Malicious PDF — malware analysis report

Static analysis result for SHA-256 388e284a32f01cbe…

MALICIOUS

PDF

83.6 KB Created: 2021-09-18 06:19:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: c4fa6f055063ec7369630a92acc1be55 SHA-1: 0e99aa9dbfc7232993c19fb3ca36762d7bb800a9 SHA-256: 388e284a32f01cbe0ef5dab38de9b6549132cc2a5aedd47e9b17fd178ab07d8e
196 Risk Score

Malware Insights

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

The sample was detected as malicious by ML classifiers and ClamAV, and exhibits characteristics of a payment redirection lure. It contains a link farm pointing to compromised CMS uploads and disposable hosting, suggesting an attempt to distribute further malicious content. No scripts were extracted, but the PDF structure and heuristics indicate a phishing or credential harvesting attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Payment redirection / bank-detail change lure high SE_PAYMENT_REDIRECT_LURE
    Document describes new or changed bank, wire, ACH, IBAN, SWIFT, or routing instructions — a high-value business-email-compromise pattern
  • 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://topbondtape.com/uploadss/file/24153619268.pdf
    • http://intelekt.biz/uploads/pages/files/3351825744.pdf
    • http://hoangnamjsc.com/upload/files/75622396569.pdf
    • http://lawcab.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613f740739eef---fojoferapagokazemul.pdf
    • https://flexi-cms.com/uploads/file/66781321734.pdf
    • https://baobiachau.com/luutru/files/zafepe.pdf
    • https://www.golddustdental.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613090f2e9c6b---33714415294.pdf
    • http://dreesmann-foto.de/userfiles/file/kisonekisedesutolula.pdf
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/cc8446b0f4341df58d077d94babb307a/mowixidolonoxuvu.pdf
    • http://websteravelandscaping.com/editorData/file/55458123902.pdf
    • http://lblussana.it/images/file/18479450786.pdf
    • http://wu-pao.com/upfiles/editor/files/dekoka.pdf
    • http://erfolgsapp.de/wp-content/plugins/formcraft/file-upload/server/content/files/16143588e6434a---bokunot.pdf
    • http://kommunikator.nu/demo/userfiles/file///felaletidasuwexal.pdf
    • http://wingmanresearch.com/userfiles/files/25268156699.pdf
    • http://bielwod.com/userfiles/file/50554310057.pdf
    • https://reifenscho.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613d41a29644f---24603070438.pdf
    • https://zoldlepes.hu/userfiles/file/36450338238.pdf
    • https://ourcampuswindow.com/ckfinder/userfiles/files/26031167414.pdf
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/pezitogo.pdf
    • http://baschin-heizung.de/meineBilderAlbertGrundschule/file/19941306025.pdf
    • https://gujaratisamajparis.org/upload/files/mebewevuratezarigid.pdf
    • https://umartravel.com/files/fasesarazetekovedeja.pdf
    • http://aqcorth.specialty-match.com/upload/files/61977978012.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=devel+x86+among+us+mod+apk
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e466.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE466 16792 bytes
font_01_sfnt_off0000fc78.bin
375a7c1f7d3b2517be7fd08add5cf1d6d6adebaa742909573a68bcd5c77e8b49
pdf-font-stream PDF embedded font (sfnt) at offset 0xFC78 16160 bytes
font_02_sfnt_off00012669.bin
00ccf358f95c20aa0b95fffc7b3d68f9539df6ac42b4fa26542c783f780eb7d8
pdf-font-stream PDF embedded font (sfnt) at offset 0x12669 11180 bytes