Malicious PDF — malware analysis report

Static analysis result for SHA-256 fa4d0cb6dda6354b…

MALICIOUS

PDF

72.0 KB Created: 2021-09-24 14:28:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 50af0d6e12cc5198fdb00a45239311d7 SHA-1: 492a283384e09f5abcc74f629c2fc3770a8ccc36 SHA-256: fa4d0cb6dda6354b407fe1e5cf0193694f5175f719dddb12bfc2f9be2a981752
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged by multiple heuristics, including a critical ClamAV detection for Pdf.Phishing.Trojan. The document body is heavily obfuscated, but the presence of embedded URLs and a heuristic indicating a callback lure strongly suggest a phishing or scam attempt. The document likely aims to trick the user into initiating a phone call, potentially leading to further social engineering or financial fraud.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 http://daimarconstrucciones.com/images/admin/file/zefoxoxel.pdf In PDF document text
    • http://witnesstherealist.com/wp-content/plugins/super-forms/uploads/php/files/bdfc38b6489ac128fa1ff546c9900ebe/8310006077.pdfIn PDF document text
    • https://sesconbs.org.br/ckfinder/userfiles/files/67635410102.pdfIn PDF document text
    • http://sloplast.com/userfiles/files/24780744960.pdfIn PDF document text
    • http://phongkhamthienhoa.org/images/files/12392064740.pdfIn PDF document text
    • https://marciasmithconsulting.com/wp-content/plugins/super-forms/uploads/php/files/9a8f83e21ce830cb6e9b7649127d3746/22844164875.pdfIn PDF document text
    • http://omonetach.pl/foto/ilustracje/file/biwap.pdfIn PDF document text
    • https://agribusiness.pk/wp-content/plugins/formcraft/file-upload/server/content/files/1613a9175617f2---29064112085.pdfIn PDF document text
    • http://avsa.org/sites/default/files/images/files/vebofezimodelamisegi.pdfIn PDF document text
    • http://sudeoksa.net/userfiles/file/20210921181938.pdfIn PDF document text
    • http://poliinc.com/upload/files/fasexokaparanefifonawefen.pdfIn PDF document text
    • http://timnhanhonline.net/upload/files/xekudelemediwofekob.pdfIn PDF document text
    • https://burgaseguros.com/userfiles/file/nuzipuvole.pdfIn PDF document text
    • http://888spirits.com/userfiles/file/71382722504.pdfIn PDF document text
    • https://bcm.es/files/galeria/files/duzetimerameki.pdfIn PDF document text
    • https://ihotel2b.com/upfiles/editor/files/tigilesevugote.pdfIn PDF document text
    • http://www.oomedia.com.tw/ckfinder/userfiles/files/xuvinor.pdfIn PDF document text
    • http://rtm-plus.com/ckfinder/userfiles/files/bojumelow.pdfIn PDF document text
    • http://gibisch.org/files/files/28903934602.pdfIn PDF document text
    • http://www.libroparlatolions.it/backoffice/ckfinder/userfiles/files/jajotagimodosim.pdfIn PDF document text
    • http://skisun.it/userfiles/files/zisiderevikadonitepuwuf.pdfIn PDF document text
    • http://jaqalsports.com/files/file/18859585580.pdfIn PDF document text
    • https://interconformity.ro/images/file/86990998769.pdfIn PDF document text
    • https://artenika.pl/fck/file/gakuzupafazoxevuzodig.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=can+i+charge+my+iphone+with+android+adapterPDF 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_off0000b2de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB2DE 10980 bytes
SHA-256: 9cd13e304320077f5eb9c574709a764a9a6de11340e23db3b87724e68675085a
font_01_sfnt_off0000cc0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC0E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e420.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE420 17944 bytes
SHA-256: eb9f2461201e94ce0b2825d16480a9f3515a1b1c64b58a384ce6b0cdf906442c

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