Malicious PDF — malware analysis report

Static analysis result for SHA-256 21c1ef937aa8d261…

MALICIOUS

PDF

71.9 KB Created: 2021-09-01 05:25:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: b3c4987f924abb66e4d965493878e87c SHA-1: f9f6232c70cede9fa5bdf2d3407500b7f180e08f SHA-256: 21c1ef937aa8d2615d5635f861e1167d5a1bbe987529807654713ebc47ae6f2b
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. It functions as a link farm, containing numerous URLs pointing to compromised WordPress sites and other disposable hosting. These links likely lead to phishing pages or further malware downloads, indicating a malicious intent to deceive users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://nomylo.ru/uplcv?utm_term=number+one+nails+near+me PDF link annotation
    • https://southernlightingsource.com/wp-content/plugins/super-forms/uploads/php/files/ba073cbe9c9c2bfa95b7789569c4da5d/vukamipifakirir.pdfIn PDF document text
    • https://afanasyev-design.ru/wp-content/plugins/super-forms/uploads/php/files/413a6b94145871aa973b0947465f5035/30713548373.pdfIn PDF document text
    • https://revapackers.com/wp-content/plugins/super-forms/uploads/php/files/i8gtl3drtlg2b71lcnh247mjcj/deneroxoxexagezavo.pdfIn PDF document text
    • http://hondatayho.top/img-ngocbao/files/96939018345.pdfIn PDF document text
    • https://path.mn/userfiles/files/didujivebibi.pdfIn PDF document text
    • http://serdceprirody.ru/userfiles/file/sokopudugurinigogeba.pdfIn PDF document text
    • https://tirthmobile.com/wp-content/plugins/super-forms/uploads/php/files/j4qen621dq63sqg73qg6j31efo/70870596960.pdfIn PDF document text
    • http://willtorock.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cb8350d0384---sodameludewasikubojijowe.pdfIn PDF document text
    • http://logiccpacma.com/ckfinder/userfiles/files/lanelepirupixazonibe.pdfIn PDF document text
    • http://thongthien.vn/upload/files/27237603173.pdfIn PDF document text
    • http://slovbau.sk/test/userfiles/file/34260362762.pdfIn PDF document text
    • http://ascensionchina.com/userfiles/file/xudebukokixugufagoviz.pdfIn PDF document text
    • http://www.stallionreadymix.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1609be124dc5a6---tewukapa.pdfIn PDF document text
    • http://elturo.ru/img/upload/files/wupanetajedid.pdfIn PDF document text
    • https://www.lipfish.no/wp-content/plugins/formcraft/file-upload/server/content/files/1606c7e3a388c3---mewem.pdfIn PDF document text
    • https://alyosserspneed.com/userfiles/files/dirububinobitudixefoledo.pdfIn PDF document text
    • https://democv.associasuite.com/imagenes/contenidos/files/41396459773.pdfIn PDF document text
    • https://www.drserapkagan.com/wp-content/plugins/super-forms/uploads/php/files/unlnid1m45jkrd9570qdv78j46/nozolisopozugujop.pdfIn PDF document text
    • https://avonsteel.com/UserFiles/file/99404396208.pdfIn PDF document text
    • https://welltowork.org/wp-content/plugins/super-forms/uploads/php/files/f4e76f63f0a7a58347fa9d1883168492/32046272787.pdfIn PDF document text
    • http://allseasonsart.com/uploads/fck_uploads/file/sadofigejobububija.pdfIn PDF document text
    • http://the100voicesofgospel.de/fichiers/newsletter/file/zaxudig.pdfIn PDF document text
    • https://www.hdontheroadnapoli.it/wp-content/plugins/formcraft/file-upload/server/content/files/1608266e1c59c4---zinibexesisubovazoka.pdfIn PDF document text
    • http://www.nandomoraes.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160d2f2f080cdf---pagutamov.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_off0000bc6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBC6E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d485.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD485 10388 bytes
SHA-256: e00174cd803fd5c6fd412aa78835981bf517e34ddd8da05f4b91b67aa79e21b4
font_02_sfnt_off0000ebee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBEE 14844 bytes
SHA-256: b26a5bf03e777a41efb15db20e5b23adb6551be408dad379f424af64bf2932b5

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