Malicious PDF — malware analysis report

Static analysis result for SHA-256 fa026a86e6dce51d…

MALICIOUS

PDF

80.1 KB Created: 2021-09-08 08:27:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: ab7426050dd948603285683827cd9ec6 SHA-1: 49fccf47e25e4bb61a0580125a0bba48a31926f3 SHA-256: fa026a86e6dce51d15a30438e53b1371db757be0b992e4751510f0d4db61113c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a phishing or trojan distribution attempt. It contains numerous embedded URLs, many pointing to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The document body is heavily obfuscated and unreadable, providing no further context on the specific lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://synerhu.ru/uplcv?utm_term=unitech+as10-u+manual PDF link annotation
    • https://alley.52886.tw/uploads/files/34184712575.pdfIn PDF document text
    • https://nailseasupportgroup.com/wp-content/plugins/super-forms/uploads/php/files/2de6d6547dc38282868a0f3e4331df6c/juzukorupajo.pdfIn PDF document text
    • http://geology.ie/wp-content/plugins/formcraft/file-upload/server/content/files/1611f87f59c7ea---latavigiraxajezukidemasa.pdfIn PDF document text
    • http://entryexpress.online/chapter_images/files/rexaradibebaboj.pdfIn PDF document text
    • http://audiomaster.se/wp-content/plugins/formcraft/file-upload/server/content/files/1609053d3c4e8b---18378263838.pdfIn PDF document text
    • https://happycolaborativo.com/uploads/files/57307989419.pdfIn PDF document text
    • https://ketex.com/trcgp/ckfinder/userfiles/files/72657317817.pdfIn PDF document text
    • https://www.penyembuhanholistikreiki.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607526c406a5d---delatadivemutigagigalo.pdfIn PDF document text
    • https://laughteronlineuniversity.com/images/upload/files/82717175744.pdfIn PDF document text
    • http://zzquansu.cn/d/files/vodotivomukixivatotexuf.pdfIn PDF document text
    • https://nam.it/wp-content/plugins/formcraft/file-upload/server/content/files/16082e66986761---waxurufixa.pdfIn PDF document text
    • https://www.hintonassociates.com/wp-content/plugins/super-forms/uploads/php/files/aa5ae6d7ef64a28c1cfe0cba3d79c0e7/78121324988.pdfIn PDF document text
    • https://www.cir.cloud/wp-content/plugins/formcraft/file-upload/server/content/files/16079f52b51c0d---96884984202.pdfIn PDF document text
    • https://beaufortbond.com/wp-content/plugins/super-forms/uploads/php/files/7a1202cfdb55b1c27812857547d73332/xuzusugojikomuwadu.pdfIn PDF document text
    • http://puppies-4u.com/clients/e/e7/e7f09595da74c05d2059c741134300d2/File/27296129643.pdfIn PDF document text
    • https://legacyltg.com/wp-content/plugins/super-forms/uploads/php/files/3641fa3d82e9bb1ad85a83da449738cd/gajijimipevemam.pdfIn PDF document text
    • http://alphabodysupplements.com/newerac2c/userfiles/file/84811479768.pdfIn PDF document text
    • http://cana.vn/uploads/userfiles/file/64525673631.pdfIn PDF document text
    • http://udmvdpo.ru/images/files/26470762362.pdfIn PDF document text
    • https://stcatherine.ac.ug/wp-content/plugins/formcraft/file-upload/server/content/files/160a1cb2ecc7bd---8216129512.pdfIn PDF document text
    • https://valubil.com/public/uploads/cms_file/cms_files/40473456510.pdfIn PDF document text
    • https://www.formwork.co.uk/wp-content/plugins/super-forms/uploads/php/files/60lf6k27fu4lr0rprevhn3tb28/54629469271.pdfIn PDF document text
    • https://traveletrust.com/basefile/traveletrustcom/files/66243306994.pdfIn PDF document text
    • https://local-atlas.ru/userfiles/files/pekuwejurer.pdfIn PDF document text
    • https://scalping.ir/data/files/file/97213896191.pdfIn PDF document text
    • https://kimansion.com/uploads/file/tesuxulusob.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_off0000d9a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9A9 15892 bytes
SHA-256: d951b1134601299362e4fae70a307ed30c37fabbd90fdb5fe124669ae73cce6d
font_01_sfnt_off00010276.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10276 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011a8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A8D 10588 bytes
SHA-256: 5d44062a6fd42d63820509f8d73123a60810839787a05939f069b4e057a851bf

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