Malicious PDF — malware analysis report

Static analysis result for SHA-256 f9a82526fe07d816…

MALICIOUS

PDF

83.7 KB Created: 2021-07-25 14:00:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: a5308380c9262872de3331deea9c44e7 SHA-1: 01de72027e5b4726d625023d075933005dc6e692 SHA-256: f9a82526fe07d81651c253e9605a00a2ce6d86794b9fd6c864c566f3ba69e83e
156 Risk Score

Malware Insights

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

The PDF contains a link farm directing to multiple websites, many of which appear to be compromised WordPress installations hosting PDF files. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of numerous external URIs and the 'link farm' heuristic suggest the primary purpose is to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://bokseinstituttet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160a3bcb4be419---timiviwasabuwopuxog.pdf In PDF document text
    • https://luathoanghuy.com/uploads/files/gulaguzinuloret.pdfIn PDF document text
    • https://boumqueur-edition.com/upload/fckeditor/file/bawawaxodesegiwa.pdfIn PDF document text
    • https://ohligschlaeger-berger.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c3ed199f566---dazazebejirasuzoz.pdfIn PDF document text
    • https://metroguards.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1606f13c5eebef---lebera.pdfIn PDF document text
    • https://agatanorek.com/files/file/67470067334.pdfIn PDF document text
    • http://fishtech.org/uploads/userfiles/file/file/wubibokovemomisazis.pdfIn PDF document text
    • http://villaturri.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a79b43bd45f---13429483586.pdfIn PDF document text
    • http://smartcookieacademy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071adff19858---pimenofibotem.pdfIn PDF document text
    • https://www.pietri-automobiles.com/wp-content/plugins/super-forms/uploads/php/files/o6ldmrt79b1jmd1fctt6g7b0iv/fexetufon.pdfIn PDF document text
    • http://www.fattyweng.com.sg/wp-content/plugins/formcraft/file-upload/server/content/files/16089d447018e9---xokamolefekuratiw.pdfIn PDF document text
    • https://nanosoft.mn/images/content/File/revalevavo.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a6fa25dd9f8---86710823494.pdfIn PDF document text
    • https://smilepath.com.au/wp-content/plugins/super-forms/uploads/php/files/2fa249f4d90f610d0b7ad6f8bde4c82d/89417647245.pdfIn PDF document text
    • http://nenorm.com/files/files/dobede.pdfIn PDF document text
    • https://cherrychile.cl/cherry/uploads/contenido/files/migosorigeguk.pdfIn PDF document text
    • https://pet-fashion.ro/mm/file/22897090904.pdfIn PDF document text
    • http://lev-steklo.ru/userfiles/file/vosedojezupena.pdfIn PDF document text
    • https://fedico.ca/upload/editor/file/80840768401.pdfIn PDF document text
    • https://mangmalungtea.com/userfiles/file/legakovetudamuletiwu.pdfIn PDF document text
    • http://sieuthibongda.net/ckfinder/userfiles/files/jexunudegimomoregivagoxab.pdfIn PDF document text
    • http://branonperformance.com/ckfinder/userfiles/files/miwidufibufuvuxa.pdfIn PDF document text
    • http://animationcoach.com/userfiles/file/6593322191.pdfIn PDF document text
    • http://przedszkolenisko.pl/userfiles/file/47243864016.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=wedding+newspaper+template+word+freePDF 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_off0000e192.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE192 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f9a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9A4 17636 bytes
SHA-256: cfecade779b731570e1cc96640731f2f8b7fe2856dbe1caf2bb957750afd9cf7
font_02_sfnt_off00012824.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12824 10920 bytes
SHA-256: 8885b6dded93e32ec91e3b9b4502179ff315d0f26876b7f4b0d661f58885a25d

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