Malicious PDF — malware analysis report

Static analysis result for SHA-256 e26803445dab7c91…

MALICIOUS

PDF

88.9 KB Created: 2021-07-01 16:18:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: b3c1d8614fac01cd791d6fe2115de8d5 SHA-1: 3bd4cd82e82930819692bd5573ff7bc92405e272 SHA-256: e26803445dab7c91412d8bed1e8b03f236835bdc7f3d10634fceecbdf28f4190
156 Risk Score

Malware Insights

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

The sample is identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It contains numerous links pointing to compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content. The PDF structure and the presence of external URIs indicate an attempt to exploit vulnerabilities or trick users into downloading further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://www.projectorrentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075a89c09d71---gemoji.pdf In PDF document text
    • https://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/a7cf54e6488c00131edb5fa17a345641/zokadusafiwebifomegekaxu.pdfIn PDF document text
    • https://expeditions-travel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607019deb71b5---kixafiwok.pdfIn PDF document text
    • https://jodhpurtravels.com/nbloom/fckuploads/file/guvegu.pdfIn PDF document text
    • http://jejuecotech.com/ckupload/files/37743579463.pdfIn PDF document text
    • https://sarujiovalente.com/wp-content/plugins/super-forms/uploads/php/files/90g37btsve2b94umtsqqvi8isu/tabarazupalamagejob.pdfIn PDF document text
    • https://cls-toronto.com/wp-content/plugins/super-forms/uploads/php/files/5e646f3883744e99ff32b946b62b8180/16608986140.pdfIn PDF document text
    • http://autoshiftbid.com/fckeditor/userfiles/file/56232273131.pdfIn PDF document text
    • https://al-wesam.com/userfiles/files/mizomuzurew.pdfIn PDF document text
    • https://slaterlighting.com/wp-content/plugins/super-forms/uploads/php/files/c8508e53000c23d73684d386ab15b27b/wunowawufejozajovi.pdfIn PDF document text
    • http://www.gradur.ba/wp-content/plugins/formcraft/file-upload/server/content/files/16094d23e148a4---9803999918.pdfIn PDF document text
    • http://asdgolfclubtoscana.com/writable/public/userfiles/file/bilukomadiluzij.pdfIn PDF document text
    • http://countrysquirefoods.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b9521a6e525---16226444643.pdfIn PDF document text
    • https://barrierball.cl/ckfinder/userfiles/files/tusejufegozibunulojirar.pdfIn PDF document text
    • http://nnk.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1609aaf9672acf---19515234319.pdfIn PDF document text
    • https://baodinhsolar.com/wp-content/plugins/super-forms/uploads/php/files/vrpfigba3gfho14qvlufldhcj1/gedeko.pdfIn PDF document text
    • https://salubrismd.com/wp-content/plugins/super-forms/uploads/php/files/f681ab3f50e884808a676d910cb04797/tedeletojojul.pdfIn PDF document text
    • https://southernlightingsource.com/wp-content/plugins/super-forms/uploads/php/files/cb8006d843569a2520f520ba016e3618/25618915291.pdfIn PDF document text
    • https://aquatrustfina.com/userfiles/file/91368869729.pdfIn PDF document text
    • http://kutyasturak.hu/images/files/11719523078.pdfIn PDF document text
    • https://fellowpeo.com/wp-content/plugins/super-forms/uploads/php/files/2d42da0fc960f3ca126a1d65b6f7f1de/93774178047.pdfIn PDF document text
    • http://bbfederico2.net/userfiles/file/dixovikuzivevala.pdfIn PDF document text
    • http://www.suffaheducation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b368dccf33---50267496396.pdfIn PDF document text
    • https://brokenspoke.com/wp-content/plugins/super-forms/uploads/php/files/492d928d692be0eb04e4433adba000f3/3103607268.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=you+were+never+really+herePDF 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_off0000f89f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF89F 17928 bytes
SHA-256: 2dd445df2472c19fe8326c1f04cad195f7fb2963967a105389e80b9e0c908146
font_01_sfnt_off00012780.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12780 10196 bytes
SHA-256: 7e766187023f9fa30d846cd5147b1c86266d7514b99787a18f7f7125b6074b23
font_02_sfnt_off00013e53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E53 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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