Malicious PDF — malware analysis report

Static analysis result for SHA-256 053d45dc5c8bf542…

MALICIOUS

PDF

89.1 KB Created: 2021-09-07 04:54:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-01
MD5: 39847c3f87f6e8650097bbfaafd788b0 SHA-1: adc190da0b6070adb3438bc92121d9016d9fcef9 SHA-256: 053d45dc5c8bf542fee41b4278c539a02b407250f8d54999d248972b3bea8fed
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://tsafar.ir/basefile/tsafarir/files/15356266919.pdf In PDF document text
    • https://dannysacademy.com/ckfinder/userfiles/files/83347991273.pdfIn PDF document text
    • http://conwaychristian.org/wp-content/plugins/formcraft/file-upload/server/content/files/160ae4213c96f0---jemolomo.pdfIn PDF document text
    • https://comtraining.cl/userfiles/files/88757321096.pdfIn PDF document text
    • http://voxel-avocats.fr/uploads/file/fejogo.pdfIn PDF document text
    • http://coinproject.com/userfiles/image/file/sosutigupotadojarajow.pdfIn PDF document text
    • http://clinical-pain.com/pds/userfiles/files/wuzusujerusip.pdfIn PDF document text
    • https://billard-hauri.ch/userfiles/file/46319207058.pdfIn PDF document text
    • https://k-kompany.ru/wp-content/plugins/super-forms/uploads/php/files/4c201760b7c7ca8f3ee2389c47e89bd8/57335411018.pdfIn PDF document text
    • http://hoaiduc.edu.vn/ckfinder/userfiles/files/jopurulubepi.pdfIn PDF document text
    • http://africa-emergence2019.com/userfiles/file/47374082606.pdfIn PDF document text
    • https://www.hintonassociates.com/wp-content/plugins/super-forms/uploads/php/files/2e4efeca74793ee0e22eb4f309f9a2be/8736640347.pdfIn PDF document text
    • http://saveondealz.com/ckeditor/ckfinder/core/connector/php/uploads/files/dofivowojafotosovevudi.pdfIn PDF document text
    • https://beribuket.ru/wp-content/plugins/super-forms/uploads/php/files/200242429bf6f687cc8cab8b058bae42/35796558986.pdfIn PDF document text
    • https://www.ppmcare.co.uk/wp-content/plugins/super-forms/uploads/php/files/7ipk38h6gm6lm1faklc35bq5j7/96412506676.pdfIn PDF document text
    • https://33mobility.net/uploads/files/radanexunogaxewaj.pdfIn PDF document text
    • http://jeugdopdewetenschapsagenda.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160fe640adc7db---vazinidujolibovepipe.pdfIn PDF document text
    • http://greenplanetnepal.com/userfiles/file/wuwazeduvefozogog.pdfIn PDF document text
    • http://123dvere.sk/files/file/muputufetipalikubaforu.pdfIn PDF document text
    • http://schodylux.pl/userfiles/file/65153363080.pdfIn PDF document text
    • http://parquessolaresdenavarra.com/userfiles/files/pamiwesoniwimugowupoxobaw.pdfIn PDF document text
    • https://bbgpiti.com/userfiles/files/9992418483.pdfIn PDF document text
    • http://rogo-rotterdam.nl/files/78201252760.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=applied+stochastic+processes+mario+lefebvre+pdfPDF 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_off0000ee1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE1C 20508 bytes
SHA-256: 5d2e84cd2580ebea216df3f3683760e377042ec1bd0d0fe042a1d06d21761dd7
font_01_sfnt_off000124a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124A8 10968 bytes
SHA-256: bcb47907e64db9027b5113ffca26f597ba12d1c2283c6f037ff048e2adcad46c
font_02_sfnt_off00013df2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13DF2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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