Malicious PDF — malware analysis report

Static analysis result for SHA-256 b87d874e3a2adcbf…

MALICIOUS

PDF

73.9 KB Created: 2021-09-18 17:04:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 56a3d2c65f2035e176b27e286e19d34d SHA-1: 023bfaf291f6df0c8310b58dd72e03e87acc1391 SHA-256: b87d874e3a2adcbffb0201d3df3538355ff4e9124954e965614a1074b72898d9
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs that point to compromised WordPress sites and other domains, identified by heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM'. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lure users to malicious sites for phishing or malware downloads. No scripts were extracted, and the document body was unreadable binary data.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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 http://fabrykakonwersji.pl/wp-content/plugins/super-forms/uploads/php/files/ab2c0e916ffdf4701ea316741f3e409a/32272178103.pdf In PDF document text
    • http://residencelesaline.it/userfiles/files/63778673307.pdfIn PDF document text
    • http://nc2e.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16138ffaa58a4f---27931692399.pdfIn PDF document text
    • https://biogenetixpharma.com/ci/userfiles/files/80222603013.pdfIn PDF document text
    • https://autosofortkauf.ch/wp-content/plugins/super-forms/uploads/php/files/0u3h0a1pojlanvglrvittvl159/21494234787.pdfIn PDF document text
    • http://shlawllc.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/66635861548.pdfIn PDF document text
    • https://www.profiemg.cz/upload/ck/files/86635812460.pdfIn PDF document text
    • http://cohn-vossen.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130c0a362b96---65924820372.pdfIn PDF document text
    • http://perilatomsk.ru/ckfinder/userfiles/files/wugumovaremewuvafidibodi.pdfIn PDF document text
    • https://prokoncept.hu/admin/blogfck/image/file/91443178587.pdfIn PDF document text
    • https://gtselect.fr/ckfinder/userfiles/files/xasavanuxegaramamulanoxas.pdfIn PDF document text
    • https://biorenta.lt/ckfinder/userfiles/files/12513364453.pdfIn PDF document text
    • https://sayurhijau.com/contents/files/jobekobizabeminoz.pdfIn PDF document text
    • https://sunridgecorp.com/uploads/files/202109132237599821.pdfIn PDF document text
    • http://quiltingacademy.info/fckeditor/userfiles/file/lejoma.pdfIn PDF document text
    • https://spa-salon.ru/ckfinder/userfiles/files/kisikeresuwubitod.pdfIn PDF document text
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/ecf000bc4bc6a68d3a40fb5fc21aaccd/dojepededidaxorinapovelov.pdfIn PDF document text
    • https://cezartravel.hu/userfiles/file/gimanube.pdfIn PDF document text
    • http://cee1968.com/ckfinder/userfiles/files/18030925747.pdfIn PDF document text
    • http://nawarashop.com/phya/ckfinder/userfiles/files/vemezigozopudadumidukexo.pdfIn PDF document text
    • https://etravelbox.com/scgtest/team-explore/uploads/files/bupativokabukusoxofus.pdfIn PDF document text
    • http://studiogaleazzo.eu/userfiles/files/bokopifa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=redmi+note+10+pro+max+bluetooth+versionPDF 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_off0000b9ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB9AD 17792 bytes
SHA-256: 25318a5c34f898cfa7d1a0b17b3ac468381c9387a599c4afaf4f984d4236a0db
font_01_sfnt_off0000e85d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE85D 11284 bytes
SHA-256: b74c97a7072c82bc60da538617c9c5d1603ab620fbf5157033434d7a60e916d5
font_02_sfnt_off0001027d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1027D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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