Malicious PDF — malware analysis report

Static analysis result for SHA-256 712ce2150923665b…

MALICIOUS

PDF

81.4 KB Created: 2021-09-17 11:34:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 3013cb449f1ee197cc18b6dbed9fe6b5 SHA-1: 7245f5b6a06d5f75da7182a979cd5a22ff33b290 SHA-256: 712ce2150923665b4dc584d0a8f75a8fe7923c7928da279de3e943995b1289d2
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous embedded URLs, many of which point to potentially compromised or disposable hosting. Heuristics indicate it functions as a link farm and employs lures such as QR codes and callback phishing, suggesting an attempt to redirect users to malicious sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://lifecontinues.ru/images/files/13328598673.pdf In PDF document text
    • http://crocepadrekolbe.it/userfiles/files/gutinap.pdfIn PDF document text
    • http://fskyok.com/uploadfile/files/puloweturopamipu.pdfIn PDF document text
    • https://pasarangroup1.com/contents/files/zefuwu.pdfIn PDF document text
    • http://majorpropertygroup.com/userfiles/files/11242747876.pdfIn PDF document text
    • http://eco-versute.com/app/webroot/ckfinder/userfiles/files/38126773831.pdfIn PDF document text
    • https://samsungvrvklima.com/upload/ckfinder/files/bozezoma.pdfIn PDF document text
    • https://www.beadvised.co.uk/wp-content/plugins/super-forms/uploads/php/files/b53eaaaf3654aab5a88915bdaa79bef9/41399053830.pdfIn PDF document text
    • https://bednidhitraders.com/userfiles/file/1325584232.pdfIn PDF document text
    • http://toshiteriyakiburien.com/uploads/files/lusuxuziluxifagafupixoniz.pdfIn PDF document text
    • http://lotuscourtpune.com/wp-content/plugins/super-forms/uploads/php/files/b833bf8cb2d38abb19816bb67c390f55/22642065409.pdfIn PDF document text
    • https://www.mobytec.com.br/mobytec/wp-content/plugins/formcraft/file-upload/server/content/files/1613d7fff5b0cd---42226317864.pdfIn PDF document text
    • https://rowsontw.com/shopadmin/upload/files/47882656685.pdfIn PDF document text
    • http://thevisionkharj.com/userfiles/files/lorupefonaxipujoj.pdfIn PDF document text
    • http://apsons.eu/files/file/23027399620.pdfIn PDF document text
    • http://sosonomo.com/ckfinder/userfiles/files/fujosazipalafiwun.pdfIn PDF document text
    • http://emrc.ie/upload/imagecontent/file/24525441889.pdfIn PDF document text
    • http://vdi.vn/userfiles/file/givego.pdfIn PDF document text
    • http://getsolarnj.com/userfiles/file/55976543666.pdfIn PDF document text
    • http://dreamwith.gni.kr/ckupload/files/mofigosudez.pdfIn PDF document text
    • https://hotelritariccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/16140400801d23---ragivalolowovizalo.pdfIn PDF document text
    • https://korzo-galeria.hu/files/file/58856495852.pdfIn PDF document text
    • http://www.corazondelsol.es/ckfinder/userfiles/files/16107770830.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=scan+qr+code+image+on+phonePDF 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_off0000d8d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8D7 18064 bytes
SHA-256: fc3c025e62bf2d8b4c09516e7bd788cdcac5e6e57d74c290c3f3664a3097e1fb
font_01_sfnt_off0001077e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1077E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011f95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F95 10872 bytes
SHA-256: 689808de6338a4eecd4e70eb220178783ae6864738f3bc585d500c7a0d0dc678

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