Malicious PDF — malware analysis report

Static analysis result for SHA-256 d5e21e47175656e2…

MALICIOUS

PDF

78.4 KB Created: 2021-09-01 21:16:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 9e844e6a0a7625da03cf683bb35d5fe6 SHA-1: ca13f22b8c8709f634c503db426e580483e16d27 SHA-256: d5e21e47175656e2075acc968d060c879f43c8381ab8585386fc1c7a55f01fd5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of embedded URLs, many of which point to compromised WordPress sites acting as link farms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of numerous links to potentially compromised CMS upload directories suggests an attempt to blend in with legitimate content while redirecting users to malicious destinations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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://maxim-catering.de/wp-content/plugins/super-forms/uploads/php/files/gjpi3461ap1l50as3ibhucdtml/52414729115.pdf In PDF document text
    • http://brothersaluminium.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/1608112381deaf---tuziputiviwekupi.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160c98ce108304---durawusapakaxa.pdfIn PDF document text
    • http://naturallabs.de/userfiles/file/93696099097.pdfIn PDF document text
    • http://www.putnamtaxi.net/wp-content/plugins/formcraft/file-upload/server/content/files/1609a0e52e6449---vefanoxogexijejiruf.pdfIn PDF document text
    • https://sibois.eu/userfiles/file/gosajuzikij.pdfIn PDF document text
    • https://ctsgroups.asia/images/file/697724173.pdfIn PDF document text
    • http://luxmeterthai.com/ckfinder/userfiles/files/74048829276.pdfIn PDF document text
    • http://yatros.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160c05dd5b3276---38151357215.pdfIn PDF document text
    • https://www.birdandwildlifeteam.com/wp-content/plugins/formcraft/file-upload/server/content/files/160771baf068e9---88190801485.pdfIn PDF document text
    • http://pavcargo.ru/wp-content/plugins/super-forms/uploads/php/files/33f2931edc00c2cabec5610bd832ca3c/sinugedululasakod.pdfIn PDF document text
    • http://kanchanaspa.com/ckfinder/userfiles/files/pozozutibege.pdfIn PDF document text
    • http://studiofapas.it/userfiles/files/kugovo.pdfIn PDF document text
    • http://www.caribbeandentist.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cec5455ac9---65347536365.pdfIn PDF document text
    • https://www.havanasalsa-dance-tours.com/wp-content/plugins/super-forms/uploads/php/files/cfe1566a933ff44e49f72878b39c443d/38200259413.pdfIn PDF document text
    • https://hogies.com/includes/template/uploads/file/54808009819.pdfIn PDF document text
    • http://aj-freight.com/ckfinder/userfiles/files/97968487750.pdfIn PDF document text
    • http://jonkmp.nl/img/cms/file/71743995332.pdfIn PDF document text
    • http://fcraregistration.com/UploadedData/file/82908528719.pdfIn PDF document text
    • https://ntc-container.com/upload/files/xalutinonarevivemopubetex.pdfIn PDF document text
    • http://henri-ruch.ch/doc_pub/file/jelezipesanufidekezosi.pdfIn PDF document text
    • http://www.psstrecno.sk/wp-content/plugins/formcraft/file-upload/server/content/files/1606f42513fc66---27037595688.pdfIn PDF document text
    • http://amon-syotengai.com/userfiles/file/fedom.pdfIn PDF document text
    • http://eventclub.pl/userfiles/file/97833754931.pdfIn PDF document text
    • http://www.afamaresme.org/wp-content/plugins/formcraft/file-upload/server/content/files/16115001450a34---menakofoxidulavar.pdfIn PDF document text
    • http://thietbixanh.net/uploads/files/dibupa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=tle+module+grade+10+cookery+pdf+downloadPDF 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_off0000ce45.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE45 16400 bytes
SHA-256: 6e1f3d9d28faf80415645e3ebf7e47519e32bd7797042f7d7ff4a5a214919c71
font_01_sfnt_off0000f886.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF886 11132 bytes
SHA-256: ca964feaf398a25ca1ac4f98202187b961e1c8e54216ffb29bdf70c046e258f1
font_02_sfnt_off00011265.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11265 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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