Malicious PDF — malware analysis report

Static analysis result for SHA-256 fb71a6504d1b47df…

MALICIOUS

PDF

87.3 KB Created: 2021-09-18 17:48:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 46c2303bf686d1dd6386ab93c68412b5 SHA-1: aa9f51f6c13ad9c290e33e5c114cf20a432d5450 SHA-256: fb71a6504d1b47df488cc5d706cce82aa07a547c753a70931dd8e2ce5a5f904d
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple links to compromised WordPress sites, indicating an attempt to host malicious content. The 'SE_CALLBACK_LURE' heuristic strongly suggests a callback phishing or tech-support scam, where the user is prompted to call a fraudulent number. The ML classifier and ClamAV detection further confirm the malicious nature of the document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://unitedcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613eae854fe7a---dadanogizuwavovebubejijo.pdf In PDF document text
    • http://bk-plus.at/userfiles/files/4347824923.pdfIn PDF document text
    • http://pokorny-podlahy.cz/UserFiles/File/gutowemiporadiv.pdfIn PDF document text
    • http://pozitron-s.ru/userfiles/file/41441969086.pdfIn PDF document text
    • https://u-spot.biz/js/ckfinder/userfiles/files/27342266524.pdfIn PDF document text
    • http://www.tobywells.org/media/fckdir/file/17395654939.pdfIn PDF document text
    • http://pampa.be/uploads/userfiles/files/netugi.pdfIn PDF document text
    • https://sv-fin.ru/wp-content/plugins/super-forms/uploads/php/files/c376f96e4d131ed2ba28491a197118aa/supakabopuw.pdfIn PDF document text
    • http://paramountswimwear.com/userfiles/files/9559264184.pdfIn PDF document text
    • https://digbijoynath.in/uploads/userfiles/files/rosuxobatobebipuda.pdfIn PDF document text
    • https://loctra.net/userfiles/file/bodijalosufe.pdfIn PDF document text
    • http://www.majoriscambio.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16135fa24015df---lufawumalom.pdfIn PDF document text
    • http://premiumresourcing.com/wp-content/plugins/formcraft/file-upload/server/content/files/161449d7d7e3bf---baxigizotuxafagutudetun.pdfIn PDF document text
    • http://anquocrealty.com/uploads/image/files/luwinaruvitavumigafuluxa.pdfIn PDF document text
    • http://bobas24.pl/Upload/file/68492778760.pdfIn PDF document text
    • http://iwayman.com/uploadfiles/file/2109091150106002861mvgpd.pdfIn PDF document text
    • http://girlstown.org/files/js/ckfinder/userfiles/files/nonesof.pdfIn PDF document text
    • http://gcoekmr.org/cukashmir/User_Files/imagefile/30377072217.pdfIn PDF document text
    • http://geriatriccarenewjersey.com/userfiles/files/42428628998.pdfIn PDF document text
    • http://elazentrale.de/images/uploaded/file/tasigalosavifazuraditadu.pdfIn PDF document text
    • http://www.gainerwindows.ca/wp-content/plugins/super-forms/uploads/php/files/2aofi6muc21sbroedojd3n4fu6/29332517230.pdfIn PDF document text
    • http://medtravel.lv/images/hand_uploaded/files/67823154508.pdfIn PDF document text
    • http://nacyc.jp/Upload/file/94962219685.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=deezer+music+player+apkPDF link annotation
    • https://www.thc.gda.pl/ckfinder/userfiles/files/nedorabidilitemanivevedi.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_off0000ed51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED51 10580 bytes
SHA-256: df5f7716a5fc9dd746746b796fcc91d4c07b396f2c9f8022043dcb067404b7f6
font_01_sfnt_off0001059d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1059D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011daf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DAF 18976 bytes
SHA-256: efa84f12738e43d6447592a8d16f5859a684b3aed9cda3fc91055e4e67a30946

Open this report in the interactive analyzer, or submit your own file for analysis.