Malicious PDF — malware analysis report

Static analysis result for SHA-256 35af8d1c61ec0dba…

MALICIOUS

PDF

90.2 KB Created: 2021-07-03 14:44:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2026-06-05
MD5: 44af93e3b2fa762926d0bb59343ae92c SHA-1: 164b41fbf9b760b55270be0df1c863723e849c8f SHA-256: 35af8d1c61ec0dbab790d2f51a40236e26b0c9e6ed1233a64d505fde8ad92bd0
136 Risk Score

Malware Insights

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

The sample is a PDF document that leverages social engineering tactics, specifically a ClickFix attack, to prompt the user to execute a command. It contains numerous URLs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm or distribution mechanism. While no scripts were directly extracted, the presence of embedded URLs and the ClickFix heuristic strongly indicate an attempt to download and execute a secondary payload, likely for further malicious actions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 6

  • ClickFix social engineering attack high SE_CLICKFIX
    Document instructs the user to press Win+R or paste a command into a terminal — consistent with ClickFix attacks that bypass macro restrictions by tricking users into running malicious commands directly
  • 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://chcial.ru/uplcv?utm_term=how+to+disable+shortcut+keys+in+windows+7 PDF link annotation
    • https://grupo-kayros.com/userfiles/file/beloxeneramakogo.pdfIn PDF document text
    • http://bradleyhillsapartments.com/demo/uploads/contents/file/53669501529.pdfIn PDF document text
    • http://edgecs.net/documents/nepem.pdfIn PDF document text
    • https://www.basur-tedavisi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083f2bed9061---20927592525.pdfIn PDF document text
    • https://action-roofing.com/wp-content/plugins/super-forms/uploads/php/files/1f0399c809180c3e14d9ceea39e09df7/pikojelijugego.pdfIn PDF document text
    • https://clap-bas.com/userfiles/file/53927889865.pdfIn PDF document text
    • http://chinamakina.com/userfiles/file/pefap.pdfIn PDF document text
    • http://victorylimo1.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a435a4c2c5d---vekob.pdfIn PDF document text
    • https://www.medicalart.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1608ac383a9022---92433505625.pdfIn PDF document text
    • https://norservis.com/files/files/nuximapabaferil.pdfIn PDF document text
    • http://atek-ent.com/upload/file/fudugegopidapitokeger.pdfIn PDF document text
    • http://workprohealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c3b76344cb---36376094536.pdfIn PDF document text
    • https://mobistore.co.nz/wp-content/plugins/super-forms/uploads/php/files/c3154ccffa00bb21cde5630febd47970/zunawawibadafabig.pdfIn PDF document text
    • https://planet-for-events.de/userfiles/file/97414142448.pdfIn PDF document text
    • http://www.associatedomains.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c6b8bb0dfa---wawadixisagatu.pdfIn PDF document text
    • https://anitacalderon.com/ckfinder/userfiles/files/88467137181.pdfIn PDF document text
    • http://caacoding.net/wp-content/plugins/formcraft/file-upload/server/content/files/1609903783ed9b---zozifu.pdfIn PDF document text
    • https://dfa-finanz.de/wp-content/plugins/formcraft/file-upload/server/content/files/16093459dc4fe6---37720117720.pdfIn PDF document text
    • https://g3az.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607174dacbb47---sifaxelom.pdfIn PDF document text
    • https://www.bountyvacation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608aa3eae36e0---86773643053.pdfIn PDF document text
    • http://acetuitioncentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607c6dc6e203c---safovagaxinevop.pdfIn PDF document text
    • http://www.centralperdana.com/file/nazezofuvuzowasomifokok.pdfIn PDF document text
    • http://trainternational.in/wp-content/plugins/formcraft/file-upload/server/content/files/160a3cd32035ff---nojininixuwuzujelu.pdfIn PDF document text
    • http://www.naturapreserved.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad303bcb8e4---78563435760.pdfIn PDF document text
    • 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_off0000fae1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAE1 17184 bytes
SHA-256: 926436c6ebb030b63fb0f05ed2d362bb2836ab047f68905ec2e28cbe1589f3c3
font_01_sfnt_off000127ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127CE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013fe5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13FE5 11040 bytes
SHA-256: 3156911f003e461ff80b6d5c7db6190cf6fb78c5d453b462081df492df3e01c6

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