Malicious PDF — malware analysis report

Static analysis result for SHA-256 9cff6f973567f2d9…

MALICIOUS

PDF

83.0 KB Created: 2021-09-05 02:35:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 21bd0c106f3dfb3c859f07ec9a2c70ae SHA-1: ea11c2ac60470b86aa49e58d12ef23f7115ac814 SHA-256: 9cff6f973567f2d91676b43a984dfc4c87e88a01df2740e0d74152476034e0ca
196 Risk Score

Malware Insights

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

The PDF contains multiple links pointing to compromised WordPress sites and disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The presence of external URIs and compromised CMS upload links points to an attempt to leverage these resources for malicious redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://www.hausbootgeiseltalsee.de/wp-content/plugins/super-forms/uploads/php/files/obfgf485nhvafscfgqvh7ejnbi/22865747449.pdf In PDF document text
    • http://www.garriagricola.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d85471a7663---61518043778.pdfIn PDF document text
    • https://kga-am-adlergestell-ev.de/kga/ckfinder/userfiles/files/lubunun.pdfIn PDF document text
    • http://lyzjkgm.com/d/files/zevepulugitar.pdfIn PDF document text
    • http://bjsprt.com/uploadfile/file///2021051920033117.pdfIn PDF document text
    • http://diegogenna.it/userfiles/files/sixaretogumizuzajadonet.pdfIn PDF document text
    • https://dfa-finanz.de/wp-content/plugins/formcraft/file-upload/server/content/files/16075a7dbb0696---39233848031.pdfIn PDF document text
    • https://www.naturartshop.com//ckfinder/userfiles/files/53585444697.pdfIn PDF document text
    • http://labsshop.com/d/files/lopovurenobazaxovofur.pdfIn PDF document text
    • https://maydongy.com/wp-content/plugins/super-forms/uploads/php/files/ohuh1hjgqjvl3qtcnii04dc133/wevuzonifalefaworitefe.pdfIn PDF document text
    • http://skrabl.pl/www/rpbd/fck/file/71758457792.pdfIn PDF document text
    • https://www.burit.net/wp-content/plugins/formcraft/file-upload/server/content/files/160b7e6087b6e7---99559188334.pdfIn PDF document text
    • http://hangtatmj.com/userfiles/63696758.pdfIn PDF document text
    • http://www.ponderosafestival.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e6eda1358c---5453076003.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/ripixomam.pdfIn PDF document text
    • http://chono.mn/uploads/userfiles/files/gikunulozilarif.pdfIn PDF document text
    • https://a2designbg.com/userfiles/file/38867745561.pdfIn PDF document text
    • https://lenaoyunlar.com/calisma2/files/uploads/runejigabil.pdfIn PDF document text
    • https://abeess.com/userfiles/file/sudiwakerojilufineraf.pdfIn PDF document text
    • http://veterinarioassociatopacinidallatorre.eu/userfiles/files/xaxunosided.pdfIn PDF document text
    • https://tonthephunglan.vn/upload/files/99368092198.pdfIn PDF document text
    • http://americusfelderfamily.com/clients/0/0c/0c5e5e27a4da9db51eb23c24aa0fa274/File/87297739511.pdfIn PDF document text
    • https://www.sahabatkeluargahomecare.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086874f83ae2---4478590502.pdfIn PDF document text
    • https://tavio.ru/files/file/wulupemopuleremonupabi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=visualisasi+kreatif+pdfPDF 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_off0000e245.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE245 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fa5c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA5C 10428 bytes
SHA-256: 29ee34acfd88e07e53470a37dd3ae5586fc00386bfc7e999c1d210af326427de
font_02_sfnt_off0001121f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1121F 17176 bytes
SHA-256: a487068c443c151cbc16c6a42d7690efe269067b47f69b26250f96e68aeb76d8

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