Malicious PDF — malware analysis report

Static analysis result for SHA-256 d968d07ed525febc…

MALICIOUS

PDF

75.0 KB Created: 2021-09-06 18:55:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 57ef6a42e870fe468b7bb71154c760b9 SHA-1: 985d9d61c0b88e98e19410e61d759eda2bf03c24 SHA-256: d968d07ed525febc095d02821778d15371aeb52ad0a40aa1e509f2e55f053c29
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to various domains, many of which are associated with compromised CMS uploads or disposable hosting, indicating a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. While no scripts were directly extracted, the structure and URL patterns are consistent with malicious PDFs designed to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://smidgel.ru/uplcv?utm_term=slope+from+two+points+worksheet PDF link annotation
    • http://ydyb.com/filespath/files/20210821020255.pdfIn PDF document text
    • http://chinahongji.com/d/files/wilijulurotuxikegofowot.pdfIn PDF document text
    • http://puppiesulove.com/clients/7/7f/7fa6d7836ea929643a3c23f4562b158d/File/39571959578.pdfIn PDF document text
    • http://signauction.net/userfiles/file/71495529043.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/9n52lgie54j0tum8p4s6h27j85/kudelaxesiguwawowipesu.pdfIn PDF document text
    • https://namastehealth.in/wp-content/plugins/super-forms/uploads/php/files/bek8lca05m9q1jjpeusbpnc5i4/70344403373.pdfIn PDF document text
    • http://timnhanhonline.com/upload/files/pexuxalupixogedufadebinak.pdfIn PDF document text
    • https://ldoris.com/upfile/files/20210904070802.pdfIn PDF document text
    • https://masukpt2.com/contents//files/jawojajidowaxop.pdfIn PDF document text
    • https://nsaimmigration.com/userfiles/file/sogafel.pdfIn PDF document text
    • https://ev-owners.jp/userfiles//files/29904000636.pdfIn PDF document text
    • https://www.advids.co/wp-content/plugins/formcraft/file-upload/server/content/files/160ad5118a9f75---5216889830.pdfIn PDF document text
    • https://nomaquito-travel.com/editor-images/74730052761.pdfIn PDF document text
    • http://aiswaryamatrimonials.com/fck_uploads/file/87494156475.pdfIn PDF document text
    • http://brenno-tojestto.pl/userfiles/file/zuxomodagotukarut.pdfIn PDF document text
    • http://safetruck.gr/images/file/54869997371.pdfIn PDF document text
    • https://webgirls-studio.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c34357da48b---kobenor.pdfIn PDF document text
    • http://www.whirlpool-beachcomber.at/wp-content/plugins/formcraft/file-upload/server/content/files/160c49d7d928e3---10178770100.pdfIn PDF document text
    • https://feriaesotericadeatocha.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f78063bbf6---votibixopixe.pdfIn PDF document text
    • http://urbancollab.com/userfiles/Proj_Name//files/nemabi.pdfIn PDF document text
    • http://a-range.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a984a973e09---32750272727.pdfIn PDF document text
    • https://www.heainc.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607dcf8fcdaab---96351555383.pdfIn PDF document text
    • https://noukos.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160724ce7d7f69---46452422112.pdfIn PDF document text
    • https://www.axelendinggroup.com/wp-content/plugins/super-forms/uploads/php/files/89ca6b62430661bd08099251395d1e83/63911745748.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_off0000c298.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC298 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000daaf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAAF 10712 bytes
SHA-256: ab34eb790b1c68ab676f6a358bea5a592dc689d13a67d308a5f3b7f5073900ca
font_02_sfnt_off0000f318.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF318 17104 bytes
SHA-256: a6848691a4d2aa2ddeca8eae589e8e785eae61186d56618146b619f180bf7932