Malicious PDF — malware analysis report

Static analysis result for SHA-256 960b52d89e2225f8…

MALICIOUS

PDF

82.1 KB Created: 2021-09-06 22:08:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 3f91f6f5193fa6aa97c564fea99eaa86 SHA-1: a143aabad5f51e1ad822ea035e263e311099b0bf SHA-256: 960b52d89e2225f8b94f0530f7700da03db5583b0a7c23bd5ea9844e01952f43
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by a machine learning classifier and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, containing numerous embedded URLs pointing to potentially compromised websites and disposable hosting. The primary purpose appears to be directing users to external malicious content, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://inwebjor.ru/uplcv?utm_term=breadman+pro+tr875+user+manual PDF link annotation
    • http://edwardfmcgintypa.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/wolixewikuzavidunox.pdfIn PDF document text
    • https://dmvassociates.com/wp-content/plugins/super-forms/uploads/php/files/505cde862a4902d6ef7c25b8754ec976/jufapolewirofidivexivukup.pdfIn PDF document text
    • https://yumasri.com/assets/ckfinder/userfiles/files/nelozevixibevigexe.pdfIn PDF document text
    • http://valsadindustries.com/userfiles/file/jozojex.pdfIn PDF document text
    • https://argekaucuk.com/nbg/upload/files/xudazivili.pdfIn PDF document text
    • https://bechtoldpaving.com/wp-content/plugins/super-forms/uploads/php/files/67b105a5418081972e5327ee800a657d/xedopazujuvu.pdfIn PDF document text
    • https://coimbatorepressclub.com/FCKeditor/userfiles/file/6261527411.pdfIn PDF document text
    • https://www.adom.biz.pl/ckfinder/userfiles/files/jowus.pdfIn PDF document text
    • http://serendipityorlando.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098d69a456f7---43679894755.pdfIn PDF document text
    • http://affordableadobe.com/ckfinder/userfiles/files/32129362960.pdfIn PDF document text
    • http://westleyden72reunion.com/clients/4/46/469dc9162705cbff2d1fbe132f144f37/File/11592313945.pdfIn PDF document text
    • http://humanitool.ru/userfiles/file/ragaxidiwunozarum.pdfIn PDF document text
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/verezeluvejupetelizomew.pdfIn PDF document text
    • http://scarpatti.com/files/62288193386.pdfIn PDF document text
    • http://casier-a-bouteilles.com/file/jokin.pdfIn PDF document text
    • http://angel-conference.org/upload_fck/file/2021-8-9/20210809230715959686.pdfIn PDF document text
    • https://arizonapoolcontractor.com/wp-content/plugins/formcraft/file-upload/server/content/files/16121b455a9c25---bitemokonafumozefivozej.pdfIn PDF document text
    • https://liniagdanskzydowo.pl/files/kolikivigobojirobolu.pdfIn PDF document text
    • http://www.marcado.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16126af97da5de---27042819335.pdfIn PDF document text
    • http://appartementslisa.it/an3_Uploads/file/rixerexiwibikolavuro.pdfIn PDF document text
    • https://fonixkoncert.hu/upload/file/ferifujutifulomeraperob.pdfIn PDF document text
    • https://www.totspotdaynursery.co.uk/ckfinder/userfiles/files/gagudilodivum.pdfIn PDF document text
    • https://hazeloyun.com/calisma2/files/uploads/46075517128.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_off0000dabd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDABD 17848 bytes
SHA-256: da1e0c209d6e5bce674762d75b7a7b7d5d2bd38d74294d73fcad63e7d822413c
font_01_sfnt_off000108d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108D2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000120e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120E9 11008 bytes
SHA-256: f878ef7696b69c79f50713be1cac44b11e10b0eace4ee7ce3d77b9a32d310ff3

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