Malicious PDF — malware analysis report

Static analysis result for SHA-256 c694e89fc5b86310…

MALICIOUS

PDF

81.5 KB Created: 2021-09-02 20:24:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 1c3b11d0445f47d8dcb3395c95001466 SHA-1: 6f107d75e8e48d482cbdc75c8e7bde4745bb2def SHA-256: c694e89fc5b86310e1722367167734f5e42d0a194afc505b6d103b045e5d4229
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous links, many pointing to compromised CMS upload directories or disposable hosting, suggesting a link farm designed to redirect users. While no scripts were explicitly extracted, the PDF structure and link farm behavior are consistent with phishing or malware distribution lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://galsabino.it/userfiles/files/lakijotumofobimuval.pdf In PDF document text
    • https://mytutr.com/wp-content/plugins/super-forms/uploads/php/files/814cedbdd702ea5269c36f4df8274d1b/fopilisaxivujemidebuboj.pdfIn PDF document text
    • http://www.brennholz-heinlein.de/wp-content/plugins/formcraft/file-upload/server/content/files/1610d12aa92c07---mujop.pdfIn PDF document text
    • http://www.iuoelocal870.com/kaizen/ckfinder/userfiles/files/wewifogepojegeku.pdfIn PDF document text
    • https://brylka-kfz.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608687cfc2beb---zakorikomamid.pdfIn PDF document text
    • http://pvsystexperts.com/wp-content/plugins/super-forms/uploads/php/files/ul38j6jd7t4mr8phppsvhe4fh3/33488775458.pdfIn PDF document text
    • https://duhocblueocean.vn/ckfinder/userfiles/files/timoxeluvug.pdfIn PDF document text
    • https://mamproducciones.es/wp-content/plugins/formcraft/file-upload/server/content/files/160a11c786a30f---kusezusejununosurusevi.pdfIn PDF document text
    • http://www.appsolutely.sg/wp-content/plugins/formcraft/file-upload/server/content/files/16114cfd88b0b1---pusotejokorilajesoton.pdfIn PDF document text
    • https://marciasmithconsulting.com/wp-content/plugins/super-forms/uploads/php/files/4070f54d3e6de42b7791f6143ea5726f/wigatekizuvofupevuvoleve.pdfIn PDF document text
    • https://angkalaris.com/contents//files/fuvipakalekaruvivekovuvo.pdfIn PDF document text
    • https://amatnieks.com/pictures/image/3900570273.pdfIn PDF document text
    • http://euredit-editions.com/userfiles/file/51349780327.pdfIn PDF document text
    • https://mandalaconfeccao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160720e9980462---buvugofijuwab.pdfIn PDF document text
    • https://gulertrafik.com/wp-content/plugins/super-forms/uploads/php/files/54ft5b6v310r6196c1kppsj4kh/tejojijukeninazasu.pdfIn PDF document text
    • https://avigailpekelman.com/sites/default/files/file/32662348882.pdfIn PDF document text
    • http://shipagents.nl/uploadfiles/file/42376294084.pdfIn PDF document text
    • http://kim-clark.ru/files/file/19740889111.pdfIn PDF document text
    • https://www.phoenixdentalacademy.co.uk/wp-content/plugins/super-forms/uploads/php/files/a4ae3de02a23d98d7ed83b90bb8d853f/26402396079.pdfIn PDF document text
    • http://isagenixmakessense.com/ckfinder/userfiles/files/85734726386.pdfIn PDF document text
    • https://247christianity.org/fckeditor/userfiles/file/vuvomisogokuluvizena1621631020.pdfIn PDF document text
    • https://tolgyesvolgy.hu/userfiles/file/62321411156.pdfIn PDF document text
    • http://www.acefence.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090d6b71675b---pulamon.pdfIn PDF document text
    • http://szerecsengyogyszertar.hu/editor_up/74778035400.pdfIn PDF document text
    • https://alignerco.com/wp-content/plugins/super-forms/uploads/php/files/7c8b6ce9014d213a4952ca0b83b7c6d6/gowofutuneraxelavi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=steal+like+an+artist+indonesia+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_off0000db91.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB91 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f3a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3A3 17320 bytes
SHA-256: 3b03138388d2f0df5657a75c88d33c5d1c443f41cfafbe458738fbae4cc524dd
font_02_sfnt_off00011ff9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FF9 10660 bytes
SHA-256: 8244cd98441f4ee93aa54ef833f293c80f63db14d52576ff4ae3b00188568801

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