Malicious PDF — malware analysis report

Static analysis result for SHA-256 f3d9a7330c28de4d…

MALICIOUS

PDF

83.0 KB Created: 2021-08-28 11:36:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: d85d98768ded220513f4907bb81b6ba8 SHA-1: 3787b8907aa7398c370cdb4e646112c6df5676f7 SHA-256: f3d9a7330c28de4d2f6bc90b64437069bf9f9df68fba563e12cca90b8deef85a
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to websites hosted on compromised Content Management Systems (CMS) or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution through these links. No scripts were extracted, and the document body was unreadable binary data.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://clinicamanila.com/ckfinder/userfiles/files/27074726003.pdf In PDF document text
    • https://alice-immo.com/userfiles/file/semisarireguwewiwuz.pdfIn PDF document text
    • https://www.jscorporation.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/1609a80ebb93ee---bodepunanosas.pdfIn PDF document text
    • https://mytutr.com/wp-content/plugins/super-forms/uploads/php/files/de2153d6aa1757419dc02ed8c7c1417c/ropedikibepagix.pdfIn PDF document text
    • https://berettyotv.hu/userfiles/files/16619801724.pdfIn PDF document text
    • https://burlingame.com/wysiwygfiles/file/bubuvagozekakajejukeja.pdfIn PDF document text
    • https://jetzterstrecht.hamburg/wp-content/plugins/super-forms/uploads/php/files/joiu8u95luffql89vsp9m7bbts/daxuvidusoduwomar.pdfIn PDF document text
    • https://segurosjdd.com/wp-content/plugins/super-forms/uploads/php/files/hj4jk2omudt3n48f7cuc26fvj4/63554137256.pdfIn PDF document text
    • http://alanurturizm.com/rsm/files/vevisipazisevifugovike.pdfIn PDF document text
    • http://dostrojar.sk/UserFiles/file/87157616043.pdfIn PDF document text
    • http://beta-rc.com/upload/files/bopazipegepimuso.pdfIn PDF document text
    • http://frankslawfirm.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/60927222501.pdfIn PDF document text
    • http://yatros.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160c63823af6b3---dukele.pdfIn PDF document text
    • http://barrarioservicos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b9dd3d82d65---radek.pdfIn PDF document text
    • https://www.hinogas.com/wp-content/plugins/super-forms/uploads/php/files/1fs9r6fmpg9an8nu6g2ejv5kjr/pibibexasetosusa.pdfIn PDF document text
    • http://moristas.com/userfiles/files/webegut.pdfIn PDF document text
    • http://scuderieverdina.it/scuderia/userfiles/file/3523514344.pdfIn PDF document text
    • http://wakingbeauty.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e07f3d930a9---36115148273.pdfIn PDF document text
    • https://nanyangtextile.com/userfiles/file/vovulekewubapubad.pdfIn PDF document text
    • http://studio-rivetti.it/userfiles/files/jofubovumegawapaziloxav.pdfIn PDF document text
    • http://sklepjola.pl/userfiles/file/dizaboramorimosupobonuw.pdfIn PDF document text
    • https://femagnet.com/upload/edu/article/file/gupojubonugewuxaj.pdfIn PDF document text
    • http://fkhd.cz/data/img/51566242669.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=how+to+remove+watermark+from+pdf+freewarePDF 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_off0000dcbb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCBB 10484 bytes
SHA-256: b4d51bbed14f2a9afec98937562ca3f2fdfdfe16dbabc6a5e74900284c063fb1
font_01_sfnt_off0000f498.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF498 19192 bytes
SHA-256: 9045fcab34d67ae5766e636f24528eedbfb7d55a46a2d61887918de68122dfbd
font_02_sfnt_off000124a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124A4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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