Malicious PDF — malware analysis report

Static analysis result for SHA-256 794a95ba2d3bbd77…

MALICIOUS

PDF

90.7 KB Created: 2021-07-10 08:29:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 25e42b0beb70b6f4bdd97d7a5439a616 SHA-1: 1fb89f2e2f1bac038a880bfb0c241ab2e5296724 SHA-256: 794a95ba2d3bbd77f4761187b641dad15e41b5230099acef41c825d589bee725
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by ClamAV and an ML classifier. It contains numerous external URLs, many pointing to compromised WordPress sites, suggesting it acts as a link farm to distribute malicious content or phish for information. The PDF structure and embedded content indicate it's designed to redirect users to these external sites, likely as part of a phishing campaign or to download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9822

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://inwebjor.ru/uplcv?utm_term=classification+of+anemia+pdf
    • http://www.deadclan.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1606cb48b8d0b3---nenofelofizemagutaxu.pdf
    • https://wills.sg/wp-content/plugins/super-forms/uploads/php/files/6466209502b073548f18fdb72b263c07/romiwil.pdf
    • http://reunionclass.com/clients/7469/File/76698052007.pdf
    • http://www.zulfugar.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608bcb5b6ffff---41324014471.pdf
    • https://fid-data.fr/app/webroot/uploaderfiles/fexisibe.pdf
    • http://sl-light.ru/design/img/upload/file/45420212344.pdf
    • https://assurancemauricie.com/wp-content/plugins/formcraft/file-upload/server/content/files/160912fe8cb292---75533825500.pdf
    • http://www.insurancedirectcanada.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160c1138974f30---73262833939.pdf
    • https://bestcoloringpages.com/userfiles/file/55869673853.pdf
    • https://taxiporec.top/wp-content/plugins/super-forms/uploads/php/files/fkj5qangr3rpj89g86gvpsh9f1/welasozilo.pdf
    • https://dmddsgn.com/wp-content/plugins/super-forms/uploads/php/files/eed0595580f42200a9169e60a59f71ec/rirapuduz.pdf
    • https://www.frankreich-ferien.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160b593da90552---gamusopatisu.pdf
    • https://www.mozartcantat.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160792688b9984---sisosexi.pdf
    • https://whitesal.com/data/images/file/2575_20210629115021.pdf
    • http://www.studiolegalefusimorelli.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608137b5429ed---lomowifivipufogumi.pdf
    • http://yummyschool.com/_UploadFile/Images/file/dupira.pdf
    • https://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/61e668febda18003bf4d28892fa65154/fumid.pdf
    • https://utilitydiscount.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e249174a28---54121470524.pdf
    • https://www.sussexweddingservices.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16071580544b0d---35352838511.pdf
    • http://hanleyresources.com/images/loravifadabotivowifafuruj.pdf
    • https://nicemexico.net/wp-content/plugins/formcraft/file-upload/server/content/files/160bbeccbc267e---kekivowixijuf.pdf
    • https://dmddsgn.com/wp-content/plugins/super-forms/uploads/php/files/45a2246bce6bbf5fe6dbc7283a31259a/jaseduk.pdf
    • http://billsky.ee/files/file/nuguwano.pdf
    • http://metabolit-plus.ru/files/file/dusonokowolodolo.pdf
    • http://www.jindatunnel.com/up_files/file/17392142121.pdf
    • https://www.duffylighting.com/wp-content/plugins/super-forms/uploads/php/files/a9d14c116976fdda9d1a748f6c6b8efc/13879869078.pdf
    • http://discoveryenglish.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607a3a8ea88a7---kabelujufuvadosa.pdf
    • https://accesoriosalmayor.com/images/userfiles/file/zojov.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ff48.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFF48 16792 bytes
font_01_sfnt_off0001175a.bin
01ffd27c116df8ca28c701230c601a1066479c43ba877e104c6ccc6d0f36b02b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1175A 17932 bytes
font_02_sfnt_off000144b3.bin
edfc3030a66e140ad873f79a6288d6303526a5f01ad7c6bb12bf9e6a184fdeba		 pdf-font-stream PDF embedded font (sfnt) at offset 0x144B3 10712 bytes

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