Malicious PDF — malware analysis report

Static analysis result for SHA-256 37e993ab6fd69cd3…

MALICIOUS

PDF

107.8 KB Created: 2021-08-20 18:54:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 5abf0c03ceba5c1987fe1066f27ec979 SHA-1: 3aa07704004fa064fd01d2dead4b54f694fb285d SHA-256: 37e993ab6fd69cd3f738e4c019279bfb054ecc8daa74b3550d135687bbbe372f
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous URLs pointing to potentially compromised websites or disposable hosting. The presence of multiple external URIs and link farm heuristics suggests the document is designed to redirect users to malicious sites, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://catamma.ru/uplcv?utm_term=warhammer+40k+codex+9th+edition PDF link annotation
    • http://www.verneteco.com/ckfinder/userfiles/files/53427276048.pdfIn PDF document text
    • http://etpatatietpatata.com/userfiles/files/90620869764.pdfIn PDF document text
    • https://www.hit-education.com/wp-content/plugins/super-forms/uploads/php/files/p6ttjd7g94qk67t4gmlj7o1uoj/safol.pdfIn PDF document text
    • http://www.ellisrasbetonwerke.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160a831968af21---27983249587.pdfIn PDF document text
    • https://grand-forge.ru/wp-content/plugins/super-forms/uploads/php/files/58715648aa06df77c50688866e6eb5be/23842767786.pdfIn PDF document text
    • http://usaoxin.com/userfiles/2021-7/file/93326838720.pdfIn PDF document text
    • http://knoxvillecentralhs1966.com/clients/8/8c/8c0a3a1fea337096d337135aeb812fb1/File/mumonaxidajunu.pdfIn PDF document text
    • http://firmykominkowe.pl/Obrazki/edytor/file/wegewowo.pdfIn PDF document text
    • http://3q1p.com/upload/file/210715194526985192vn16l36jmmsl.pdfIn PDF document text
    • https://mindweave.co.uk/wp-content/plugins/super-forms/uploads/php/files/r677humv7im0mdnne0dvc4bhnm/68979476708.pdfIn PDF document text
    • http://seasonsblinds.com/uploads/ckfinder/userfiles/files/ginikanaruj.pdfIn PDF document text
    • http://agrobud.net/uploaded/file/66130572249.pdfIn PDF document text
    • https://medtek.vn/storage/file/67126494791.pdfIn PDF document text
    • https://goldenparadisestsimons.com/wp-content/plugins/super-forms/uploads/php/files/f279378a49959a349e4743c757404fd2/voxuzelegejimepekenadagud.pdfIn PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/6d5d6d07307c397c248394b1f0ecc040/nugibib.pdfIn PDF document text
    • http://robertoantoniz.com/resources/original/file/35304289025.pdfIn PDF document text
    • https://szekszardportal.hu/userfiles/file/51998290092.pdfIn PDF document text
    • https://hcs1000.org/wp-content/plugins/super-forms/uploads/php/files/9939788787cc8ca7d98a2ceb2067b92f/33745795229.pdfIn PDF document text
    • http://dijladentalcenter-qa.com/userfiles/file/80228736029.pdfIn PDF document text
    • http://lynxitservices.com/ckfinder/userfiles/files/fanezorenivoputib.pdfIn PDF document text
    • http://tajeer.co/userfiles/file/zapomizixutodi.pdfIn PDF document text
    • https://bxthirteen.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/7ef9e28a141c2a8a96ea08b881c4f275/bekevojatoxojo.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_off00014439.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14439 10976 bytes
SHA-256: 4a24946c4e1f07aa4d2df74ec7ac45fcf2b0356b0c094c85b0cb0b02f4aa98b1
font_01_sfnt_off00015d90.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15D90 16888 bytes
SHA-256: 64cc554ab2caa98daa4cc1253e3c335db8c9ccfcb2365d2d59a01a012fa1ee04
font_02_sfnt_off0001894c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1894C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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