Malicious PDF — malware analysis report

Static analysis result for SHA-256 df1f98c0db9d6c04…

MALICIOUS

PDF

76.9 KB Created: 2021-09-02 06:34:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 17f76682b5a6f2f21a6e2cc8a4155b8a SHA-1: 7e3689d7574935f5f8aeb820eea2e08cfa2324f5 SHA-256: df1f98c0db9d6c0448682a5707eaaaef3b4d7258e4a45701c259c9833896c787
156 Risk Score

Malware Insights

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

The ML classifier and ClamAV detection strongly indicate malicious intent. The PDF contains numerous links pointing to compromised WordPress upload directories and other disposable hosting, suggesting a phishing or malware distribution campaign. The presence of link farms and UTM parameters indicates an attempt to obscure the final destination and track user engagement.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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://allytemp.ru/uplcv?utm_term=graphic+rating+scale+pdf PDF link annotation
    • http://gibisch.org/files/files/lorebanapezidawunirep.pdfIn PDF document text
    • http://friluftsgruppen.se/wp-content/plugins/formcraft/file-upload/server/content/files/160a60a7202d67---71508553087.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fc9130e6638---fabenajesarusidoxefara.pdfIn PDF document text
    • https://www.rogierstoel.nl/wp-content/plugins/super-forms/uploads/php/files/u5kpql4v34msck3js23645blhd/90601480276.pdfIn PDF document text
    • http://www.hz-kontejnery.cz/ckfinder/userfiles/files/kinililirabufutobulo.pdfIn PDF document text
    • http://www.siscbolivia.com/admin/uploaded/fck/file/22105158848.pdfIn PDF document text
    • http://www.danvillern.com/wp-content/plugins/super-forms/uploads/php/files/g7nehu4uqkcqk90k9k471c31a0/vomokubafat.pdfIn PDF document text
    • http://museodegliarazzimarsala.com/userfiles/files/ratapil.pdfIn PDF document text
    • https://cashofferoregon.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f98a7192f89---poxofobibiwuwijazisinipu.pdfIn PDF document text
    • http://andreevmag.com/wp-content/plugins/super-forms/uploads/php/files/e5e90de8cfa850d97d4150a600bb86b9/gubirovobuva.pdfIn PDF document text
    • http://andreagarciam.com/wp-content/plugins/formcraft/file-upload/server/content/files/161043170ea46f---63602159279.pdfIn PDF document text
    • http://quaint-house.com/images/blog//file/wutaxuk.pdfIn PDF document text
    • https://admonks.ru/wp-content/plugins/super-forms/uploads/php/files/1529c69329eef46db71e605235896f7a/wonapedivukopef.pdfIn PDF document text
    • https://adsbudget.net/userfiles/file/46682036447.pdfIn PDF document text
    • http://dep14kirov.ru/userfiles/file/80179551608.pdfIn PDF document text
    • https://alkhairi.co.uk/wp-content/plugins/super-forms/uploads/php/files/f6c2ce629ff0dce1c43ffb0e48c832b1/10927366201.pdfIn PDF document text
    • https://quaint-house.com/xonemuraxagax.pdfIn PDF document text
    • http://soldresold.com/Shradhdha-Mehra/soldresold/final/ckeditorimage/files/tidagogivax.pdfIn PDF document text
    • http://salonlomi.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16095641f4c98c---52910420035.pdfIn PDF document text
    • http://peaceinsrilanka.lk/userfiles/file/duvisesitudegafejiviro.pdfIn PDF document text
    • https://designclarf.it/file/babosadeforod.pdfIn PDF document text
    • https://muzeumkonstancina.pl/attachments/file/34139303517.pdfIn PDF document text
    • http://highspiritsmusic.com/ckfinder/userfiles/files/75828403591.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_off0000cb05.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB05 16468 bytes
SHA-256: 80c763a115c92914be7a78a7b6539d8daaced86338105a65474889ce278bbf4d
font_01_sfnt_off0000f4b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4B1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010cc8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CC8 10816 bytes
SHA-256: 31de6eabe70ee2b6392713d5724256695812a9283234d9ca2375b088ad72365a

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