Malicious PDF — malware analysis report

Static analysis result for SHA-256 529c237371ca56b8…

MALICIOUS

PDF

100.8 KB Created: 2021-07-02 12:35:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 1643fac5229d4bdd96d87c11de268552 SHA-1: cc6ab818607866a25ae046048014459c1c96ebb6 SHA-256: 529c237371ca56b8e732bd9e7fb38bb2cc2f2e1e726304ad54df6e1e55769d32
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The document functions as a link farm, containing numerous URLs that point to compromised WordPress upload directories and other disposable hosting. These links likely lead to phishing pages or further malware downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9923

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://philabc.ru/uplcv?utm_term=the+tragedy+of+white+injustice PDF link annotation
    • http://www.hj-bouwt.be/wp-content/plugins/formcraft/file-upload/server/content/files/16094df8415c48---70826821657.pdfIn PDF document text
    • https://www.fmworks.com.tr/wp-content/plugins/super-forms/uploads/php/files/o2je6qvlevgjc70vm66n3vic3s/17430675712.pdfIn PDF document text
    • http://ednak.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4b8a410f1a---lubuvamarej.pdfIn PDF document text
    • http://cokhihoaiduc.com/uploads/files/pumebeguwiz.pdfIn PDF document text
    • http://www.unidacardoso.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160bb88bf4a2aa---dutafezutaludadimejogew.pdfIn PDF document text
    • https://kp-bs.ru/upload/files/navotolaxa.pdfIn PDF document text
    • https://cuisinescartier.ca/upload/editor/file/ziguso.pdfIn PDF document text
    • https://pikewallis.no/wp-content/plugins/formcraft/file-upload/server/content/files/1608364af996bd---verowevokixowekarejo.pdfIn PDF document text
    • https://www.adelaarenergy.com/wp-content/plugins/super-forms/uploads/php/files/22fn0f8bk6g65ag60r3vo4jv8h/57666990186.pdfIn PDF document text
    • http://studiolegalezullo.eu/userfiles/files/41642276215.pdfIn PDF document text
    • https://soudurelauziere.com/upload/editor/file/79359241809.pdfIn PDF document text
    • http://traiteur-ribot.fr/userfiles/file/66010742710.pdfIn PDF document text
    • http://jeugdopdewetenschapsagenda.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16087b425d55be---24344519209.pdfIn PDF document text
    • http://nuraski.pl/wsg/userfiles/70225163663.pdfIn PDF document text
    • https://mamproducciones.es/wp-content/plugins/formcraft/file-upload/server/content/files/1607a43239868b---17497442240.pdfIn PDF document text
    • http://ajtoablakcentrum.com/_user/file/teputaxame.pdfIn PDF document text
    • http://victorylimo1.com/wp-content/plugins/formcraft/file-upload/server/content/files/160849cdf6e50e---wenavamuverigapigaga.pdfIn PDF document text
    • https://dallaslandscapedesign.com/media/files/13322618836.pdfIn PDF document text
    • http://www.iamgoingto1996.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087a4f5a7455---88379031691.pdfIn PDF document text
    • https://www.xcelsus.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609dda40d6054---zegedajelanekogeputuni.pdfIn PDF document text
    • http://alphanaturehk.com/userfiles/file/48436751969.pdfIn PDF document text
    • http://mountmedpharmacy.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1607c727ce9639---zanagumugikilunir.pdfIn PDF document text
    • http://icmasistemas.com/userfiles/files/vazisuwilorosiwebinowufo.pdfIn PDF document text
    • http://automsystem.com/UploadFile/file/20210508180940847.pdfIn PDF document text
    • http://www.skupp.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1607f57bdddf11---51076030007.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_off000127b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127B4 16560 bytes
SHA-256: 78b567315f2a61ed7a4ba0f04e1c86e6c672909aa4ebe9243ba51f6cfdc0453f
font_01_sfnt_off00015297.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15297 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00016aae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16AAE 11104 bytes
SHA-256: 88e4bbc899a42ef05044c98c4e8760e7c1a4c04beb42e3b6224bbe9a27e4602d