Malicious PDF — malware analysis report

Static analysis result for SHA-256 09cabc338a74f2b6…

MALICIOUS

PDF

88.6 KB Created: 2021-07-07 15:07:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: bd4197d04abc73f875288f2a67de5256 SHA-1: e7e206960387062961ac35a678e6aaaffbd738a7 SHA-256: 09cabc338a74f2b6b052c0a6a963f0d68fdb4842dc9bed65200c6d2a3e83b83e
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal that the document functions as a link farm, directing users to multiple compromised WordPress sites and disposable hosting domains. These links likely serve as a lure for phishing attacks or to distribute further malware payloads.

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://hps-gruppe.com/wp-content/plugins/super-forms/uploads/php/files/asiub9ak96oes9djmkascdjc21/mubumoxojopevaw.pdf In PDF document text
    • https://athensviptour.com/wp-content/plugins/super-forms/uploads/php/files/8a28b1437c39fcd1934f7bfa385528d0/lezodadutoxuri.pdfIn PDF document text
    • http://fairmonteast1969.com/clients/876766/File/77824009116.pdfIn PDF document text
    • https://perfecthospital.org/FCKeditor/file/pogokizuzij.pdfIn PDF document text
    • http://eske.hu/wp-content/plugins/formcraft/file-upload/server/content/files/160d1a04fd618c---tomefurakoferinemoragore.pdfIn PDF document text
    • https://xn----8sbaavnccwq4am.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/cd73e1d715fa445ea7ad79bc9b4c64b8/1611235139.pdfIn PDF document text
    • http://auapp.ch/userfiles/files/xawusuguka.pdfIn PDF document text
    • https://sketchup360.vn/wp-content/plugins/super-forms/uploads/php/files/b1epvpr5eqo21jhrrpub60t9i1/54011439367.pdfIn PDF document text
    • https://alexandrapanayotou.com/web/images/static/file/93324891018.pdfIn PDF document text
    • http://shqinze.net/admin/upimg/file///bevagunupuxoguxusozopexu.pdfIn PDF document text
    • http://sakirnoopo.ru/wp-content/plugins/super-forms/uploads/php/files/0a7e8a3ab79971469b127702b2d5df60/pekuduwasewinitewi.pdfIn PDF document text
    • http://prodesign31.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160e032568fd86---lufotaxifobujunol.pdfIn PDF document text
    • https://betonwerkendejonge.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16082aadc39545---54487881874.pdfIn PDF document text
    • http://www.playerclub.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160c952fdec0d9---gedodulewoges.pdfIn PDF document text
    • https://jclifeschools.org/wp-content/plugins/super-forms/uploads/php/files/6bc7ed88f97a6766f15b268b45a32f60/71385441251.pdfIn PDF document text
    • http://shmountaineering.co.uk/wp-content/plugins/super-forms/uploads/php/files/iccq011u1p6duavnr8e71bq150/lenavitovebenajetasemegex.pdfIn PDF document text
    • http://royalgoodviewresort.com/Uploads/file/xepazema.pdfIn PDF document text
    • http://www.aportecnica.com/imagenes/editor/file/norenarugisutixitox.pdfIn PDF document text
    • https://xo-sound.ru/userfiles/file/89486347976.pdfIn PDF document text
    • https://digireg.org/upload/torovujare.pdfIn PDF document text
    • http://degrossier.nl/uploads/file/86244333008.pdfIn PDF document text
    • http://dongphuctqueen.com/upload/files/51976749522.pdfIn PDF document text
    • http://mas.vacations/wp-content/plugins/formcraft/file-upload/server/content/files/160c9ac51408a7---zixiwofizumivogekal.pdfIn PDF document text
    • http://walkofagesvt.org/clients/0/0e/0e42319052772b195a43ba3ede0f03e0/File/9390667747.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=3rd+sunday+of+lentPDF 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_off0000f718.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF718 17248 bytes
SHA-256: ceb2bc7f1ee3ac353539abbcdf58a72890d21f24dfb995c01062be32382d19c7
font_01_sfnt_off000123ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123BA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013bd1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13BD1 10544 bytes
SHA-256: ffc5c7d9b01821243451386986643095836379e3670dbd346568a282675f72b4