Malicious PDF — malware analysis report

Static analysis result for SHA-256 9956e7cd7e90b08f…

MALICIOUS

PDF

84.2 KB Created: 2021-08-18 07:23:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: d5998796b0eb5612cab4710431012f94 SHA-1: 8977027e8b75761d39c9f966230534902d58b94e SHA-256: 9956e7cd7e90b08fb3a307ec027ab4932d2f94e0d3d7184916312effea20f178
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript, which is a common technique for executing malicious code. It also features a link farm pointing to compromised WordPress upload directories, suggesting an attempt to host and distribute malicious files. The ClamAV detection and ML classifier further support its malicious nature, likely as a phishing or malware delivery mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9944

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://www.penyembuhanholistikreiki.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611946213b296---14535094712.pdf In PDF document text
    • https://canvasations.com/wp-content/plugins/super-forms/uploads/php/files/9of3vta1ocs7kc5dbfa28boau0/dekib.pdfIn PDF document text
    • http://bjerkelunden.org/content/files/userfiles/file///73212846680.pdfIn PDF document text
    • http://gsmontaggi.it/userfiles/files/mepewilamow.pdfIn PDF document text
    • http://pulsrmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160852ca3dbe34---vegesu.pdfIn PDF document text
    • http://batistar.fr/userfiles/file/58265687465.pdfIn PDF document text
    • http://vdgairconditioning.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160f9e5266ecd6---wulaw.pdfIn PDF document text
    • https://kantankacreative.com/wp-content/plugins/super-forms/uploads/php/files/d55c88461415812d61f51592d7a5e858/40120769174.pdfIn PDF document text
    • http://www.insurancedirectcanada.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607bed3c933bf---fukaforemaluwakotevixudi.pdfIn PDF document text
    • http://adhdadvisory.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608164246e514---24453959097.pdfIn PDF document text
    • http://www.taylormadetc.com/siteadmin/ckfinder/userfiles/files/78955279926.pdfIn PDF document text
    • https://lengthening-sldf.com/userfiles/file/wokot.pdfIn PDF document text
    • http://asckhn.com/acskhn/userfiles/file/nipega.pdfIn PDF document text
    • http://baohanhranghm.com/upload/img/files/94225005677.pdfIn PDF document text
    • http://speckrepeg.by/UserFiles/files/17956649810.pdfIn PDF document text
    • http://qianlong99.org/ckfinder/userfiles/files/vopejexawuzapurene.pdfIn PDF document text
    • https://bancodevida.com/bancodevida/admin/images/image/file/guzenerizo.pdfIn PDF document text
    • http://kurumakaitori-one.com/js/upload/files/gatozufa.pdfIn PDF document text
    • https://agilitynd.com/wp-content/plugins/super-forms/uploads/php/files/ef59ebf654a6bc68ba42dbb0ccf4db9e/wigixonefisukogukadaf.pdfIn PDF document text
    • http://lifemartrealestateconnect.com/wp-content/plugins/super-forms/uploads/php/files/hv21bbvad8clt8frbfg56m2tt3/34476560633.pdfIn PDF document text
    • https://virker-ikke.dk/files/14004097686.pdfIn PDF document text
    • http://ecompletecontact.com/ckfinder/userfiles/files/jabivorovufegi.pdfIn PDF document text
    • http://geoodwierty.pl/files/file/27382552671.pdfIn PDF document text
    • http://www.mondzorgvesa-voorschoten.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c3c4b82f7e5---12823695289.pdfIn PDF document text
    • https://elmawadah.com/userfiles/file/pozoxinexex.pdfIn PDF document text
    • https://dichvuketoansg.com/luutru/files/kulipu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=comment+fusionner+deux+pdf+windows+10PDF 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_off0000e2c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2C2 10944 bytes
SHA-256: af34a03c44f1695e12c477eecd1a0bfd929d18a9bce8e0f07bade088ac334bef
font_01_sfnt_off0000fc39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC39 17840 bytes
SHA-256: 627372d408f783cbd21239032440fe7fa979bddc49c22e0bcac974a4288cfdcd
font_02_sfnt_off0001288b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1288B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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