Malicious PDF — malware analysis report

Static analysis result for SHA-256 9c914f535cf4baa9…

MALICIOUS

PDF

92.5 KB Created: 2021-09-01 10:51:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: edf2a61b6ae0786e67f2aece66618661 SHA-1: e45b49fbf73f158d52a008eb6dd425566cf6f2dc SHA-256: 9c914f535cf4baa94d6a6d02f0164cce5191c528cf56d0c2b5b4ccf498069943
156 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, indicating a high likelihood of malicious intent. It contains a link farm pointing to compromised CMS upload storage and disposable hosting, suggesting an attempt to redirect users to malicious content. The presence of multiple PDF files hosted on various domains, often within plugin directories like 'formcraft', points towards a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 6

  • 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 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://llibreriaha.com/img/events/file/55194329776.pdf In PDF document text
    • http://dagmar-e.de/userfiles/file/44332665723.pdfIn PDF document text
    • https://residenciasanamaro.es/userfiles/files/51386020951.pdfIn PDF document text
    • http://wakingbeauty.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098c1d458801---53531080805.pdfIn PDF document text
    • http://diversecityuk.com/userfiles/file/dizovevuvatikamatoti.pdfIn PDF document text
    • http://bora.su/ckfinder/userfiles/files/zirut.pdfIn PDF document text
    • https://alcoquimicos.com/ckfinder/userfiles/files/wokorewepefevo.pdfIn PDF document text
    • https://parokisantolukas.org/Uploads/userfiles/files/59703744333.pdfIn PDF document text
    • https://minutesnap.com/wp-content/plugins/super-forms/uploads/php/files/f9b420830a9d583efa7e3ddc68bb0e60/51061741580.pdfIn PDF document text
    • http://www.anapharmata.hu/ckfinder/core/connector/php/files/kituremedenawuvofulamod.pdfIn PDF document text
    • https://hightechrustremovers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609a9c90127e8---61074502614.pdfIn PDF document text
    • http://maekuangudomthara.com/ckfinder/userfiles/files/mugiran.pdfIn PDF document text
    • http://sumtinathholidays.com/admin/uploadfiles/file/zowebol.pdfIn PDF document text
    • http://www.linkkorea.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/160813fca4d50c---fedewidititazogisi.pdfIn PDF document text
    • http://aktifbant.com/resimler/files/tapidobunalozopoxopo.pdfIn PDF document text
    • http://quaretti.it/userfiles/files/42930477889.pdfIn PDF document text
    • https://best-turbos.com/wp-content/plugins/super-forms/uploads/php/files/59811e8fb571072dbc613b90070c188a/zibejobarexe.pdfIn PDF document text
    • http://geology.ie/wp-content/plugins/formcraft/file-upload/server/content/files/160a557b485421---wanopi.pdfIn PDF document text
    • http://aqs-group.it/userfiles/files/2247713867.pdfIn PDF document text
    • http://7166867.ru/ckfinder/userfiles/files/13767488695.pdfIn PDF document text
    • http://www.oknookna.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160c2b63d1a79e---5528278680.pdfIn PDF document text
    • https://southafricapools.com/contents/files/nekubupegedaru.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=online+liquor+deliveryPDF 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_off0001040d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1040D 18240 bytes
SHA-256: 03fdeae7b8d55e7198c1a4900fb438ef60884395a89ea4fc0ae17518843e8013
font_01_sfnt_off0001338b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1338B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014ba2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14BA2 10264 bytes
SHA-256: e938fc74197e1fcbfc4c0eaeebd06569ebfda7457e9425de82b76eff590d18d3

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