Malicious PDF — malware analysis report

Static analysis result for SHA-256 c1a72b123fd69d71…

MALICIOUS

PDF

82.4 KB Created: 2021-09-06 19:18:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: ab1112aec148afb37b48ef759a438004 SHA-1: d112f3a49ad066bb29b500852946d5d12e9f5776 SHA-256: c1a72b123fd69d71984e5e9d5efc0971cea77643ccd3ff86c757fccd6c7384ae
156 Risk Score

Malware Insights

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

The PDF was flagged by ClamAV as a phishing trojan and by an ML classifier as malicious. Heuristics indicate it functions as a link farm, with numerous URLs pointing to compromised WordPress sites and disposable hosting. The document body is heavily obfuscated, but the presence of multiple embedded URLs strongly suggests an intent to redirect users to malicious content, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://objetivovender.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b8b167ac55---53391429073.pdf In PDF document text
    • http://parkwestresidences.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610cf4144e0a7---15564708647.pdfIn PDF document text
    • http://eva.am/files/efb372b49e257f47.pdfIn PDF document text
    • http://bachtungcompany.com/upload/files/77998100870.pdfIn PDF document text
    • http://agcslohian.com/userfiles/file/varavepusededenapuxa.pdfIn PDF document text
    • https://sona3elkhair.com/userfiles/file/53775249076.pdfIn PDF document text
    • http://sportingclubalbinia.eu/userfiles/files/41846982472.pdfIn PDF document text
    • http://matstravel.ru/userfiles/file/54011992921.pdfIn PDF document text
    • https://wkd-uk.com/wp-content/plugins/super-forms/uploads/php/files/fdeaac1c14ee716b3e715484886056f1/21066410393.pdfIn PDF document text
    • https://www.hdcorp.com.br/wp-content/plugins/super-forms/uploads/php/files/uegs0juak04mtk0i092fv1np8i/55910832636.pdfIn PDF document text
    • https://tecsal.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608e32583927f---32356998929.pdfIn PDF document text
    • https://jennysbooks.com/wp-content/plugins/super-forms/uploads/php/files/63f34f3e5469dcb26b0a6fadda0789b8/vadupimunixir.pdfIn PDF document text
    • http://csc025.com/userfiles/file/20210614010305_z4x6xp.pdfIn PDF document text
    • https://bomberosdenavarra.com/userfiles_nexo/files/zafejenideluxetafojobu.pdfIn PDF document text
    • http://imapbook.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/kireremitak.pdfIn PDF document text
    • https://hargagila.com/uploads/image/files/5259125085.pdfIn PDF document text
    • https://jollytime.ru/wp-content/plugins/super-forms/uploads/php/files/637aadfaffe3623612956bc1f1b2bc34/23443835672.pdfIn PDF document text
    • https://gachbinhduong.com/upload/file/86299731136.pdfIn PDF document text
    • http://chistogood.ru/admin/ckfinder/userfiles/files/weraroxaxugoxikuj.pdfIn PDF document text
    • https://petroblend.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c1051f299a0---soledibawewikanuletusaki.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607d04576b0f4---kamaziraj.pdfIn PDF document text
    • http://www.knickmeier.net/images/pageimg/file/wigomabu.pdfIn PDF document text
    • https://rux-thai.com/ckfinder/userfiles/files/88181059331.pdfIn PDF document text
    • http://sarlampa.ru/upload_picture/sejujidiludogesesosinoti.pdfIn PDF document text
    • http://uticachemical.com/files/upload/files/81549444727.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=suretemp+plus+692+service+manualPDF 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_off0000d9fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9FE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f210.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF210 18396 bytes
SHA-256: cc4bb7473c400e8ad79f2d3c3af247730cc5647294f171a3ef05fcf580c16118
font_02_sfnt_off00012140.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12140 11112 bytes
SHA-256: 53f8b592d71ab7450fcba00815e3712e947a823aaa47b1d355392009c7fca35c