Malicious PDF — malware analysis report

Static analysis result for SHA-256 97ac81c360f3bc27…

MALICIOUS

PDF

89.4 KB Created: 2021-07-20 08:15:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 39c8e38f80655d40d0f7859eb81d9208 SHA-1: 490942f35383bf10aa73904095f84f9ea1472cea SHA-256: 97ac81c360f3bc27e3ab886bc55562a6be180afeb7b4cbb50c38670da30ba4fc
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised CMS upload directories, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the nature of the links and the detection results point towards a malicious PDF designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://www.tai.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160985bdbe903b---1774036516.pdf In PDF document text
    • https://bistakalikotenetwork.com/userfiles/file/zufimu.pdfIn PDF document text
    • http://rollfactorytogo.com/uploads/files/ratexuzawubeserewi.pdfIn PDF document text
    • https://beldaoyun.com/calisma2/files/uploads/70458864693.pdfIn PDF document text
    • https://www.azembay.com/wp-content/plugins/super-forms/uploads/php/files/1cd02bund32jpq0am5e9mjkms5/17862361179.pdfIn PDF document text
    • http://bielwod.com/userfiles/file/xebuwiv.pdfIn PDF document text
    • https://www.bluegreenshouseboats.in/wp-content/plugins/formcraft/file-upload/server/content/files/160a3321ea01a8---munekoworamonorenizise.pdfIn PDF document text
    • https://doitsolutions.co/wp-content/plugins/super-forms/uploads/php/files/c2ceb7b668408d9f9d52a0de2db78934/70933073619.pdfIn PDF document text
    • https://rhuyscampingcar.fr/images/files/24585874612.pdfIn PDF document text
    • https://nhakhoaanphuoc.vn/uploads/files/80644948125.pdfIn PDF document text
    • https://bellevuecommunityfoodbank.org/wp-content/plugins/super-forms/uploads/php/files/725d5905eaf6f15eaa778367ad3fdd64/46869194767.pdfIn PDF document text
    • https://www.clubmanizales.com.co/wp-content/plugins/formcraft/file-upload/server/content/files/16075c5b09ca30---zuzitalamigisizuso.pdfIn PDF document text
    • http://cadeco.com/testingsites/advantage_aviation/assets/media/file/lisowekewogi.pdfIn PDF document text
    • http://pushgroup.lv/userfiles/files/xulutivaxo.pdfIn PDF document text
    • https://macleanpinesdrivingschool.com.au/wp-content/plugins/super-forms/uploads/php/files/85106e08293b54be199f1e23cbdd824e/zufegimomideterow.pdfIn PDF document text
    • https://inchirierielicopter.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1608e2a5394b4e---nuravamubuguvuzawamuvuja.pdfIn PDF document text
    • http://oinworkshop.com/clients/6/6d/6d9161a7191ba42f41383a85782e2f4f/File/34568468771.pdfIn PDF document text
    • https://divorcioconsensual.com.br/wp-content/plugins/super-forms/uploads/php/files/abcee0c1aa91b926ac367fb16955e3bb/92028883550.pdfIn PDF document text
    • https://studio45.live/wp-content/plugins/super-forms/uploads/php/files/pm6od7t044fl6jbi9ppk0kbje2/65709801.pdfIn PDF document text
    • http://www.mustwalge.ee/data/content/files/mofarefupazewimen.pdfIn PDF document text
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/160963120709e5---98660792675.pdfIn PDF document text
    • http://monroe74.com/clients/871877/File/vidowow.pdfIn PDF document text
    • https://fullprotec.com/ckfinder/userfiles/files/damenigo.pdfIn PDF document text
    • http://aitrans.cn/UploadFile/file/F1202106180158347409.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=the+north+central+plainsPDF 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_off0000f4b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4B0 10432 bytes
SHA-256: e5f917f42f1f5a721ef14677e3c0eb021bebb23682d601a011e1110bdfdf1c56
font_01_sfnt_off00010c49.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C49 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001245b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1245B 20824 bytes
SHA-256: 20b835c09a4e152086be9e87af4a34f804e9f4020b02ce0b8b012c75ede2e9a9

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