrade.nl/fckeditor/ckfinder/userfiles/file/94414823339.pdfIn PDF document text
    • https://bringem.de/wp-content/plugins/super-forms/uploads/php/files/793387815555a9e39e770dc0e3a97ab2/defuvosutobovapumorejijab.pdfIn PDF document text
    • http://bretagne.annuaire-regional.com/ckfinder/userfiles/files/kunitiwedolijudibatexudaw.pdfIn PDF document text
    • http://seowonbattery.com/files/fckeditor/file/1146794557613ae002cf941.pdfIn PDF document text
    • https://lolakarimova.uz/ckfinder/userfiles/files/75594475038.pdfIn PDF document text
    • https://fertilizergranulatorprice.com/d/files/duzijor.pdfIn PDF document text
    • http://hondatayho.vn/images/ckeditor/files/17380407422.pdfIn PDF document text
    • http://phamtrangia.com/upload/files/18769857343.pdfIn PDF document text
    • http://acetuitioncentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161404bcf662b0---60734274159.pdfIn PDF document text
    • https://dalycity.com/wysiwygfiles/file/68285487644.pdfIn PDF document text
    • http://pradakshinam.com/fck_uploads/file/zenoko.pdfIn PDF document text
    • http://toyotarent.tw/FileData/ckfinder/files/20210905_311D279AC33F7DF4.pdfIn PDF document text
    • https://puertoestereo.com/wp-content/plugins/super-forms/uploads/php/files/2so6c815tkrprum1inanju7gvj/7192058049.pdfIn PDF document text
    • http://kerrya.com/ckfinder/userfiles/files/kisijegam.pdfIn PDF document text
    • http://casinodanmarkjackpot.dk/userfiles/file/63651223240.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_off0000dc02.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC02 18472 bytes
SHA-256: e1cb09b979d39c8c77a777838285c63591604961e743eef40f478d3d29f360bb
font_01_sfnt_off00010cee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CEE 11280 bytes
SHA-256: 9ea514d39651f4644afe3e9ca87c4e0a94fc4374bd59185200ee53770d89809b
font_02_sfnt_off00012741.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12741 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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