Malicious PDF — malware analysis report

Static analysis result for SHA-256 3f7dd9a3fe8f7c89…

MALICIOUS

PDF

77.2 KB Created: 2021-09-04 14:52:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 51a707afd4e579abbcd3105d3d1cc6d9 SHA-1: cf997cc4bcc3460d0e2ef3e3de0871b7e5a14838 SHA-256: 3f7dd9a3fe8f7c8985f219a0716b8ab5a76ab09e172959577faa167138ce54ed
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The file contains numerous links to external websites, many hosted on compromised CMS platforms or disposable domains, suggesting a phishing or scam campaign. The presence of PDF-specific heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' further supports this, pointing to a tactic of using link farms to redirect users. No scripts were extracted, but the overall structure and URL distribution strongly suggest a phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://queure.ru/uplcv?utm_term=rsmssb+patwari+old+paper+pdf PDF link annotation
    • https://carpanea.it/wp-content/plugins/super-forms/uploads/php/files/032a942730a17c0c89cb98f37e3042c2/22627673717.pdfIn PDF document text
    • http://builderall.info/userfiles/file/nelugotumavigufinon.pdfIn PDF document text
    • https://www.kiteschule-kiel.de/wp-content/plugins/formcraft/file-upload/server/content/files/16104d107b651b---simiroxujemapeguzuze.pdfIn PDF document text
    • http://www.finanzanlagen-honorarberatung.de/wp-content/plugins/formcraft/file-upload/server/content/files/161176992d6530---62502239543.pdfIn PDF document text
    • http://www.cheapmotorcycleinsurancepa.com/wp-content/plugins/super-forms/uploads/php/files/04hdhrjct0mv16ptptgrj474r1/771378733.pdfIn PDF document text
    • http://rungruangsteel.com/public/upload/userfiles/files/davikanurajetadawepi.pdfIn PDF document text
    • http://www.marcelasemper.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608641f66d986---66163739561.pdfIn PDF document text
    • http://p-itos.net/admin/userfile/image/file/7918896510.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/6nfhjtt7pv5o6cnk79jrcpi806/lurativopojuvigetuvixu.pdfIn PDF document text
    • https://www.grdr.org/paidel/ckfinder/userfiles/files/jipejijasolekux.pdfIn PDF document text
    • https://northwestconvention.cz/data/files/zasametomudimomemot.pdfIn PDF document text
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/49ja3jd9ni3l6baehru3j92i42/dagoxizuzusikanu.pdfIn PDF document text
    • http://cobe-ing.it/userfiles/files/buxufatirine.pdfIn PDF document text
    • https://orig-shop-gsm.ro/ckfinder/userfiles/files/43075122803.pdfIn PDF document text
    • http://kingspec.su/wp-content/plugins/super-forms/uploads/php/files/v7hu2681tgvg7hc1kjbu8284od/sofotakokikig.pdfIn PDF document text
    • http://championshipsportsrings.com/clients/23492/File/88171696029.pdfIn PDF document text
    • http://toanlinh.vn/upload/files/katotivazelaka.pdfIn PDF document text
    • http://dxqzx.com/ckfinder/userfiles/files/20210622_143134.pdfIn PDF document text
    • https://livres-d-art.com/ckfinder/userfiles/files/teguraz.pdfIn PDF document text
    • http://kashima.cc/userfiles/file/gemuduziwux.pdfIn PDF document text
    • http://daltan.hu/userfiles/file/34510572563.pdfIn PDF document text
    • http://www.petersmetalstitching.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16074111cd4cff---15984761909.pdfIn PDF document text
    • https://sakitonus.ru/wp-content/plugins/super-forms/uploads/php/files/9ac4bf238a92e435e3c1a157d7d170e6/jadudozoxuf.pdfIn PDF document text
    • https://ceilford.org/wp-content/plugins/super-forms/uploads/php/files/9e295f139e4cd9308464a12c35a21fc9/3475191970.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_off0000c940.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC940 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e152.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE152 17376 bytes
SHA-256: 9fcbe581aa8d7765ddab2cd0ff4750fc2dfbc33f4505958c20ebb548d18a1920
font_02_sfnt_off00010e63.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E63 10824 bytes
SHA-256: e8396aca7b3fd4c8a929fd6f97a19ff4c1cd556a084eff67bea27ac24a41361c

Open this report in the interactive analyzer, or submit your own file for analysis.