Malicious PDF — malware analysis report

Static analysis result for SHA-256 cd9a8e4dbf06ea46…

MALICIOUS

PDF

89.9 KB Created: 2021-08-22 05:02:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 041c435ccd74913e175d78be60c85bd5 SHA-1: f57a08290d9577ad0b53a2857097d95ef999fc89 SHA-256: cd9a8e4dbf06ea46193ff1ee75e4050113e8cd67b8b65a36a1d939c456663e88
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious File

The PDF file was flagged by ClamAV as 'Pdf.Phishing.Trojan' and an ML classifier indicated a high probability of maliciousness. Several heuristics indicate the PDF contains a link farm pointing to compromised or disposable hosting, likely intended to trick users into downloading further malicious content. The presence of numerous links and the use of 'utm_term' in one URL suggest a phishing or scamming attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9937

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://lineshare.net/upload/files/20210702082807.pdf In PDF document text
    • http://satunatc.ac.th/ckfinder/userfiles/files/9919345605.pdfIn PDF document text
    • http://moveisgarciadigital.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b4376f72816---23257735785.pdfIn PDF document text
    • http://apcmagon.com/userfiles/39529531124.pdfIn PDF document text
    • https://thesaddlebank.com/wp-content/plugins/super-forms/uploads/php/files/94kmi9j93fbrfd28gssvpt5554/71492092036.pdfIn PDF document text
    • https://www.elektrobetrieb-scholz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b6772a350ca---95113878484.pdfIn PDF document text
    • http://apluskleaning.com/admin/images/file/25660928506.pdfIn PDF document text
    • http://www.adanakursmerkezi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f21d9765931---mezewusebovixutasu.pdfIn PDF document text
    • http://stark-tools.ru/images/uploaded/parudemijif.pdfIn PDF document text
    • https://www.traveltimevipp.com/wp-content/plugins/super-forms/uploads/php/files/34e18d460da6128a9ccd7bb42ed0af64/gigur.pdfIn PDF document text
    • http://passaicvalleyclassof1957.com/clients/44362/File/24810822181.pdfIn PDF document text
    • http://caacoding.net/wp-content/plugins/formcraft/file-upload/server/content/files/160857d5583378---xeduliwukukijevenowerum.pdfIn PDF document text
    • https://hpx.com.ua/wp-content/plugins/super-forms/uploads/php/files/1888f7e959f76db4d8f2d69d6768021b/55317865464.pdfIn PDF document text
    • https://wurstfargo.com/wp-content/plugins/super-forms/uploads/php/files/b851bab4054840fb490918551f2ff36d/60835169039.pdfIn PDF document text
    • https://twfern.org/upload/ckfinder_temp/files/20210528185321.pdfIn PDF document text
    • http://haiqi-machine.com/d/files/vulabajo.pdfIn PDF document text
    • http://qiangka.com/ckfinder/userfiles/files/japinazugagurobabodiba.pdfIn PDF document text
    • http://unipell.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161218fc15d4a2---69629729478.pdfIn PDF document text
    • https://butterfly-propertymanagement.com/userfiles/file/27246220154.pdfIn PDF document text
    • http://wenxuezj.com/images/File/7830484820.pdfIn PDF document text
    • https://lcd96.ru/wp-content/plugins/super-forms/uploads/php/files/e0252503c9f4cd5dfe72bced272644a6/narubegemel.pdfIn PDF document text
    • http://sakaryakasaplarodasi.org/userfiles/file/42203163901.pdfIn PDF document text
    • http://austintownfitch1980.com/clients/879833/File/konafu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=esquadr%C3%A3o+suicida+download+dublado+1080pPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000df65.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF65 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f776.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF776 16504 bytes
SHA-256: ad4518f70b4e82d347ace2d249772a84f240b1ba80b8d9243b2b94c117309ca2
font_02_sfnt_off00010e5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E5A 19332 bytes
SHA-256: 799e385ce117a13fdf379c8abc5400874fcd66540a2ff7666cc4aa4d88786dff
font_03_sfnt_off00013d29.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D29 11380 bytes
SHA-256: a1387ad969bb42d20b7d7990508cacca011a256553cf5da96ad964db1d38ca0b

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