Malicious PDF — malware analysis report

Static analysis result for SHA-256 8b04c18314445256…

MALICIOUS

PDF

81.2 KB Created: 2021-09-05 03:44:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: e22311fd89879afc3660afae69822762 SHA-1: f57407b9d921423cc1d6ed7348830d25f0ad8d1e SHA-256: 8b04c18314445256cc677e69e915e026e4ec86272e013ac3890fffc9d7c99d40
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to multiple external URLs, some hosted on compromised CMS platforms. The primary URL suggests a lure for cracking software, a common phishing tactic. No scripts were extracted, but the embedded URLs are the main indicators of compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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://irlanc.ru/uplcv?utm_term=nitro+pdf+pro+11+crack+download PDF link annotation
    • https://acethamessecurity.co.uk/wp-content/plugins/super-forms/uploads/php/files/822b6cffcc7b423ac0b84468bdc7ad6f/26457349480.pdfIn PDF document text
    • http://hgbs.de/userfiles/file/89124082822.pdfIn PDF document text
    • http://audiomaster.se/wp-content/plugins/formcraft/file-upload/server/content/files/1609053d3c4e8b---18378263838.pdfIn PDF document text
    • https://www.pfgpartners.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1606c7fdf94ce1---36173254123.pdfIn PDF document text
    • http://brodart01.com/wp-content/plugins/super-forms/uploads/php/files/234pbsooq9eltmuvb3e68883kl/tukorulavedikilutizur.pdfIn PDF document text
    • http://www.melodypods.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608539ed473e7---75263636769.pdfIn PDF document text
    • http://malbreil.com/userfiles/file/mamibozuxiv.pdfIn PDF document text
    • https://www.bakirkoytemsilcisi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e0f6b0a535---29584701355.pdfIn PDF document text
    • https://belgradenightlife.info/wp-content/plugins/super-forms/uploads/php/files/0njj57fk6p7j2stpkicv5fk28e/tixojisobuto.pdfIn PDF document text
    • http://goldnumber.info/userfiles/file/wanenir.pdfIn PDF document text
    • http://webscape.co.bw/wp-content/plugins/formcraft/file-upload/server/content/files/1609c28801a8a9---tebuligipinezujipamalavut.pdfIn PDF document text
    • http://voszveszprem.hu/_user/file/pelobazi.pdfIn PDF document text
    • http://cuatro-pr.org/sites/default/files/file/29024914142.pdfIn PDF document text
    • http://toeicspeaking.net/_UploadFile/Images/file/vifojuwomolagerobesum.pdfIn PDF document text
    • https://alphaveneers.co.uk/wp-content/plugins/super-forms/uploads/php/files/7d439e67a75ae7eec6c41c082dde8740/repafijovaxap.pdfIn PDF document text
    • https://aslimitada.com/userfiles/file/sigifiwubogunarataganud.pdfIn PDF document text
    • http://profesniprukaz.cz/ckfinder/userfiles/files/vugoxogigi.pdfIn PDF document text
    • http://www.dfdtrading.sk/ckfinder/userfiles/files/noboforojixukixerunatonik.pdfIn PDF document text
    • https://arredamentigiacobbe.it/file/gomutopixe.pdfIn PDF document text
    • https://tradegateindia.com/userfiles/file/89382825350.pdfIn PDF document text
    • https://www.helpforbusymums.com/wp-content/plugins/super-forms/uploads/php/files/720ba9bb553047f180d1867fd0b109d2/6588369347.pdfIn PDF document text
    • http://stellarp.com/userfiles/files/lodorulimiret.pdfIn PDF document text
    • https://appchecar.com/ckfinder/userfiles/files/74029605388.pdfIn PDF document text
    • http://www.vivelamusica.es/wp-content/plugins/formcraft/file-upload/server/content/files/160985b8a0f0d3---patejesulajunoziwoxi.pdfIn PDF document text
    • http://wernersuarez.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/37972628047.pdfIn PDF document text
    • http://sl-light.ru/design/img/upload/file/fuworevunaj.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_off0000d50f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD50F 10520 bytes
SHA-256: f0025680d5699f9677ac56310648ae9f416b3936e6bee9654a23a7b02ac5d6b4
font_01_sfnt_off0000ed42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED42 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010554.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10554 19804 bytes
SHA-256: 07ed5f8a2d5fe99bfabd3d706a7404fe730e9622521c80b80fd287601c3d8ba6

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