Malicious PDF — malware analysis report

Static analysis result for SHA-256 b6b4702ea468fdf7…

MALICIOUS

PDF

85.1 KB Created: 2021-08-24 06:47:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 50fed2a7472c4e2c5e48961f8b87dbfa SHA-1: a801d0d4270857044829cb88ffba23bd5bf4d936 SHA-256: b6b4702ea468fdf7979aefcd65d7aaf57d4f1bc609b531960da76bbb9cc4d2eb
156 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ClamAV and an ML classifier. It contains numerous links, many pointing to compromised WordPress sites, suggesting a link farm or phishing lure. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a pattern of using disposable hosting for these links, likely to evade detection and for SEO manipulation. The presence of external URIs and the overall structure strongly suggest an attempt to redirect users to malicious or deceptive content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 6

  • 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.
  • 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://robertmatzuzi-massagetherapist.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1611f00c49e402---wotewixetunuguzag.pdf In PDF document text
    • https://pavaniautismschools.com/wp-content/plugins/super-forms/uploads/php/files/s60t485k9b1jm0n94gklnanbap/51774257216.pdfIn PDF document text
    • http://www.lavalledesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fa1411fa23---35185890657.pdfIn PDF document text
    • https://aartipalette.com/userfiles/file/44548161762.pdfIn PDF document text
    • https://sofanet.ro/ckfinder/userfiles/files/birager.pdfIn PDF document text
    • https://nowackleverkusen.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609fe26517d5a---47600572164.pdfIn PDF document text
    • https://menlopark.com/wysiwygfiles/file/vamowivegukokokat.pdfIn PDF document text
    • http://grupophi.es/uploads/files/konirifiwos.pdfIn PDF document text
    • https://autoteam.in/ckfinder/userfiles/files/58160207345.pdfIn PDF document text
    • https://humanistbeauty.com/wp-content/plugins/super-forms/uploads/php/files/a3toftdt4bhl19r0qsnrt7c00m/54867336687.pdfIn PDF document text
    • https://soalmatematik.com/userfiles/file/desabotedofova.pdfIn PDF document text
    • http://www.vivelamusica.es/wp-content/plugins/formcraft/file-upload/server/content/files/1611775a2a1d5b---64926723295.pdfIn PDF document text
    • https://avenue102.com/uploads/file/87871116905.pdfIn PDF document text
    • http://massvt.sk/editor_uploads/system/files/surikinisagudonalu.pdfIn PDF document text
    • http://salt17.com/userfiles/files/39403026610.pdfIn PDF document text
    • https://www.birdandwildlifeteam.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078a91af2e75---vijudibovagu.pdfIn PDF document text
    • http://tai-yang.tw/taiyang/upload/file/momusitosagewof.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/37023497454.pdfIn PDF document text
    • http://brava-ekb.ru/userfiles/file/38985226350.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/67cvsvrj42f50s5eee26f1lsh2/zomugamozefagukibawume.pdfIn PDF document text
    • http://w-f-l.de/user_img/file/gotik.pdfIn PDF document text
    • http://www.fotografoeventimilano.com/wp-content/plugins/formcraft/file-upload/server/content/files/160af9816a29db---xewefe.pdfIn PDF document text
    • http://villaturri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f0795ba44c3---xupepog.pdfIn PDF document text
    • https://jjcfurnituremaker.com/userfiles/files/fodafijetuxuj.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/sbboj209jm9658jml5akinre46/makewipewag.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=how+to+find+a+slope+from+an+equationPDF 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_off0000e78d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE78D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ff9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF9F 17364 bytes
SHA-256: 18aef3cbc3aec59ed6f1806fe13468e47e1176692b48ae54f2bea99c7af65da4
font_02_sfnt_off00012d28.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D28 10980 bytes
SHA-256: be0533936bafeb324b365c77287ccbf594a3d10a2c0b96d620d501ce7435ef67