Malicious PDF — malware analysis report

Static analysis result for SHA-256 5e83d0156ef97869…

MALICIOUS

PDF

97.6 KB Created: 2021-07-30 14:27:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 58d4a7588dfa757b5c97bc3d979b4d60 SHA-1: 269ece52a4f51189e37a0d33e9e003aa792e32ca SHA-256: 5e83d0156ef978692bfec0c0bf27c7e6809615dbddc49928218d5d3cee634241
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The file contains numerous embedded URLs, many pointing to compromised WordPress installations, suggesting it functions as a link farm. These links likely lead to phishing pages or further malware downloads, aligning with a spearphishing attachment attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://irlanc.ru/uplcv?utm_term=adjectives+describing+places+worksheet+pdf PDF link annotation
    • https://refundsrefunds.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9981b5a4c4---kowufexogibojel.pdfIn PDF document text
    • http://www.mkkdigital.pt/wp-content/plugins/formcraft/file-upload/server/content/files/16073bd36204af---zukagixexafejifexorus.pdfIn PDF document text
    • http://textingrights.com/userfiles/files/84649347448.pdfIn PDF document text
    • http://hongshengfish.com/uploadfiles/20210730/210730045510419395waypzkc85czi.pdfIn PDF document text
    • https://www.charityweiss.de/wp-content/plugins/formcraft/file-upload/server/content/files/16085ed99a2331---68625146178.pdfIn PDF document text
    • https://backcountryplayground.com/wp-content/plugins/super-forms/uploads/php/files/92666067f5be1f1611598149e69ad63c/94951911537.pdfIn PDF document text
    • http://positiveforce.in/uploads/files/32550870026.pdfIn PDF document text
    • http://topcudental.com/img/userfiles/files/rexakaloxakiwuzeras.pdfIn PDF document text
    • http://limpiasol.com/wp-content/plugins/formcraft/file-upload/server/content/files/160869b6217fc4---67399630453.pdfIn PDF document text
    • http://banphimchuot.com/userfiles/file/xetidusonepijofadu.pdfIn PDF document text
    • https://spherule.org/wp-content/plugins/super-forms/uploads/php/files/6fef6ac08293296b272d8ab8d572c0b3/xuzazoxarevejulorufajinug.pdfIn PDF document text
    • http://seabeachthailand.com/UserFiles/file/saloru.pdfIn PDF document text
    • https://expungemyrecordnj.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f568318ef1f---falabivusotexajipajabumo.pdfIn PDF document text
    • https://reifenscho.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607f597f64b0e---45246262167.pdfIn PDF document text
    • http://fixmyhelicopter.com/project-new/christianbook/upload_images/file/1428895177.pdfIn PDF document text
    • http://andlupa.com/userfiles/file/78586051763.pdfIn PDF document text
    • http://pathtojanna.com/userfiles/files/wufunoforonidi.pdfIn PDF document text
    • http://wallsfamily1912.com/clients/876683/File/75959494734.pdfIn PDF document text
    • https://pankalconstructora.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b43da6a85db---jufifotarojunuv.pdfIn PDF document text
    • http://ksklinika.ru/ckfinder/userfiles/files/regakazobi.pdfIn PDF document text
    • https://armandofalconi.net/userfiles/file/17103811370.pdfIn PDF document text
    • http://www.companyforte.com/imagenes/editor/file/runaroviju.pdfIn PDF document text
    • http://imssp.by/data/images/fxeditor/file/waxofaxeviran.pdfIn PDF document text
    • https://verandapattaya.com/userfiles/files/33766419592.pdfIn PDF document text
    • http://babyschultz.com/clients/72285/File/96979762929.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_off0001144e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1144E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00012c60.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C60 18520 bytes
SHA-256: 20f5ae3cd9b8ed9ba3c9fec0e6736f65c9e31b5105896708f0778abc4a26619b
font_02_sfnt_off00015b3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15B3C 11392 bytes
SHA-256: b6c29e32eec2d21356588e4aa44a7a6d1be71a153df7847ad2f3c018a5dc0db7

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