Malicious PDF — malware analysis report

Static analysis result for SHA-256 9288b82ff29df725…

MALICIOUS

PDF

70.8 KB Created: 2021-09-25 07:43:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 3a2d1a9cbdb25c06a2aa4581867b04c6 SHA-1: 92584047735c5969213e1c1e638f3a2cdf40539c SHA-256: 9288b82ff29df7255310b246e085761b8a2038eba386b41125f9644a856ef64e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by ML classifiers and ClamAV as malicious. It contains a link farm pointing to multiple domains, including compromised WordPress sites, suggesting an attempt to redirect users to malicious content. The PDF structure itself is also noted as having duplicate object bodies, which can be used to obfuscate malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://full814.com/upload/files/3212985453.pdf In PDF document text
    • http://feach.ie/images/uploads/file/pajol.pdfIn PDF document text
    • https://hotelritariccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/16139206b1f4d9---32305370971.pdfIn PDF document text
    • http://kaies.net/upfiles/2109051900280051821xw840.pdfIn PDF document text
    • http://stolizstekla.ru/userfiles/file/59721563854.pdfIn PDF document text
    • https://kirmatas.com/userfiles/file/47459143808.pdfIn PDF document text
    • http://orourkelawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/21203531088.pdfIn PDF document text
    • http://lexuspolymers.com/assets/ckfinder/userfiles/files/69320541136.pdfIn PDF document text
    • https://floresdeserrezuela.com/aym_image/files/jolulusaroposorenidutuzeg.pdfIn PDF document text
    • http://foxadv.net/file/sijinaw.pdfIn PDF document text
    • http://southportrubbish.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136648a55c3a---tebotebezitovojase.pdfIn PDF document text
    • http://worldsocialistpartyindia.org/ckfinder/userfiles/files/12423537777.pdfIn PDF document text
    • http://ets-sptk.ru/pic/file/53033799822.pdfIn PDF document text
    • http://pomodorolennep.de/gfx/userfiles/files/16819525742.pdfIn PDF document text
    • https://phoenixturkey.com/upload/ckfinder/files/82395704928.pdfIn PDF document text
    • http://f-okinawa.com/img/tmp/files/38811001481.pdfIn PDF document text
    • https://www.hosotte.com/ckfinder/userfiles/files/50521963290.pdfIn PDF document text
    • https://neoville.ru/wp-content/plugins/super-forms/uploads/php/files/1d11d728f6cda4d433ac9f22b4f2f26d/20564141941.pdfIn PDF document text
    • http://wizclub.net/upload/userfiles/file/mopusirajafofasaxonun.pdfIn PDF document text
    • http://quaint-house.com/images/blog/file/zirumibowosowe.pdfIn PDF document text
    • https://portecitadelle.portecitadelle.ca/ckfinder/userfiles/files/jivovitujebutujetuvo.pdfIn PDF document text
    • http://cungcapbaoduongcuanhatban.com/upload/files/9852421317.pdfIn PDF document text
    • http://2sisaccount.com/userfiles/files/99285592112.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=religious+emojis+for+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_off0000b24d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB24D 16452 bytes
SHA-256: c6305167609372cb635ab52829c926f774519ff430246b3b34d5b956959c3f77
font_01_sfnt_off0000dc81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC81 10872 bytes
SHA-256: 2a960ee72d2545013389a073e07b52c085491af918d32c793d58f39d289164f1
font_02_sfnt_off0000f557.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF557 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1