Malicious PDF — malware analysis report

Static analysis result for SHA-256 f2cae7a344b07797…

MALICIOUS

PDF

70.6 KB Created: 2021-09-07 21:15:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 90318e974a1fd4314d35d07b399c7087 SHA-1: c447321c28a7168a71bb09b560dff78cce911572 SHA-256: f2cae7a344b0779701e25635d6a76b51aac87449005ed88a1bc5c23333076002
156 Risk Score

Malware Insights

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

The PDF was flagged by a machine learning model and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to compromised WordPress upload directories or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The document body is heavily obfuscated and unreadable, providing no direct user-facing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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 http://datong-travel.tw/upload/ckeditor/files/20210705151115.pdf In PDF document text
    • http://pinxedien.net/upload/files/jadasulunowuwow.pdfIn PDF document text
    • https://lightupalife.org.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160c92a4a56fc0---moruvutare.pdfIn PDF document text
    • https://otelnamore.com/wp-content/plugins/super-forms/uploads/php/files/561ef4c92314d25c68d91d4273c28503/givisudejejabemifav.pdfIn PDF document text
    • https://atlantidegattico.it/file/25109001434.pdfIn PDF document text
    • http://www.leasebridge.com/CKUPimg/files/jaramaxez.pdfIn PDF document text
    • https://sklep-pinokio.pl/web/uploads/files/nemoximulomu.pdfIn PDF document text
    • https://www.ideaklinikbakirkoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa98e17c892---52756764760.pdfIn PDF document text
    • http://antik-cafe-bergen.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609053884c24b---18824008701.pdfIn PDF document text
    • http://peaceinsrilanka.lk/userfiles/file/86676764099.pdfIn PDF document text
    • https://bhandarisurgical.com/ckfinder/userfiles/files/54839127568.pdfIn PDF document text
    • http://fantasypartyentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afadfc30f4f---32178900203.pdfIn PDF document text
    • http://dabaizhongxue.com/upload_fck/file/2021-7-30/20210730203327899585.pdfIn PDF document text
    • http://stl-hk.net/userfiles/gukolo.pdfIn PDF document text
    • https://folklorebridge.eu/uploads/pictures/files/40888721298.pdfIn PDF document text
    • http://ozcetinler.com/userfiles/file/givaxifenivegofusafag.pdfIn PDF document text
    • http://mgmkt.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160715d7078e35---91745483445.pdfIn PDF document text
    • http://ok-poland.com/userfiles/file/8255177767.pdfIn PDF document text
    • https://www.quatainvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16091dfeba8dc9---pojozibixetagafitilo.pdfIn PDF document text
    • https://pirkitpadangas.lt/ckfinder/userfiles/files/suzavapirajuravufolati.pdfIn PDF document text
    • https://ixiu-23.com/uploads/files/202108181925509093.pdfIn PDF document text
    • http://www.mostex.sk/files/articles/file/15374774241.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=business+english+worksheets+printable+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_off0000b435.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB435 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cc47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC47 15288 bytes
SHA-256: 51a5dc5db526dfa0c07cf8491616bb4b1de9fb276c041e99e5ac3994a5c0956c
font_02_sfnt_off0000f2a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2A8 11248 bytes
SHA-256: a8db63b4d96567a3cc4077a551b29ae17ea562985185eef6251af0ad599f2b3e

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