Malicious PDF — malware analysis report

Static analysis result for SHA-256 803b8e4644426ca4…

MALICIOUS

PDF

94.5 KB Created: 2021-06-30 22:35:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: e04f551a5a01e5ee126922effe024170 SHA-1: 3fbf98993bdd51dd16b6498253602bff12ceb62e SHA-256: 803b8e4644426ca4c8b4866a93b6a4e921f416602a710e77b60590591ef94ad5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file was identified as malicious by a ML classifier and ClamAV, detecting it as a phishing trojan. Heuristics indicate the PDF contains a link farm pointing to compromised WordPress upload storage and other disposable hosting, suggesting a phishing or malware distribution lure. No scripts were extracted, and the document body was unreadable, but the presence of numerous external URLs strongly suggests a malicious intent to redirect the user.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9935

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://watfordfairtrade.org/app/webroot/img/files/kawubafenanoroxetemima.pdf In PDF document text
    • https://erinmillssmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/0vgrdjicfroncbtpimr1pitf62/25225349378.pdfIn PDF document text
    • https://hohsingfiber.com/ufiles/files/dilufumug.pdfIn PDF document text
    • http://kazenergy.kz/wp-content/plugins/formcraft/file-upload/server/content/files/160814c0fa0cd8---2153804068.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609de454d093d---39155865939.pdfIn PDF document text
    • https://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/ac37ba2de7b51df1cdf3ddf7cccd52db/34182309400.pdfIn PDF document text
    • http://leadershipcareer.kr/fckeditor/_upload/file/76575626501.pdfIn PDF document text
    • http://rolmech-strzelno.pl/Upload/file/84805863585.pdfIn PDF document text
    • http://szpital-sulecin.pl/images/fckfiles/file/74863442895.pdfIn PDF document text
    • http://qlinairnv.be/userfiles/file/baderibajuzuwusodu.pdfIn PDF document text
    • https://vashadvokat82.ru/wp-content/plugins/super-forms/uploads/php/files/ee0e6b8bd915225343ccfd21df9abc0f/mazikovipomezolinoker.pdfIn PDF document text
    • http://tajeer.co/userfiles/file/vexapuluke.pdfIn PDF document text
    • https://www.ciabrini-immobilier.com/wp-content/plugins/super-forms/uploads/php/files/nn4udu8nroraiuc1jurochvkrd/31603086326.pdfIn PDF document text
    • http://z-i-f.ru/userfiles/file/nuzixiwidaxuzarekiled.pdfIn PDF document text
    • https://www.partyshuttlebus.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607ffd7fda6ae---zawujerupirukusunodugeti.pdfIn PDF document text
    • https://instalacje-elektryczne.net/ckfinder/userfiles/files/72494746426.pdfIn PDF document text
    • http://angelcabrera.com/FCKfiles/file/49017795299.pdfIn PDF document text
    • https://shrmivirtual.org/wp-content/plugins/super-forms/uploads/php/files/4298029af97d3408a60cc2a5497c1c60/sivasopapitip.pdfIn PDF document text
    • https://stcatherine.ac.ug/wp-content/plugins/formcraft/file-upload/server/content/files/1608389667a802---gatoxogo.pdfIn PDF document text
    • http://brighterhealthcare.co.uk/wp-content/plugins/super-forms/uploads/php/files/h576l0pfpgg0hr2mhvibqn7vit/19028618680.pdfIn PDF document text
    • https://stewsites.com/wp-content/plugins/super-forms/uploads/php/files/e74619e29db70ae88659f0a75f4e1bf4/12099776200.pdfIn PDF document text
    • https://www.caesarstravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608327a95a1bb---wubolaloxozi.pdfIn PDF document text
    • http://happyhanool.com/ckupload/files/mopakuluwinexoweremo.pdfIn PDF document text
    • https://www.jemelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608845e908db4---17641034332.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=how+did+the+telegraph+workPDF 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_off0001123f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1123F 10568 bytes
SHA-256: 4f61067fe3a76b5d67dbec6f7d0a77846d45766dfec89cb7985853504a009e23
font_01_sfnt_off00012a45.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A45 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014257.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14257 17028 bytes
SHA-256: 2abfd006d5c2b9e3d63f95724a1e2505d575b02a90c024dbcc4209a5860be487

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