Malicious PDF — malware analysis report

Static analysis result for SHA-256 5bac94b90d3304af…

MALICIOUS

PDF

95.6 KB Created: 2021-09-07 12:08:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: d8cb4b9ec99aa2309f0c4acfa454bd20 SHA-1: a9c23ee1cc966de31f3ae4c8846b7a5ed182a611 SHA-256: 5bac94b90d3304af5c9407ef0e7a94d30da2c74bf1a4a6cb0fa0cf57b6d8d914
196 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised WordPress sites, indicating a link farm designed to host malicious content. The ClamAV detection and ML classifier strongly suggest this PDF is malicious, likely serving as a lure for phishing or to download further malware. The presence of multiple external URIs and compromised CMS uploads points to a coordinated effort to distribute malicious files.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9820

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://dipinkrishna.com/wp-content/plugins/formcraft/file-upload/server/content/files/160720c91b88ba---tebinutewozub.pdf In PDF document text
    • http://vipnjl.com/userfiles/files/44681607527.pdfIn PDF document text
    • https://amesmedicalservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a49ce9f127e---900488640.pdfIn PDF document text
    • https://shotclock.ca/wp-content/plugins/super-forms/uploads/php/files/743d1f91a51d4edf03772b7c326f1d4c/wagozupoxi.pdfIn PDF document text
    • http://hi-reid-solutions.com/wp-content/plugins/super-forms/uploads/php/files/08e2e3ad40447ec74042c1a38e21f7d3/rurizevagagukuwujamu.pdfIn PDF document text
    • https://libertyrealestate.in/ckfinder/userfiles/files/xejaniburimipigakipus.pdfIn PDF document text
    • http://www.photonics-science.com/ckfinder/userfiles/files/paguwopomurebol.pdfIn PDF document text
    • https://hmjrgoldhockey.org/wp-content/plugins/super-forms/uploads/php/files/a816e5e759d93fbc3597f33014b28f32/tevofetetiwi.pdfIn PDF document text
    • http://sinproval.it/userfiles/files/nakusez.pdfIn PDF document text
    • https://www.kadinlarsitesi.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c199606b6b5---lijodetekenupoked.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/ck7ghb6alhlp9vkp5i3bb5j960/wewinijus.pdfIn PDF document text
    • http://loveforlungs.com/clients/a/a9/a9a80f3a93b7553e0860ec1960497db0/File/15952474301.pdfIn PDF document text
    • https://chicagoportablexray.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f093ee9ffa---roratipo.pdfIn PDF document text
    • https://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b6568a9f33f---somixodejesewara.pdfIn PDF document text
    • https://www.acta-mobilier.fr/ckfinder/userfiles/files/48499376152.pdfIn PDF document text
    • https://giridhareye.org/ckfinder/userfiles/files/42645375671.pdfIn PDF document text
    • https://bbpartner.cz/userfiles/file/segeloji.pdfIn PDF document text
    • http://sweethomedelivery.com/ckeditor/ckfinder/core/connector/php/uploads/files/65340846642.pdfIn PDF document text
    • https://kakvkusno26.ru/wp-content/plugins/super-forms/uploads/php/files/7cec0caed03863137f7afed99a4da05c/kipenalexesezu.pdfIn PDF document text
    • http://www.restorationservice.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160778e6a7e9e2---51487786192.pdfIn PDF document text
    • https://bettenbaehren.de/wp-content/plugins/formcraft/file-upload/server/content/files/160be9a2ac9854---55038946058.pdfIn PDF document text
    • http://skikk.eu/app/webroot/files/userfiles/files/fimanedodelo.pdfIn PDF document text
    • https://www.northwoodmedical.ca/wp-content/plugins/super-forms/uploads/php/files/59ou7t4iqvavrqvlvvfo2cr5b1/tofajobomijijen.pdfIn PDF document text
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/55rtfcgpd7l3jl82t2op3lmh96/90102256584.pdfIn PDF document text
    • http://brightwayconsultancyservices.com/userfiles/file/85697048955.pdfIn PDF document text
    • http://uptownchantilly.com/uploads/files/zidemonujeterolig.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=tlc+chile+vietnam+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_off00010c5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C5F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00012471.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12471 20048 bytes
SHA-256: 9b59aed46174a694a29c38dee7acf605573077b49d034aed5a3f90a5297a8e6b
font_02_sfnt_off00015995.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15995 10528 bytes
SHA-256: 34532be03c0291a9eb75d374cde78eeb84e16214b4193b2d9ab9318b4c57a1bc

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