Malicious PDF — malware analysis report

Static analysis result for SHA-256 7ab7495c235423d8…

MALICIOUS

PDF

86.5 KB Created: 2021-09-17 15:11:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 1af42f2e03b571b275f286dc4235a2de SHA-1: 66f1054686880896706d3a14854ceff019eab550 SHA-256: 7ab7495c235423d805eb3a0542b2a8c031c48e88e6cae40a958a3c96790a214a
156 Risk Score

Malware Insights

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

The PDF contains a link farm with numerous URLs pointing to potentially compromised websites, as indicated by the 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' heuristics. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. The embedded URLs are designed to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

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://academiapreprod.riportico.com/userfiles/files/wipapixanunit.pdf In PDF document text
    • https://toliveinchristjesus.ceosale.catholic.edu.au/application/third_party/ckfinder/userfiles/files/xoxaga.pdfIn PDF document text
    • http://xaydungphongphu.com/uploads/files/79956090882.pdfIn PDF document text
    • http://labonscafe.com/userfiles/70594036911.pdfIn PDF document text
    • http://longarmquiltacademy.net/fckeditor/userfiles/file/duvavugusarekotez.pdfIn PDF document text
    • http://micruts.org/userfiles/file/95557484452.pdfIn PDF document text
    • http://essentielles-theater.de/UserFiles/File/53024037237.pdfIn PDF document text
    • https://selectwifi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613fc662430f5---48280012831.pdfIn PDF document text
    • http://ladyqueen.it/userfiles/files/dopajokumam.pdfIn PDF document text
    • https://tonere.shop/app/webroot/files/userfiles/files/68513126210.pdfIn PDF document text
    • http://admio.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1614465030f732---nosanodolikurow.pdfIn PDF document text
    • http://jinshi66.com/uploadfiles/files/powupinutug.pdfIn PDF document text
    • http://ruben.pl/ckfinder/userfiles/files/kenomovokuxiwikero.pdfIn PDF document text
    • http://arebiatours.com/uploads/files/karilifivalawobut.pdfIn PDF document text
    • https://glaskunstcentrum.nl/images/file/nowexew.pdfIn PDF document text
    • http://villaturri.it/wp-content/plugins/formcraft/file-upload/server/content/files/16135748596bca---28316728842.pdfIn PDF document text
    • http://e-district.org/userfiles/file/87684224518.pdfIn PDF document text
    • http://victorylimo1.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613fbc6feb06b---8136156069.pdfIn PDF document text
    • https://beautyyaurient.com/editor_upload/file/64070131812.pdfIn PDF document text
    • http://masan315.net/board/imagefile/file/66789078410.pdfIn PDF document text
    • https://nikunjfoundation.org/ckfinder/userfiles/files/boderape.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=how+to+rate+podcasts+on+androidPDF 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_off0000f0fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0FD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001090f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1090F 16524 bytes
SHA-256: 185e29c4802f0cc4627d93cb95cf7ed74f85f6f1d2d29f6f75edfc42b39fb9d3
font_02_sfnt_off0001341a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1341A 10536 bytes
SHA-256: b4c2e180d2910093c67330415ad51c8096ae301c54e27a5109edea5c38989dea