Malicious PDF — malware analysis report

Static analysis result for SHA-256 8eaebdec55388382…

MALICIOUS

PDF

66.5 KB Created: 2021-09-19 22:14:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 80d6e62a032209ee29db965fc7446f68 SHA-1: cda507e3333668480b18618207f8b934b084a2c8 SHA-256: 8eaebdec5538838255c48357f9bd49763f5a4862d8460f9487be58083eb97870
124 Risk Score

Malware Insights

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

The file was detected as a phishing trojan by ClamAV. Static analysis revealed it functions as a link farm, with numerous embedded URLs pointing to potentially compromised WordPress sites. These links are designed to lure users into downloading further malicious content or visiting phishing pages.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.4539

Heuristics 5

  • 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
  • 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://principessavencanice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16143a83fa74fd---49940895037.pdf In PDF document text
    • https://myphambambi.com/webroot/img/files/88806327272.pdfIn PDF document text
    • http://nacyc.jp/Upload/file/nufore.pdfIn PDF document text
    • http://handinks.com/ckfinder/images_store/files/65329935257.pdfIn PDF document text
    • http://www.leasebridge.com/CKUPimg/files/28109595615.pdfIn PDF document text
    • https://butzbacher.turnpoint.jo/app/webroot/upload/files/zodot.pdfIn PDF document text
    • http://polyacer-ecp.com/userfiles/files/20210918_164344.pdfIn PDF document text
    • https://monographie.com/ckfinder/userfiles/files/lomeli.pdfIn PDF document text
    • https://www.db-ynox.fr/ckfinder/userfiles/files/53066876520.pdfIn PDF document text
    • https://888nv.ru/userfiles/file/12090958681.pdfIn PDF document text
    • http://microcement.ua/userfiles/file/46761167381.pdfIn PDF document text
    • http://runwellconsulting.eu/file/file/46261016738.pdfIn PDF document text
    • http://muabannhagiare.net/images/uploads/files/zejoru.pdfIn PDF document text
    • http://eros-arena.com/eros/userfiles/file/79570999235.pdfIn PDF document text
    • http://konditsionery-reutov.ru/upload_picture/file/falagen.pdfIn PDF document text
    • http://www.biogreeno.com/cms/ckfinder/userfiles/files/laxerep.pdfIn PDF document text
    • http://radio-salsa.com/php/rs/filesupload/file/torakej.pdfIn PDF document text
    • http://uekekb.ru/!upload/files/zidisuxefepajo.pdfIn PDF document text
    • http://www.urbanwaterways.info/files/68456932107.pdfIn PDF document text
    • http://kht.civilkozpont.hu/uploads/file/dukepedob.pdfIn PDF document text
    • https://xn--1--8kcai1ck2bs.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/a63e3553bad278a2e44a7b38f43f796a/56074024071.pdfIn PDF document text
    • http://ganan10.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1613e40cf9513f---79182888859.pdfIn PDF document text
    • http://madmojo.com/fckupload/file/96198213418.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=james+stewart+calculus+7th+solution+pdfPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d785.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD785 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ef9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF9C 11112 bytes
SHA-256: 349bb3feb8ea6b7e5e690377df035e2ea53f9378e1bde55091e1add40f4621ae

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