Malicious PDF — malware analysis report

Static analysis result for SHA-256 d19a3ed0aeee086b…

MALICIOUS

PDF

71.6 KB Created: 2021-09-21 23:08:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: a06d76ce209dd3411c7e36ae5a4eab2f SHA-1: 50249a1e759e9299114e2928df540c69e836d3e9 SHA-256: d19a3ed0aeee086b3448e58a8e252147bc4773b40979445c3220d6cd2cbf03bc
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. The document contains numerous external URIs and links to compromised CMS uploads, suggesting it is designed to lead users to malicious websites. The presence of embedded URLs and the link farm heuristic indicate a phishing or malware distribution attempt.

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://pistant.ru/uplcv?utm_term=redeem+code+for+minecraft+windows+10+free PDF link annotation
    • https://apgr.eu/UserFiles/file/rogupogafalegexobokujuxa.pdfIn PDF document text
    • http://donahoelawfirm.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/rixipusixuwukatifevagemoz.pdfIn PDF document text
    • https://pastijptoto.com/contents/files/xiguxodakilazo.pdfIn PDF document text
    • http://subventionsbetrug.de/wp-content/plugins/super-forms/uploads/php/files/6ootcudij7k438jpebktreso5n/52256295250.pdfIn PDF document text
    • http://leasingtowers.com/ckfinder/userfiles/files/55025445513.pdfIn PDF document text
    • http://icsbc.ru/fuploader/file/58265161631.pdfIn PDF document text
    • https://vvpta-irvine.org/userfiles/file/53610233235.pdfIn PDF document text
    • https://sabunwangi.com/contents/files/jufibenememamuniwise.pdfIn PDF document text
    • http://greenhere.cn/upload/ckimg/files/202109021617475354.pdfIn PDF document text
    • http://bagiez.com/userfiles/file/wukuvasugosumijizobewijo.pdfIn PDF document text
    • http://markasib.ru/ckfinder/userfiles/files/77471302539.pdfIn PDF document text
    • https://drmiamiconnect.com/wp-content/plugins/super-forms/uploads/php/files/2ec7094ed319c43ca63aa18e3b2d99c3/94498833214.pdfIn PDF document text
    • http://grafichesirio.com/userfiles/files/19761754024.pdfIn PDF document text
    • https://joepromenshealth.com/wp-content/plugins/super-forms/uploads/php/files/df0b68fc221da6814188edacca5fc012/24998715694.pdfIn PDF document text
    • https://widepolymers.com/userfiles/file/1015153313.pdfIn PDF document text
    • http://urbanconstructions.org/images/uploadedimages/file/63382854833.pdfIn PDF document text
    • https://macroedunet.com/userfiles/file/jovomuxavegelotinonapul.pdfIn PDF document text
    • http://inhome360.ru/admin/ckfinder/userfiles/files/64298092331.pdfIn PDF document text
    • http://parmalab.it/userfiles/files/sajulaxugereju.pdfIn PDF document text
    • http://hemeringen.de/ckeditor_ablage/userfiles/files/xipod.pdfIn PDF document text
    • http://baanpowertrain.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f8004bc8ff---70441215904.pdfIn PDF document text
    • http://medwin.kr/userData/board/file/61504143060.pdfIn PDF document text
    • https://eyescare.vn/app/webroot/upload/ckfinder/files/dubiwujoxuwo.pdfIn PDF document text
    • http://zhongguohuachun.com/d/files/woxivovizipovufixozumejer.pdfIn PDF document text
    • https://moniimpex.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130db152c4ee---92959096109.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_off0000b7d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB7D2 15252 bytes
SHA-256: 3481dced12cc25c4643b7af69470fc65937ecfc7bbe6b84d744bf1e1c353e30b
font_01_sfnt_off0000dee4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEE4 10896 bytes
SHA-256: 6f790e1acf76783d5da84a808d350da7821d820eb176a2f3700667f55ba71c7c
font_02_sfnt_off0000f838.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF838 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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