Malicious PDF — malware analysis report

Static analysis result for SHA-256 2f418c3998680490…

MALICIOUS

PDF

75.6 KB Created: 2021-09-26 21:08:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 596e2014d3738c53ef8a3d347ba84ac9 SHA-1: a84cc490da81ee2646b9e61ad4ef98b2c5895214 SHA-256: 2f418c3998680490a3ced86724da7c4368028aed93a9cf6d60344216bc214068
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many pointing to compromised CMS upload directories, suggesting a link farm designed to redirect users to malicious sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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=what+is+cache+partition+in+android PDF link annotation
    • http://flywings.sk/UserFiles/file/jovagapezi.pdfIn PDF document text
    • http://pololanna.com/user_img/files/40580027929.pdfIn PDF document text
    • http://sungwoneng.com/upfile_editor/2021/files/62453652852.pdfIn PDF document text
    • http://pebyte.com/wp-content/plugins/super-forms/uploads/php/files/3i6dq3p59224bdclpesseabm14/19877953602.pdfIn PDF document text
    • https://beaufortbond.com/wp-content/plugins/super-forms/uploads/php/files/8a400f68f20da9cf7b3ed7105be251c3/22456780046.pdfIn PDF document text
    • http://mstreatmentadvances.com/userfiles/files/kaketili.pdfIn PDF document text
    • http://profil-metall.de/content/uploads/file/zezowewoxizidixiwulabifi.pdfIn PDF document text
    • http://dorp.pl/userfiles/files/fotipojafor.pdfIn PDF document text
    • http://lizhechem.com/upload/files/29989953333.pdfIn PDF document text
    • http://candientuvibra.com/images/file/40995464185.pdfIn PDF document text
    • http://pinxedien.net/upload/files/61529342943.pdfIn PDF document text
    • http://szhlfz.net/upload/9044029063.pdfIn PDF document text
    • http://marcelponjee.nl/ponjeefiles/file/rewadunobemokanokuko.pdfIn PDF document text
    • http://matrixpaint.com/ckfinder/userfiles/files/fanug.pdfIn PDF document text
    • http://nuestratierrapremios.com/campannas/file/mirorizozonerivajifulus.pdfIn PDF document text
    • http://cmrivestimenti.com/userfiles/files/22146367362.pdfIn PDF document text
    • http://bkm-market.net/userfiles/file/2962955131.pdfIn PDF document text
    • http://thefutureofgolf.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1614120e3615af---54928779745.pdfIn PDF document text
    • https://ebus.myskoolapp.com/FCKeditor/FCKimgUpload/file/razidisuribudefagunotim.pdfIn PDF document text
    • http://slr-eyewear.com/slr/userfiles/20210913174205.pdfIn PDF document text
    • http://manilag.com/FileData/ckfinder/files/20210927_44C21B628B9D1AF1.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_off0000c0ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC0CA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d8e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8E1 10556 bytes
SHA-256: cd0d87446edf5ca69090f83a319591cf88e608662c6f15c45c024ea946698295
font_02_sfnt_off0000f0ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0ED 18404 bytes
SHA-256: 7382103a6888d8b1828464a816447c619e8402cc99e6bb1735b26252ee3bae5a