Malicious PDF — malware analysis report

Static analysis result for SHA-256 a3993bee8732dd4c…

MALICIOUS

PDF

102.1 KB Created: 2021-08-12 10:17:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 5f8dcec5aa1eb5fc4c79335ce49d303f SHA-1: 9e9b390344a8df865006b34039a47f61477dd108 SHA-256: a3993bee8732dd4c143e62cfd30133d8bc4710679204ad2aba839708f7986855
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 as malicious, including a high-confidence ML classifier and ClamAV detection. It contains numerous embedded URLs that point to compromised websites and disposable hosting, characteristic of a link farm used to distribute malware or conduct phishing. The document body is heavily obfuscated, preventing a clear understanding of its specific lure, but the overall structure and URL patterns strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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=senor+de+los+cielos+season+5+cast PDF link annotation
    • http://appartenvue.net/appart/upload/images/nesokoxuforetojuko.pdfIn PDF document text
    • http://ne-moloko.ee/wp-content/plugins/super-forms/uploads/php/files/c24a68ec2feb1b8a038239a2c904bd6d/78578998275.pdfIn PDF document text
    • https://consurs.ro/ckfinder/userfiles/files/65683402737.pdfIn PDF document text
    • https://xlux.vn/wp-content/plugins/super-forms/uploads/php/files/nf471ejrqvak39oeghc5cffbej/3790130756.pdfIn PDF document text
    • https://uniqrelation.com/userfiles/file/58075626167.pdfIn PDF document text
    • http://zigzagontwerp.nl/sites/default/files/file/devalojanow.pdfIn PDF document text
    • http://el-system.jp/uploads/2012/files/56459096391.pdfIn PDF document text
    • https://www.mnogotrop.com/ckfinder/userfiles/files/91760311070.pdfIn PDF document text
    • http://riskhedgetech.com/uploaded/file/55983163260f13c1356c38.pdfIn PDF document text
    • https://controlcert.se/wp-content/plugins/formcraft/file-upload/server/content/files/160942eed9d49f---zolufudo.pdfIn PDF document text
    • http://clearlakesd.org/wp-content/plugins/formcraft/file-upload/server/content/files/160e399305458f---baladesedibodekot.pdfIn PDF document text
    • https://belgradenightlife.info/wp-content/plugins/super-forms/uploads/php/files/etbjk8s10pstvfuc7v5rm6d1jr/18844176561.pdfIn PDF document text
    • http://www.benvenutialmare.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d7479165346---25785307898.pdfIn PDF document text
    • http://metaglas.kr/userData/board/file/36381276312.pdfIn PDF document text
    • http://www.guaitoli.eng.br/wp-content/plugins/formcraft/file-upload/server/content/files/16071a6c85d8d5---raperaxokokap.pdfIn PDF document text
    • http://tipsclubcr.com/campannas/file/81715710189.pdfIn PDF document text
    • http://adhdadvisory.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fff6478815---muxofekufumogamixipetali.pdfIn PDF document text
    • http://www.bridalchapel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072ac290b079---setenobadubirosepujofama.pdfIn PDF document text
    • http://ecogestval.com/userfiles/file/nubimu.pdfIn PDF document text
    • http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/jit4trg0jed3996osurbmfsim2/23721863301.pdfIn PDF document text
    • https://topupdana.com/contents//files/fogolid.pdfIn PDF document text
    • https://stewsites.com/wp-content/plugins/super-forms/uploads/php/files/9b7b333733ce11620a27ed1b2728789f/fametekesosuxavejuwog.pdfIn PDF document text
    • https://ecoinkworld.com/wp-content/plugins/super-forms/uploads/php/files/f436a563090f7a11da05954898697b9a/43852747567.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_off000126b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126B9 19420 bytes
SHA-256: 12060bd28b88c297a517737ea21335b227ca0bd37a82501f73a4574f6e46102f
font_01_sfnt_off0001587a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1587A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00017091.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17091 10572 bytes
SHA-256: 77f6f49ade6362ccd60639d003090a8bc7d6e34a0cadde333458d4be200b305f

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