Malicious PDF — malware analysis report

Static analysis result for SHA-256 469697c177234e46…

MALICIOUS

PDF

117.3 KB Created: 2021-09-08 08:05:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 0b903965d1c5482b29b9780ffd719f6b SHA-1: 6c4f2ba70fd40e9a804d24c3cbd5490269c31f18 SHA-256: 469697c177234e46beec21214a56ccf5d9a0a6c624bf9eebc640b4930a0c34f2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous URLs pointing to compromised WordPress uploads and other potentially malicious sites, suggesting a phishing or malware distribution scheme. The PDF structure itself is also noted as a link farm on disposable hosting, further supporting this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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=guillain+barre+pdf+peru PDF link annotation
    • https://tongdaidoanhnghiep.com/app/webroot/upload/files/negelejitedos.pdfIn PDF document text
    • http://moscowballet.ru/userfiles/file/24798672019.pdfIn PDF document text
    • http://adidravidar.com/ckfinder/userfiles/files/55111792849.pdfIn PDF document text
    • http://billedbutikken.dk/articlefiles/file/selemeviduzedalen.pdfIn PDF document text
    • https://mujeresenmovimientoplus.com/userfiles/file/71696853375.pdfIn PDF document text
    • https://mamproducciones.es/wp-content/plugins/formcraft/file-upload/server/content/files/16075ab8b6a489---berokigixelan.pdfIn PDF document text
    • http://stacjaregeneracja.pl/userfiles/file/napukuwupezitop.pdfIn PDF document text
    • http://call.ae/wp-content/plugins/formcraft/file-upload/server/content/files/160746e1f61943---tekalevugozisuduwabobit.pdfIn PDF document text
    • http://iamsoldierfit.com/wp-content/plugins/formcraft/file-upload/server/content/files/160908d5b4f170---81789135636.pdfIn PDF document text
    • https://alismobile.co.uk/wp-content/plugins/super-forms/uploads/php/files/5d07880b27703a324267a7f42d560d59/80667747189.pdfIn PDF document text
    • http://www.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/16093b7ac2cfa1---litawejevulapuxosegizi.pdfIn PDF document text
    • http://www.stemcellhairclinic.com/files/files/83623586760.pdfIn PDF document text
    • http://aircond.md/upload_fck/file/69183001818.pdfIn PDF document text
    • http://zzzwchem.com/upload/files/52600727723.pdfIn PDF document text
    • https://maturana.cl/upload/file/pudamurabunozok.pdfIn PDF document text
    • http://www.elitagida.com.tr/wp-content/plugins/super-forms/uploads/php/files/dea5hsaa97o6tn9f22m14v3hi6/81763329428.pdfIn PDF document text
    • http://penzion-u-zamku.cz/files/file/84353981360.pdfIn PDF document text
    • https://namastehealth.in/wp-content/plugins/super-forms/uploads/php/files/i1c7tcqnme70l10sk75cbbh3cl/9627304101.pdfIn PDF document text
    • http://lifestyleufa.ru/wp-content/plugins/super-forms/uploads/php/files/6902e7a7b81bbf5b7453dfd5107d12c7/70151859133.pdfIn PDF document text
    • http://galettedesrois.hu/userfiles/file/96957763527.pdfIn PDF document text
    • https://yarsan.ru/wp-content/plugins/super-forms/uploads/php/files/534b0a7e964fc1edcf00283fbcf8eb42/8885523957.pdfIn PDF document text
    • http://jordanfamilyreunions.com/clients/5/51/51534e3e38036466a76ca8a024fd4923/File/nedopugizinobafepid.pdfIn PDF document text
    • https://donnasalon.ru/wp-content/plugins/super-forms/uploads/php/files/71908967ce47c8170751db0fafecd0a5/fipufi.pdfIn PDF document text
    • http://kaies.cn/upfiles/file/47504913792.pdfIn PDF document text
    • https://mediaget.com/userfiles/files/13123750408.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_off00016427.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16427 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00017c3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17C3E 10384 bytes
SHA-256: 76caa576dad882e969c129b5178987eb51e8e210843e717c082f3768bf3271a8
font_02_sfnt_off00019384.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19384 19656 bytes
SHA-256: e4eb55f8c4cbb15471c22d3c8273ba7e8a0865d203a01eda181af5aa3f025564

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