Malicious PDF — malware analysis report

Static analysis result for SHA-256 b430f5dd457ce3b5…

MALICIOUS

PDF

71.9 KB Created: 2021-09-03 21:04:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: f69b304f73787d08b0ee33b467009454 SHA-1: c5ab4c16aaa6bf49fb1fbea00a6d65becb9c0ab2 SHA-256: b430f5dd457ce3b5d3fab3494216e57db514fd5327343eb2d2e2505c411668b8
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 domains associated with compromised CMS uploads 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, so the rationale is based on the URL analysis and heuristic firings.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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://finatwork.com/userfiles/file/xadowezibatazoke.pdf In PDF document text
    • http://zzps.pl/userfiles/file/podej.pdfIn PDF document text
    • http://zhengfutz.com/v15/Upload/file/20215231856429968.pdfIn PDF document text
    • https://gtsonline.nl/wp-content/plugins/super-forms/uploads/php/files/f6ron3pcg8q8ojr24o9j8ieqt8/54090880679.pdfIn PDF document text
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/ca0fe7b50360c7ab408e899404393534/65160830662.pdfIn PDF document text
    • https://jnvhardoi.org/ckfinder/userfiles/files/1468163479.pdfIn PDF document text
    • http://isisthailand.org/file_media/file_image/file/24514269272.pdfIn PDF document text
    • http://d-a-s.cn/userfiles/file/xeporirenoveropa.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/160e7c3df10d32---tesukojur.pdfIn PDF document text
    • http://rzn-house.ru/upload/file/lajozusikisuwu.pdfIn PDF document text
    • http://prinsart.ro/uploads/files/8935830104.pdfIn PDF document text
    • https://advancedcheckcashadvance.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d532282a0c---86878081132.pdfIn PDF document text
    • https://www.pfgpartners.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608325360c6cc---zepokuwizolove.pdfIn PDF document text
    • http://www.gunyagder.org.tr/wp-content/plugins/super-forms/uploads/php/files/mk5ge1re70f4aeek8o8ns6lu33/duranitiripitumupojos.pdfIn PDF document text
    • https://www.lucaslobker.com/minor/ckfinder/userfiles/files/97297162423.pdfIn PDF document text
    • https://siyata.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1608b5decef64b---luzipixokuzofalatilus.pdfIn PDF document text
    • https://ambalatender.com/upload/files/jukefiselotusetukufat.pdfIn PDF document text
    • https://yaslibakicisi.net/userfiles/file/dumuluwosaza.pdfIn PDF document text
    • http://arisutour.com/ckupload/files/gexumonagixakubogovi.pdfIn PDF document text
    • http://littlepearlbooks.in/data/eimages/file/92500063649.pdfIn PDF document text
    • https://www.tifdip.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ada9945829---67934077592.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=17+sustainable+development+goals+and+169+targets+pdfPDF 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_off0000b6d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB6D9 15884 bytes
SHA-256: 5d0d66673663a475f0956ba75a04b5f4a68ec936c87cc081e1ef894f61ffdd38
font_01_sfnt_off0000de96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE96 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f6ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6AD 11488 bytes
SHA-256: 2fc64c27ffba36c7cd706fb8ab5c167996a5dde1d19cdf1e294539ee012bfd22

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