Malicious PDF — malware analysis report

Static analysis result for SHA-256 57d1301e3d5fc8e7…

MALICIOUS

PDF

83.1 KB Created: 2021-07-23 13:00:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 6d4ed22a17a43114cf565b80553f6511 SHA-1: 6543f19bd253b06be0e719fe96ffa5e2ca08216c SHA-256: 57d1301e3d5fc8e763aa7febba38e32912e3fecdf5fd7cacfce732017b76150c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF was flagged by ClamAV as 'Pdf.Phishing.Trojan' and an ML classifier indicated a high probability of maliciousness. Heuristics identified it as a link farm, with many URLs pointing to compromised WordPress sites and disposable domains. This suggests the PDF is designed to lure users to malicious websites, likely for phishing or to download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://fixmyhelicopter.com/project-new/christianbook/upload_images/file/bemexenobe.pdf
    • https://www.olympusnorge.no/wp-content/plugins/super-forms/uploads/php/files/cvab9f1ug3u464p5a3931ei5vc/23946873388.pdf
    • https://tktravelkorea.com/FileData/ckfinder/files/20210708_F148A403EB10C87C.pdf
    • https://balticstroy.com/uploads/files/23338134314.pdf
    • http://argra.rs/wp-content/plugins/formcraft/file-upload/server/content/files/16080e602b0c4d---gipekupinamudutisovogenur.pdf
    • http://amwordpress.org/wp-content/plugins/formcraft/file-upload/server/content/files/160bd2ce97fb0d---tukiroxoxaki.pdf
    • http://www.gainerwindows.ca/wp-content/plugins/super-forms/uploads/php/files/4noqrdi4rcih1prqmhn6lbh5v7/tivimigaxef.pdf
    • https://thietbivesinhanhhuy.com/asset/files/28242211662.pdf
    • http://ordinate-ltd.com/file_media/file_image/file/20239875663.pdf
    • https://smsenerji.com/resimler/files/92158964518.pdf
    • https://tecsal.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a6f5b24d005---19997472533.pdf
    • http://www.radioemka.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d5e37749a70---kojeparajibifu.pdf
    • http://soleilboo.com/images/uploads/files/bevadagububulikekupavibor.pdf
    • http://wib24-admin.de/uploads/file/6952035325.pdf
    • http://www.sparkprototypes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b753c2bd004---fofofejabob.pdf
    • http://halvani.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a486d95a1a---duvit.pdf
    • http://jhdljz.com/userfiles/file/1624625344.pdf
    • http://cgt-fo-csc.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160aa25803299d---jeluxaj.pdf
    • http://www.canadavisaservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d87a9bf6be---49437628078.pdf
    • https://christembassyromford.org/wp-content/plugins/super-forms/uploads/php/files/bffd9140c476e41e51537f30b4b36588/xawuzupudoveduzuxabu.pdf
    • http://eske.hu/wp-content/plugins/formcraft/file-upload/server/content/files/1607585bdac74f---7683003514.pdf
    • https://et-auditing.com/userfiles/files/xozurakupanajigujifajid.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=where+the+mind+is+without+fear+text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e219.bin
95294f3e97846b5e5f36cd44d00735361d2eb1cf35ad91742a146da4af7f6f99
pdf-font-stream PDF embedded font (sfnt) at offset 0xE219 16728 bytes
font_01_sfnt_off00010da2.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10DA2 16792 bytes
font_02_sfnt_off000125b9.bin
27e4a03dc9fc4cfe792aa3a4f89b4d5e43333ed8ebc45026392f952dcf3d2345
pdf-font-stream PDF embedded font (sfnt) at offset 0x125B9 10856 bytes