Malicious PDF — malware analysis report

Static analysis result for SHA-256 a9256ffabaee2b66…

MALICIOUS

PDF

129.2 KB Created: 2021-07-03 06:05:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 343e28c632fca784bfadb22128b4c0b5 SHA-1: c77aaffa4a6b3a79b1e4ec7f6d5a0fb1485174b9 SHA-256: a9256ffabaee2b6659154bde79105910ca875b7fbffbd16cf25dc6d3f6c50642
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised CMS upload directories, suggesting it's designed to redirect users to malicious content or phishing sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the link farm structure is a common tactic for initial compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9957

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://lawpropertyconsultants.co.uk/wp-content/plugins/super-forms/uploads/php/files/g4av217ddujan8aunn388m5i76/kaxuxipelojobonataxuf.pdf In PDF document text
    • https://prikolnaya.com/wp-content/plugins/super-forms/uploads/php/files/383f80d1c675ddff89240b2ecbf6d37e/52386787741.pdfIn PDF document text
    • https://www.syah.org/wp-content/plugins/super-forms/uploads/php/files/cf1ef602c5c847d4d68a09dec2a9bd37/64104667176.pdfIn PDF document text
    • http://allprintusa.com/admin/images/file/65068141194.pdfIn PDF document text
    • https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607f869d4d4b4---23702070888.pdfIn PDF document text
    • http://constructionone.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160ad4e3360546---34011506215.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/tlp63lpv28nf22pfk2o2iq7lo6/vekomejuporodijosonogenik.pdfIn PDF document text
    • http://geology.ie/wp-content/plugins/formcraft/file-upload/server/content/files/160b2937209641---xurinenode.pdfIn PDF document text
    • https://www.physioaktivkramer.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607150bf009ae---pasudipefotewad.pdfIn PDF document text
    • http://www.maarsehoveniers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a2af2db3d53---53452782476.pdfIn PDF document text
    • http://drinkandshrink.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608caeae9da0a---saxotisujajevasoja.pdfIn PDF document text
    • http://outspokenholland.com/userfiles/fckFile/20210519071728.pdfIn PDF document text
    • https://binarbaidfabrication.com/public_html/userfiles/file/purodejuwezuge.pdfIn PDF document text
    • https://digireg.cz/upload/kevutiv.pdfIn PDF document text
    • http://www.hotel-margherita.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d08018f3bca---34922893434.pdfIn PDF document text
    • https://angkorphotographyguide.com/userfiles/file/senapiko.pdfIn PDF document text
    • http://bagiez.com/userfiles/file/panibesomolajuwazewiri.pdfIn PDF document text
    • https://www.cittadelmiele.it/wp-content/plugins/super-forms/uploads/php/files/d121fa74bc52930adbd768526b939d24/xekofubifuguwa.pdfIn PDF document text
    • http://profisystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160c415fe8e240---laviparudojuvadikifojeri.pdfIn PDF document text
    • http://splogservice.ru/content/file/nabogexuji.pdfIn PDF document text
    • http://guides2alpes.fr/uploads/file/galowavigi.pdfIn PDF document text
    • https://www.isgs.org/wp-content/plugins/super-forms/uploads/php/files/be92cc9f63aad97cc8af47d8137b4651/jixudegavowowu.pdfIn PDF document text
    • http://movementlab.dk/userfiles/file/469515835.pdfIn PDF document text
    • http://gphs84.com/clients/866382/File/zegurimim.pdfIn PDF document text
    • https://tucsonhomewindowtint.com/wp-content/plugins/super-forms/uploads/php/files/f0fb819b9f783c3b68e625f3ed704ba9/14741191669.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=promotion+recommendation+mailPDF 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_off00019c63.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19C63 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001b475.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B475 16712 bytes
SHA-256: 12a0d6360e0a377d6cf177d9f2f2b6b15b67030c6873fdff3e2115379f8c5587
font_02_sfnt_off0001dfd2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1DFD2 10364 bytes
SHA-256: 817bf486b40bf1144dbdd4f7ad2fda3357157496224b1e1d59994a37a3e24f61