Malicious PDF — malware analysis report

Static analysis result for SHA-256 d2cd490f1456d80b…

MALICIOUS

PDF

90.9 KB Created: 2021-07-13 17:24:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 7ae6fb609f411f7e0ee9d192a009a6c1 SHA-1: 4f5fdb719bac6b5556173290f10f2a73ee89bc74 SHA-256: d2cd490f1456d80be87f4e0f4bd9a662f645cfb7ac648cfdea84ea26bc6b7a87
156 Risk Score

Malware Insights

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

The PDF contains a link farm with numerous URLs, many pointing to compromised WordPress upload directories, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were extracted, the structure and embedded URLs are indicative of a malicious PDF designed to lure users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9765

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://carparts-fixture.com/file/file/49893522324.pdf In PDF document text
    • http://stepsforstarlight.org/clients/c/c6/c668404594a1c08d975ab50c7bec58f6/File/gejudojilosukalam.pdfIn PDF document text
    • http://aite-materials.com/upfiles/file/minewozizajogubek.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/16077de6dcd003---xubakopobudiguz.pdfIn PDF document text
    • https://www.mnspineandsport.com/wp-content/plugins/super-forms/uploads/php/files/1fef56fdd57a42fa1025bb15ce363072/jomawefobil.pdfIn PDF document text
    • http://alarmy-kamery24.pl/userfiles/file/fumiwozigus.pdfIn PDF document text
    • https://www.simplythebestevents.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160b9ccbb0c4fd---lopogusutebawivomejiw.pdfIn PDF document text
    • http://bright-inter.com/file_media/file_image/file/4574207921.pdfIn PDF document text
    • http://yatros.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16073c3401c18c---60742097169.pdfIn PDF document text
    • http://www.luminicaambiental.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b6d2c469d9a---87402716310.pdfIn PDF document text
    • http://www.ebsjosepirosamaria.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d8affe24ba---94784578718.pdfIn PDF document text
    • http://steakclubhn.com/campannas/file/96958502281.pdfIn PDF document text
    • https://yziact.fr/wp-content/plugins/super-forms/uploads/php/files/q9gamk7ptes5ss6j9u38i79hus/lutesurudebukegewabunop.pdfIn PDF document text
    • http://lapenya.cat/imgjovesnaves/file/kunoxumoxiduvobotuvo.pdfIn PDF document text
    • http://www.novosib-sport.ru/ckfinder/userfiles/files/jogesibujamakul.pdfIn PDF document text
    • https://infiniteprospects.com/FCKeditor/file/padagiveduxopadogedux.pdfIn PDF document text
    • http://penzionklara.cz/userfiles/file/5812738612.pdfIn PDF document text
    • https://envomask.com/wp-content/plugins/super-forms/uploads/php/files/c68b878209d2c78d0d91cfefc8fbca03/3184038588.pdfIn PDF document text
    • http://bizwd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7f3f0b78e9---90957776591.pdfIn PDF document text
    • http://associacaoguainumbi.org.br/wp/wp-content/plugins/formcraft/file-upload/server/content/files/16098881781cc8---tiwozafef.pdfIn PDF document text
    • http://partnerplus30.ru/images/fornews/files/22605943999.pdfIn PDF document text
    • https://sportli.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1606f3d6904f4e---fozutamusaduxewa.pdfIn PDF document text
    • http://seventyfirstclassof69.com/clients/60772/File/diloruv.pdfIn PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/fqr9sm92og7g1a8hu4i808l4q3/dawudigebowibobagezo.pdfIn PDF document text
    • http://kennyre.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bdcdd12a2fd---wanuzo.pdfIn PDF document text
    • http://bortran.com/upload/image/file/20210523025624.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=gonna+get+low+low+lowPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f66a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF66A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010e7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E7C 18836 bytes
SHA-256: e074912fd65c6bed9a56d6f4f3b8e6a1b28db478b032278eabd3d88ff2a51014
font_02_sfnt_off00013f2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13F2F 1856 bytes
SHA-256: 184a936bd1ce5dff700adc4e6a12c67a52a21ba3f6bd4f31defed58e18ed8b92
font_03_sfnt_off000147d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x147D8 10048 bytes
SHA-256: 1fb8ab065790b418d7abed0a8e53aa0e423370438099abe6605f21aa560407d1