Malicious PDF — malware analysis report

Static analysis result for SHA-256 04c9c6826a6dc5b9…

MALICIOUS

PDF

99.8 KB Created: 2021-08-01 02:21:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 6b5e7a5c17f0e2e44707f0272f5a79fc SHA-1: 95a74e097d9e50b08f648b1ea25455bcabf9c30d SHA-256: 04c9c6826a6dc5b953dbc3039058ebe176704fbd0bd3b46f9d900afdf66f4331
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

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 that point to compromised WordPress installations. These links are likely used for SEO poisoning or to redirect users to phishing or malware distribution sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://infrive.ru/uplcv?utm_term=tipos+de+investigacion+cualitativa+cuantitativa+y+mixta PDF link annotation
    • https://www.adelaarenergy.com/wp-content/plugins/super-forms/uploads/php/files/f5pcudnpf9m6r9in7e1nq32c3s/laxisusesa.pdfIn PDF document text
    • https://cspdental.com/wp-content/plugins/super-forms/uploads/php/files/355601a7468f83c6137f95288afa1c53/nibigosujivesixamusofo.pdfIn PDF document text
    • http://www.lentilles-progressives.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160986bd62947f---vimubalivivexutulav.pdfIn PDF document text
    • http://coytex.net//ckfinder/userfiles/files/2297416663.pdfIn PDF document text
    • https://khanikango.in/file/94519121046.pdfIn PDF document text
    • https://adsbudget.net/userfiles/file/numevado.pdfIn PDF document text
    • http://oneself.pro/wp-content/plugins/formcraft/file-upload/server/content/files/160c3692075410---fuziwupamofurubiw.pdfIn PDF document text
    • https://ivfnna.gr/wp-content/plugins/super-forms/uploads/php/files/a0d538ec9241d51216a58276b7e0de8e/85589324149.pdfIn PDF document text
    • http://uci.ir/userfiles/file/momabijokezomunalewavuk.pdfIn PDF document text
    • http://galeriejacqueselbaz.com/userfiles/file/78673580715.pdfIn PDF document text
    • http://belgium-ex.com/images/blog//file/88172484703.pdfIn PDF document text
    • http://xn--80aafbanafwvcftiqfecrg2a.xn--p1ai/pict/file/gumizikon.pdfIn PDF document text
    • http://zawayakw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160772dc64d2bd---7674383443.pdfIn PDF document text
    • http://fine-cottage.ru/userfiles/file/31429392552.pdfIn PDF document text
    • http://aristosaigonhotel.com/uploads/files/96067515070.pdfIn PDF document text
    • https://erinmillssmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/21r32vgfgdei80op06p9dgtlj3/soruwekatobowarir.pdfIn PDF document text
    • http://brilspa.ro/userfiles/file///momolugudokolulibeda.pdfIn PDF document text
    • https://annjulieskarpmo.com/userfiles/file/nopupaxesok.pdfIn PDF document text
    • http://technology-mp.it/userfiles/files/19177844325.pdfIn PDF document text
    • https://www.guestquesttravelmedia.com/wp-content/plugins/super-forms/uploads/php/files/tan6fk0krh7evr2j343v8t5od1/vudosuxovav.pdfIn PDF document text
    • https://ahi.com.ua/wp-content/plugins/super-forms/uploads/php/files/5f27c1476d233276c3a94f3a5246f71b/kipavewenusemufadoperibov.pdfIn PDF document text
    • http://www.garriagricola.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b074db15f1---48602337297.pdfIn PDF document text
    • https://rescue.bg/wp-content/plugins/formcraft/file-upload/server/content/files/1607bf2080b412---wobigomekoviwuwatejumajar.pdfIn PDF document text
    • http://asesoriagarpe.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7d6131ce3a---lanogexuluso.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_off00011cbf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CBF 11104 bytes
SHA-256: 94b21929c03c25ca78cc01053b99866692e10a581b192946d78b08148dc75a91
font_01_sfnt_off00013683.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13683 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014e95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14E95 18720 bytes
SHA-256: 0fa9a53c7be57e112d747722a42063e2e6f8564dd1f82560db377d75c4a9e842

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