Malicious PDF — malware analysis report

Static analysis result for SHA-256 9c0b7973f489589b…

MALICIOUS

PDF

81.3 KB Created: 2021-09-17 12:50:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 4da168ed7c57e6fe331aa83af3f38bfe SHA-1: 4d86b733b78043570260bbbbd93c3c07dff7260c SHA-256: 9c0b7973f489589b82cd4249d1b3e578221356de9423a49a4ac27b223a6028ed
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many pointing to compromised WordPress sites or disposable hosting, indicating it functions as a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The presence of multiple external URIs and link farms points towards an attempt to redirect users to malicious content.

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 https://catamma.ru/uplcv?utm_term=gems+from+the+equinox+pdf PDF link annotation
    • http://cobmedia.hu/include/98421443437.pdfIn PDF document text
    • http://sadiqandsons.com/userfiles/files/41081873846.pdfIn PDF document text
    • https://technok.cz/wp-content/plugins/super-forms/uploads/php/files/f2c9c4eccafa2862dbb1e1342e1bc6d3/61255308872.pdfIn PDF document text
    • https://patc.fr/imagesfile/difobafuruvatijerevibu.pdfIn PDF document text
    • http://dr-onesrl.com/userfiles/files/32781927986.pdfIn PDF document text
    • http://velapower.com/glwh/UploadFile/file/2021090917211673499.pdfIn PDF document text
    • http://byty-pardubice.eu/UserFiles/File/87379031547.pdfIn PDF document text
    • http://agataklimowska.pl/userfiles/file/71271662271.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613f127c6b6d7---23317946194.pdfIn PDF document text
    • https://infotechsystemsonline.com/ital/www/img/file/jaxate.pdfIn PDF document text
    • http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613043286d2cf---2295509555.pdfIn PDF document text
    • http://sinara.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613ec644476e6---46580147875.pdfIn PDF document text
    • http://bandbaajabarat.com/ci/userfiles/files/49202758053.pdfIn PDF document text
    • http://yoron.net/up/files/30449263089.pdfIn PDF document text
    • https://regenerativetherapyforpain.com/wp-content/plugins/super-forms/uploads/php/files/9ecdb38a64d728335ab30ce44747bd56/24449225731.pdfIn PDF document text
    • https://interconformity.ro/images/file/43314140311.pdfIn PDF document text
    • http://lawngo.net/fckfiles/80523209991.pdfIn PDF document text
    • http://deeringbayrealestate.com/userfiles/files/82475764148.pdfIn PDF document text
    • http://churchontherockuk.org/home/churchontherock1/public_html/userfiles/files/lujofegefaninafa.pdfIn PDF document text
    • https://vietnaminsight.biz/ckfinder/userfiles/files/50041490936.pdfIn PDF document text
    • https://www.agencesramos.com/ckfinder/userfiles/files/97248422494.pdfIn PDF document text
    • http://getampedmag.com/ckfinder/userfiles/files/muzilibubo.pdfIn PDF document text
    • http://dawahcity.com/userfiles/file/50127440642.pdfIn PDF document text
    • https://imagebeaute.fr/userfiles/file/57192536552.pdfIn PDF document text
    • 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_off0000d7b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7B4 17732 bytes
SHA-256: 7d089c084cabede5d0afe2d52d5f664ddf2fb6fb6ae9ede082bdca06ed1e9f45
font_01_sfnt_off00010634.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10634 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011e4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E4B 10944 bytes
SHA-256: 6d412025dc868a5d0d35b7e449cb107ae2117707f2ae5a1f81ba77dc07d9dff6

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