Malicious PDF — malware analysis report

Static analysis result for SHA-256 b4eefa26c654bd99…

MALICIOUS

PDF

70.1 KB Created: 2021-09-27 01:14:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: 7667479bea6329c0a1cf0003f7e2d7eb SHA-1: 3a2a7a08b4d962b4ae20a6d81f35455085caf4db SHA-256: b4eefa26c654bd991966649cde4b8058e3b14633f62b7f4450c06ed783a9dbbd
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to multiple unknown PDF files hosted on various domains, with one URL specifically targeting a compromised WordPress upload directory. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware via the linked documents. No scripts were extracted, but the structure and URL targets are indicative of a malicious lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9909

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://gennarimaq.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161462c9e02d1d---firoboritutokop.pdf In PDF document text
    • http://ysmenmidwestindia.org/uploads/userfiles/file/file/xemox.pdfIn PDF document text
    • http://sjzhtchem.com/upload/files/suvorilozotuwopominafa.pdfIn PDF document text
    • http://curry-box-deluxe.de/userfiles/file/wopasax.pdfIn PDF document text
    • http://sotel-perm.ru/site/file/86512121180.pdfIn PDF document text
    • https://winstar-tools.com/UserFiles/editor/file/fimenapewirin.pdfIn PDF document text
    • http://ikkosushi.com/uploads/files/64990066002.pdfIn PDF document text
    • https://ymvii.com/admin/upload/files/59148278940.pdfIn PDF document text
    • http://sheilahancock.net/blogfck/file/zififaxej.pdfIn PDF document text
    • http://vimbark.sk/editor_uploads/files/xokalurowolegikamuxiw.pdfIn PDF document text
    • http://xn--80aafbanafwvcftiqfecrg2a.xn--p1ai/pict/file/52057583328.pdfIn PDF document text
    • http://xlpe.net/Images_upload/files/topodopegasew.pdfIn PDF document text
    • https://vibanghanoi.com/uploads/files/55480842767.pdfIn PDF document text
    • http://dintainoodle.com/uploads/files/nofid.pdfIn PDF document text
    • http://kleinschaden.expert/userfiles/file/vimawevikiliwoluzivupovit.pdfIn PDF document text
    • http://pecsimutargygaleria.hu/files/file/bipumegajonagog.pdfIn PDF document text
    • http://skpizzasubs.com/uploads/files/90822449309.pdfIn PDF document text
    • http://ngnjl.com/userfiles/files/99141630657.pdfIn PDF document text
    • https://alpasol.e-giant.net/upload/files/nutadugokuwolejolugoxi.pdfIn PDF document text
    • http://yatros.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16150ece104f75---banofodo.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/16150410e37415---kaziboge.pdfIn PDF document text
    • http://quesnelfoundation.ca/userfiles/file/sodasiwikivegosizubi.pdfIn PDF document text
    • http://lexuspolymers.com/assets/ckfinder/userfiles/files/meniwuvajadubavedikuviged.pdfIn PDF document text
    • http://www.mariabeckmann.com/fotos/uploads/files/64713196134.pdfIn PDF document text
    • http://www.biosafety.biz/ckfinder/userfiles/files/33598685816.pdfIn PDF document text
    • http://globalfeedindustry.com/upload/files/jabomefozupo.pdfIn PDF document text
    • http://texinpack.com/uploadfile/file///2021091301182749.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=why+is+wifi+on+my+phone+so+slowPDF 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_off0000b5b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB5B6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cdc8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDC8 14760 bytes
SHA-256: 08cb5096abb6e49a06c5ac6266548677c79fc72d171bd8ea6e8a912299176366
font_02_sfnt_off0000f284.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF284 10456 bytes
SHA-256: dcd8e52bec601157ef957e05f8c6a04a4729b081441f0c3717fe024b88cff68c

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