Malicious PDF — malware analysis report

Static analysis result for SHA-256 b57e0e9d20ac7d6a…

MALICIOUS

PDF

84.5 KB Created: 2021-09-07 18:21:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: e90034428c0724fed95c2dc1f43162fa SHA-1: 84e9ed48888550db4c1f3dd9cf61c10e8965da47 SHA-256: b57e0e9d20ac7d6a5cbfed8e1079fcf3edd9753c90e0881f89196c2fa8a5901b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a link farm, directing users to numerous external URLs. Several of these URLs point to compromised WordPress upload directories, indicating a potential phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly suggest malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 http://www.suffaheducation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab86fd9f5d2---93660307888.pdf In PDF document text
    • https://alkalacarservice.com/public_html/userfiles/file/12086213180.pdfIn PDF document text
    • http://dblbtech.com/userfiles/file/lipavekujalumot.pdfIn PDF document text
    • http://residenceraffaellotorino.com/userfiles/files/87251671093.pdfIn PDF document text
    • http://amuseonline.com/absite/userfiles/file/wekeriluxezo.pdfIn PDF document text
    • https://edoxmarketing.com/wp-content/plugins/super-forms/uploads/php/files/qj288ofabmno8q710adi378hlf/rekelunujibala.pdfIn PDF document text
    • https://www.adler-leitishofen.de/wp-content/plugins/formcraft/file-upload/server/content/files/160e39ef50cb45---64894760704.pdfIn PDF document text
    • https://regenerativetherapyforpain.com/wp-content/plugins/super-forms/uploads/php/files/d9383131aee73f7a01a3c7694df3226b/79124629047.pdfIn PDF document text
    • http://www.flamanville-76.fr/upload/file/93851538343.pdfIn PDF document text
    • https://www.parkgest.ch/wp-content/plugins/formcraft/file-upload/server/content/files/16096fe7c60208---32686964467.pdfIn PDF document text
    • https://www.enviedecrire.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b424bb8c1e---luxuxubikexitapanazulotoj.pdfIn PDF document text
    • https://rosemonttherapy.health/wp-content/plugins/super-forms/uploads/php/files/aa5aqmt1q6g9qq2lk3dtblhh8e/33523030676.pdfIn PDF document text
    • http://verkoop-je-wagen.be/wp-content/plugins/formcraft/file-upload/server/content/files/160c08fff6e52e---48275662454.pdfIn PDF document text
    • https://lienlacanien.com/img_pages/file/29588009943.pdfIn PDF document text
    • https://congtydaihai.com/upload/files/20886150006.pdfIn PDF document text
    • http://basaritarim.net/admin/editor_resim/file/33089968724.pdfIn PDF document text
    • https://1sis.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cf90aa6fe27---wolemokixefovije.pdfIn PDF document text
    • https://catbasailing.com/upload/fck/file/41688221841.pdfIn PDF document text
    • http://plnjl.com/userfiles/files/wenegarejivapuzo.pdfIn PDF document text
    • http://ugrctrani.it/userfiles/files/59648564276.pdfIn PDF document text
    • http://barrarioservicos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b744d37a99d---67860070459.pdfIn PDF document text
    • http://importfoodfair.com/userfiles/image/2021/08/file/90683079767.pdfIn PDF document text
    • http://sportsbettingconsultants.net/cote_dor_import/admin/ckfinder/userfiles/files/zolepajubegedubon.pdfIn PDF document text
    • https://nmg.lv/img/uploads/files/morixanusaf.pdfIn PDF document text
    • http://www.dnevi-sekretarjev.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16092480aba7be---vuderumewibilibaluleziken.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=connect+the+dots+worksheets+1-500PDF 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_off0000e586.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE586 17924 bytes
SHA-256: e0a884eae602079f0f2388cf4bdb5abdf836d9a2d0ab8e6301da3ef49d07c8f6
font_01_sfnt_off00011404.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11404 10720 bytes
SHA-256: 18f588d23ff8a290a5e4b6f8b1204ab9d62a5ab9c44a8eb7c5b25d549d23202f
font_02_sfnt_off00012ccc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CCC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1