Malicious PDF — malware analysis report

Static analysis result for SHA-256 531f7513ed003214…

MALICIOUS

PDF

83.4 KB Created: 2021-09-12 22:35:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 034e92108a3e61b9268f27bb1fe250bf SHA-1: 223136395d77abb11327bfaa16f807518d40920d SHA-256: 531f7513ed00321441f2cb7222a7d8c933966daf0a00bd21e31749b8b6b87a5d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable domains, indicating a link farm designed to redirect users to potentially malicious content. The ClamAV detection and ML classifier strongly suggest a phishing or trojan payload is being distributed through these links. Although no scripts were explicitly extracted, the nature of the URLs and the heuristic firings point towards a malicious intent to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9923

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://nomylo.ru/uplcv?utm_term=ronja+la+hija+del+bandolero+pdf PDF link annotation
    • http://aquamedia.cn/ckfinder/userfiles/files/pekel.pdfIn PDF document text
    • http://melissajacksonmd.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135d38f91b7f---49715134317.pdfIn PDF document text
    • http://animalscipublisher.com/files/upfiles/file/93434572893.pdfIn PDF document text
    • http://xn--brneneskontor-landsforening-b0c.dk/userfiles/file/piribojidejunopiza.pdfIn PDF document text
    • http://datong-travel.tw/upload/ckeditor/files/20210902054413.pdfIn PDF document text
    • http://ergakiland.ru/files/files/73566022240.pdfIn PDF document text
    • http://rehahomecare.com/upload/editor/files/68389156873.pdfIn PDF document text
    • https://www.businesswatchguardingservices.co.uk/wp-content/plugins/super-forms/uploads/php/files/kcdvg5cqnhidedvgvq4vlvis2j/zewepejoxajagovelajenovo.pdfIn PDF document text
    • http://se-ty.com/uploads/userfiles/file/22816552575.pdfIn PDF document text
    • http://dogwarts.ru/sites/default/files/file/47398003778.pdfIn PDF document text
    • http://pappteam.hu/userfiles/file/mevewisuf.pdfIn PDF document text
    • http://luckdidea.com/ckfinder/images_store/files/61982678635.pdfIn PDF document text
    • https://europawindow.com/app/webroot/img/main_content/files/zulego.pdfIn PDF document text
    • http://ordineveterinarireggioemilia.it/userfiles/files/pubovisewakedupamimos.pdfIn PDF document text
    • https://geelaboba.dswip.com/ci/userfiles/files/18237245198.pdfIn PDF document text
    • https://avis-medical.ma/wp-content/plugins/super-forms/uploads/php/files/62063963975b6accc26a1379fd6a48e8/58664367796.pdfIn PDF document text
    • https://hgb.se/filer/file/33052487549.pdfIn PDF document text
    • http://mazdooradda.com/userfiles/file/sopuvovexede.pdfIn PDF document text
    • https://siphouse96.com/wp-content/plugins/super-forms/uploads/php/files/23ee0a896db8017260c5b08bec612cea/7065117300.pdfIn PDF document text
    • http://studiomanzetti.it/userfiles/files/dixenukupizotulegezeti.pdfIn PDF document text
    • http://sor1310.com/userfiles/file/39045961824.pdfIn PDF document text
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/botoder.pdfIn PDF document text
    • http://www.immo-uno.com/ckfinder/userfiles/files/16904729838.pdfIn PDF document text
    • http://pressvaluation.net/FCKeditor/editor/filemanager/connectors/userfiles/file/bakifela.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d37d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD37D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000eb8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB8F 19960 bytes
SHA-256: 03647c37f464aedd495d9c509497c307cd890266869ba652abf056c1a21a6359
font_02_sfnt_off00011e94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E94 2064 bytes
SHA-256: 46b41152c66239606199adeeb56fa6f0c95586cce1373289504480bb8e1ff93d
font_03_sfnt_off000127fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127FC 10644 bytes
SHA-256: bfdf64e2d68bf4859598df21ad7101ddf36de975cd0af58fd98edbb4a5680e1a

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