Malicious PDF — malware analysis report

Static analysis result for SHA-256 e9259cc12fac193e…

MALICIOUS

PDF

82.4 KB Created: 2021-09-09 11:46:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 763c0cf4d490b6c40c43021adb32270a SHA-1: eefc7bd8c9020d70f25613dc985589fe7a9c2cff SHA-256: e9259cc12fac193e2ab50720e25d70a5403c1bd32cd58d21a73076b60dde6065
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery through these links. No scripts were extracted, and the document body was unreadable binary data.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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 http://solarwindependence.com/ckfinder/userfiles/files/bafip.pdf In PDF document text
    • https://hexema.com/FCKeditor/file/28597109604.pdfIn PDF document text
    • https://sunsetlearningcenter.com/userfiles/file/mojesesik.pdfIn PDF document text
    • http://tobn56.com/UpFiles/file/11649748757.pdfIn PDF document text
    • http://xn----7sbqwxdbhblh2h.xn--p1ai/data/file/67644960355.pdfIn PDF document text
    • http://sinoscaform.com/upload/ckimg/files/202109060458529254.pdfIn PDF document text
    • http://chono.mn/uploads/userfiles/files/xobetosogofomo.pdfIn PDF document text
    • https://refundsrefunds.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135659bc946c---6304244023.pdfIn PDF document text
    • https://lederstuehle-shop.de/ckfinder/userfiles/files/53025274256.pdfIn PDF document text
    • http://isdoor.ru/uploads/files/tukegujaxapupoxili.pdfIn PDF document text
    • http://www.egymast-segito.hu/uploaded/fck/file/67551116683.pdfIn PDF document text
    • http://steelfurniturecn.com/d/files/21369747357.pdfIn PDF document text
    • https://jills.reviewz.eu/app/webroot/files/userfiles/files/60752380918.pdfIn PDF document text
    • http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16138580036e30---jutoxaxebagutafi.pdfIn PDF document text
    • http://usa-ex.com/images/blog/file/vagunolupopamojudafemu.pdfIn PDF document text
    • https://brusroom.com/wp-content/plugins/super-forms/uploads/php/files/d60c6a680e6f3eb707bf88af4fef53c1/magazomuvewafarate.pdfIn PDF document text
    • http://peaceinsrilanka.lk/userfiles/file/nejoxanokuzubemajadudugi.pdfIn PDF document text
    • https://capital-publishing.com/ckfinder/userfiles/files/zazalazutofaboz.pdfIn PDF document text
    • http://jumpinfit.it/userfiles/files/69200122889.pdfIn PDF document text
    • http://elmiraclassiccountry.com/wp-content/plugins/super-forms/uploads/php/files/0dfe020fd70586ceedb50a3e723cd1eb/lubozajozetek.pdfIn PDF document text
    • https://kamarkosong.com/contents/files/9226578170.pdfIn PDF document text
    • http://angel-conference.org/upload_fck/file/2021-9-2/20210902222114803564.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=watch+twilight+breaking+dawn+part+2+full+moviePDF 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_off0000d9e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9E3 11496 bytes
SHA-256: dc06b05473d6a2537567ce93ebd38c7bc64b8f6bdbeadf5468b3c31ae8edc6d8
font_01_sfnt_off0000f499.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF499 18160 bytes
SHA-256: 35435c70c2eeb1559afcd67a0f117f8f313d5346f75596235242879b36aa70ad
font_02_sfnt_off000123ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123CE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1