Malicious PDF — malware analysis report

Static analysis result for SHA-256 75ae989480988df7…

MALICIOUS

PDF

74.1 KB Created: 2021-09-04 03:46:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: ac75c25d55c15e0b5d81b70b6a89c87d SHA-1: 044d5ea6abeb711e287bca0edcdc686d7ca49c2f SHA-256: 75ae989480988df7836f1c0e1f29f38fbf2dd58f7a434a5ee567daf6b8d48da3
156 Risk Score

Malware Insights

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

The PDF contains a large number of links, many of which point to websites hosted on compromised CMS platforms or disposable hosting, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://residencecarlofelice.com/userfiles/files/39672177747.pdf In PDF document text
    • https://securityguardsupply.com/php/uploads/file/85662730051.pdfIn PDF document text
    • http://bephoangdung.vn/uploads/ckfinder/files/39067839450.pdfIn PDF document text
    • http://www.museopizarra.com/ckfinder/userfiles/files/78746908299.pdfIn PDF document text
    • https://www.superioreagle.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079fe89d4b07---23661068483.pdfIn PDF document text
    • http://aarogyamedico.com/userfiles/file/kezuwenopexutikifa.pdfIn PDF document text
    • https://dezsredstvompx.ru/wp-content/plugins/super-forms/uploads/php/files/90f7c40c3ca9bbcf0cb2b9e545d0b2c1/masojizolezuduse.pdfIn PDF document text
    • http://www.trafikyaren.com/wp-content/plugins/super-forms/uploads/php/files/q4k433sgo7tv0m1n4uherlbgm2/sasibufujigite.pdfIn PDF document text
    • http://xn--939a66v0zjo3bcvdmrp.com/data/ckfinder/files/zulorupoke.pdfIn PDF document text
    • https://saraelv.no/wp-content/plugins/formcraft/file-upload/server/content/files/160a7b9ff8a721---jubigizesivegadogidoj.pdfIn PDF document text
    • http://ac-kenigsberg.ru/files/file/36864833013.pdfIn PDF document text
    • https://powermailer.in/userfiles/file/78224585415.pdfIn PDF document text
    • http://oxigensupplies.com/shipinc/userfiles/files/63031387414.pdfIn PDF document text
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/a4ec9398e94d7f2d555cab1ae7a344e9/fifijusuje.pdfIn PDF document text
    • https://estoniapools.com/contents//files/wimekus.pdfIn PDF document text
    • https://spectrumohio.com/wp-content/plugins/super-forms/uploads/php/files/193e8e70447ecf02087f68321b6d7626/tutufebowexofavikut.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/oofau2s6cprems2rtls86e0m54/vinow.pdfIn PDF document text
    • http://hy-concrete.ru/d/files/78059649394.pdfIn PDF document text
    • http://hak-al.com/resimler/files/97156515357.pdfIn PDF document text
    • http://lukoilmarine.com/ckfinder/userfiles/files/kijelulafozabidogudo.pdfIn PDF document text
    • http://www.sensible-seeds-premium.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086f157eab0a---81899575888.pdfIn PDF document text
    • https://vizzzio.ru/wp-content/plugins/super-forms/uploads/php/files/9daf6b4f48f76c5a3eeda7ed6d6bed71/43071235866.pdfIn PDF document text
    • https://www.denisonlandscaping.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b26de42c500---15302989183.pdfIn PDF document text
    • http://duszek-lasu.pl/userfiles/file/48766017812.pdfIn PDF document text
    • https://kraftyz.in/ckfinder/userfiles/files/vuxixabovarovef.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=escoliosis+congenita+en+ni%C3%B1os+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_off0000bda8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBDA8 10884 bytes
SHA-256: 454b11abf305ee3617c033f44a813dabc89f14b2bf1c6dbd653d0ea844942fe7
font_01_sfnt_off0000d679.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD679 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ee8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE8B 16860 bytes
SHA-256: 036e8f9552bf88fd60ff1b82b9502abb52f39bd8c4c40ad85170412b41bbb7ff