Malicious PDF — malware analysis report

Static analysis result for SHA-256 4516d2a7b4a46806…

MALICIOUS

PDF

77.1 KB Created: 2021-09-24 04:50:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 257ac3225b69f8c2be0030d28460a257 SHA-1: 50cab650c2201558cd2d9fcc1ef96edf5c73d380 SHA-256: 4516d2a7b4a468066e6d821afdf2fca2721e871a71a2b46b5419eae9a685a0d4
176 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The heuristic 'SE_CALLBACK_LURE' suggests the document is designed to trick users into calling a phone number, consistent with phishing or tech support scams. The presence of numerous external URLs, many hosted on compromised WordPress sites, further supports the malicious nature of the document, likely serving as a lure or part of a link farm to distribute further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://archism.ru/uplcv?utm_term=glencoe+algebra+1+pdf PDF link annotation
    • http://makaifruits.com/wp-content/plugins/formcraft/file-upload/server/content/files/16143eb0bebe03---xabaf.pdfIn PDF document text
    • https://nceptionsolutions.com/wp-content/plugins/super-forms/uploads/php/files/a2910f5662a6cab1ae56650c40d3ef2b/disevuxonadapareje.pdfIn PDF document text
    • http://controldellaves.com/app/webroot/arxius/file/zikina.pdfIn PDF document text
    • http://leeclinic.kr/userData/board/file/pepimibimagane.pdfIn PDF document text
    • http://www.feniuniversity.edu.bd/app/webroot/ckfinder/userfiles/files/50499161738.pdfIn PDF document text
    • https://ip-kamera-rendszer.nuttydog.hu/ckfinder/userfiles/files/lopetevegotafapuxul.pdfIn PDF document text
    • https://wurstfargo.com/wp-content/plugins/super-forms/uploads/php/files/7ea02e1187ee983e64ed3e46a0323032/muwejeriza.pdfIn PDF document text
    • https://naves.cz/res/file/52671277598.pdfIn PDF document text
    • https://www.peeryhotel.com/wp-content/plugins/super-forms/uploads/php/files/2e9f2293b2af87e56474d6ec8b251d9b/47970309283.pdfIn PDF document text
    • https://kokomanis.com/contents/files/gukerekadidawopifito.pdfIn PDF document text
    • http://lamekatus.com/uploads/ckeditor/files/fusevidigofa.pdfIn PDF document text
    • http://jadever.vn/Images_upload/files/44325335412.pdfIn PDF document text
    • https://kebecelectrique.com/upload/editor/file/fawubedapoxujozewazinis.pdfIn PDF document text
    • http://abnigakgdsg.friendship-match.com/upload/files/babuxobarijito.pdfIn PDF document text
    • https://slavica.ru/wp-content/plugins/super-forms/uploads/php/files/bc55fee135874b4bf49f993df17b9038/majakijakonimusowos.pdfIn PDF document text
    • http://plenar.hr/wp-content/plugins/formcraft/file-upload/server/content/files/16145037f300c4---17546979148.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613aa8c6d50f5---73910153415.pdfIn PDF document text
    • http://kinel-hunter.ru/upfiles/file/31884804682.pdfIn PDF document text
    • https://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/161316949a4166---beketewiw.pdfIn PDF document text
    • https://bisnismedsos.com/userfiles/file/577907368.pdfIn PDF document text
    • http://hoteldazegliotorino.com/userfiles/files/ginoliv.pdfIn PDF document text
    • http://pasquarelloplumbing.com/UserFiles/file/nanalaban.pdfIn PDF document text
    • https://lesura.net/userfiles/file/83250233724.pdfIn PDF document text
    • https://smartech.lv/sites/smartech/uploads/documents/files/67708317551.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_off0000ca7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA7E 17456 bytes
SHA-256: f32a905dc36657f4ad291e707d0b4faef9e8f4bde1caa03166db34b3c7ed4013
font_01_sfnt_off0000f700.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF700 10668 bytes
SHA-256: 17ffa1932d5001bb32524b5452b47842b7cb51f344c0cd4280980551435a6986
font_02_sfnt_off00010f29.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F29 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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