Malicious PDF — malware analysis report

Static analysis result for SHA-256 f62c13e37a76e22c…

MALICIOUS

PDF

74.0 KB Created: 2021-09-07 20:24:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: d4f1ba9038f670ef789c18d8a4101930 SHA-1: 69dc0fded506d56b2f873e96e75b8f499f41dca0 SHA-256: f62c13e37a76e22c589b56c77090003ada223767784d148d94372d3ec152e1d8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. Static analysis revealed it functions as a link farm, with numerous embedded URLs pointing to compromised WordPress sites and other disposable hosting. These links likely lead to further malicious content or phishing attempts.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://cooperspick.com/files/maguxaperejapivale.pdf In PDF document text
    • https://forumhotel.by/wp-content/plugins/super-forms/uploads/php/files/mcpqdnhrnci95s5rmd1eu4p491/77277702778.pdfIn PDF document text
    • https://www.euroservicemilano.it/wp-content/plugins/formcraft/file-upload/server/content/files/160fc60d7d8e5e---rajefurufugo.pdfIn PDF document text
    • http://dakhoanhanai.com/images/files/97194937790.pdfIn PDF document text
    • http://osullivanspressurewashing.com/wp-content/plugins/formcraft/file-upload/server/content/files/161059c50cf5d1---32419646067.pdfIn PDF document text
    • http://lbassicurazioni.it/file/21761466619.pdfIn PDF document text
    • https://www.lamuccacompany.com/wp-content/plugins/super-forms/uploads/php/files/0a656abc3ff345c8af1bebccbbdcfae1/rawukafigojoxag.pdfIn PDF document text
    • http://cameronhaddock.com/wp-content/plugins/formcraft/file-upload/server/content/files/16127c5357bb0f---kikugarijiwatalaga.pdfIn PDF document text
    • http://bassbasement.org/userfiles/file/80247338493.pdfIn PDF document text
    • http://pebyte.com/wp-content/plugins/super-forms/uploads/php/files/q17hgshhtci3r6oo3tuv4dmv1e/41440435053.pdfIn PDF document text
    • http://china-hold.com/UploadFile/file/20210603185011266.pdfIn PDF document text
    • http://moonlightmontessori.com/upload/files/12374175951.pdfIn PDF document text
    • http://www.leesii.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609444da8fe6e---88253014044.pdfIn PDF document text
    • http://sensor4you.com/fckeditor/editor/filemanager/connectors/php/fckeditor/upload/202109/file/63723271166.pdfIn PDF document text
    • http://srsheicha.com/uploadfile/file/toligomadorijoxap.pdfIn PDF document text
    • https://bilbox.es/wp-content/plugins/super-forms/uploads/php/files/ad5b181d798c7cfc1cfe4cfc841f1a87/dumajudopaxixof.pdfIn PDF document text
    • http://shuimotongyuan.com/userfiles/file/luvokuvolifageka.pdfIn PDF document text
    • http://ilkyoukais.com/Images/Media/files/semis.pdfIn PDF document text
    • http://svenstavik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a11151ea22---19576452691.pdfIn PDF document text
    • http://gaskinfamilyreunion.com/clients/b/b7/b798c9f9e2af69c3a5b950a06e4ade8e/File/jajegejowodijarop.pdfIn PDF document text
    • http://bvsaigonbinhduong.vn/uploads/files/zupixujupibele.pdfIn PDF document text
    • https://bjjewels.net/nbloom/fckuploads/file/89050316698.pdfIn PDF document text
    • https://djhelaly.com/wp-content/plugins/super-forms/uploads/php/files/c37409db489e3feffe2cec57a0288177/43505013751.pdfIn PDF document text
    • http://www.yoko-ono.be/images/userfiles/file/42668059963.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=easy+spoken+english+tamil+pdfPDF link annotation
    • 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_off0000bb0a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB0A 18204 bytes
SHA-256: cf806fa6bda1426ff4fe735c60829d861e2bbc14b08c8ce307e0bf6459d57664
font_01_sfnt_off0000e8bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8BB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000100d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100D2 11032 bytes
SHA-256: f70ae6d2535e8a24402149df93c6ed0f0c556b9ec474b2d7a8eb38795efae8d7