Malicious PDF — malware analysis report

Static analysis result for SHA-256 ce082c9be81306bc…

MALICIOUS

PDF

85.1 KB Created: 2021-07-01 11:06:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: c2878cbd17cf110c264e504bb7872697 SHA-1: 43ec3b9878631f80d8c5a40e5ada3587d384ff7c SHA-256: ce082c9be81306bcefa74e79c79fdcf7d575e4dfa460ef858f9d3fce4fb66a98
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous links to external websites, many of which are hosted on compromised CMS platforms or appear to be part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the structure and URL patterns are consistent with malicious PDF lures.

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 http://www.gaviprintpack.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa50b93f778---jajoruwefokuvafuvij.pdf
    • http://alkanboya.com/files/file///18015419356.pdf
    • http://www.peplex.it/wp-content/plugins/formcraft/file-upload/server/content/files/160d932cd70b03---39643963520.pdf
    • http://christembassydocklands.org/wp-content/plugins/super-forms/uploads/php/files/7b14604b2bee6652689af4e863ee5774/11895471521.pdf
    • https://rclurie.com/wp-content/plugins/super-forms/uploads/php/files/6bd5c96b9efb7392664e7dd1820e370c/vajedulosojizukekivifuwox.pdf
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/o8cbepehs99019sf0ovpe5sv6m/73046834493.pdf
    • http://unipsyclinic.com/userfiles/file/20210524163256.pdf
    • http://pogservice.ru/userfiles/file/xarixabujime.pdf
    • http://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/160946a935113a---77517771639.pdf
    • https://www.alphaveneers.com/wp-content/plugins/super-forms/uploads/php/files/587936d3516c9a91be19eb354cdec0bf/wevonoli.pdf
    • http://uniondeautoescuelas.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079f9238e336---25544591515.pdf
    • http://sladkiy-ostrov.ru/userfiles/files/61966376179.pdf
    • https://luyenthitoeic.info/userfiles/file/86557298983.pdf
    • http://vimbark.sk/editor_uploads/files/nivasesuruvanadakaxo.pdf
    • https://fatheragneliti.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090c9d43b287---lijirevawamepe.pdf
    • http://www.unidacardoso.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b4c53cd1211---feparisegowusodirodader.pdf
    • http://ofitecnic.es/files.ofitecnic/fck_up/file/83964574995.pdf
    • http://taiwanglassgroup.cn/userfiles/file/60870914316.pdf
    • http://www.stratcareerservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160948f5fa2fc2---goniki.pdf
    • http://jhferry.com/data/fckeditor/file///51334558606.pdf
    • http://fantasypartyentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c5d49f1f248---rubuwuvebafomejurix.pdf
    • https://nscs.org/wp-content/plugins/super-forms/uploads/php/files/62247d3e389fce9b2477e0e9a3513cfb/wogaxolugina.pdf
    • http://oaklandscreche.ie/userfiles/files/komokugad.pdf
    • https://primax.fr/wp-content/plugins/super-forms/uploads/php/files/rkke1fbup8s83tihvv2crbo156/zibitumubamukobulezewika.pdf
    • http://www.sarajevo-inn-grunewald.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082cad7479bb---dapes.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=hickory+tree+leaves+in+spring
    • 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_off0000ea0b.bin
dacc120f7423bada0ca8e166675e959bfe7ee40cff12542db6352416d59232be
pdf-font-stream PDF embedded font (sfnt) at offset 0xEA0B 16824 bytes
font_01_sfnt_off000115ff.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x115FF 16792 bytes
font_02_sfnt_off00012e16.bin
4cd75595f6b399e22eeaa7fbf2c5d861684445b7770f06a6404699c4db45fa53
pdf-font-stream PDF embedded font (sfnt) at offset 0x12E16 10812 bytes