Malicious PDF — malware analysis report

Static analysis result for SHA-256 be0bc75f68d4f90a…

MALICIOUS

PDF

82.1 KB Created: 2021-09-03 07:06:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: 9a9fb0327d0de37f43bf45a6385243d8 SHA-1: 73c7f6706a153f3d3506e7b0c89f51ac39aefb35 SHA-256: be0bc75f68d4f90ac057241d65ad3a79fde9c93b1b1b5b14a0dc6f58d1e023c0
156 Risk Score

Malware Insights

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

The PDF contains a link farm directing to multiple external websites, many hosted on compromised CMS platforms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://nemeckystrakac.sk/editor_uploads/files/jumisogulokusev.pdf In PDF document text
    • https://lorenzonimmigrationlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/161250878d6f50---63760802341.pdfIn PDF document text
    • https://travelsafeway.com/userfiles/file/jozudelakad.pdfIn PDF document text
    • https://tuabogadoangel.com/wp-content/plugins/super-forms/uploads/php/files/f254bb4ac10268fd2f75aeda295468a7/soguvidegepegim.pdfIn PDF document text
    • https://vinadesigndanang.vn/uploads/image/files/64216260061.pdfIn PDF document text
    • https://www.marbelitesa.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1607b826655489---vudefaxefidetuxopu.pdfIn PDF document text
    • http://archidaldegan.eu/userfiles/files/56900952122.pdfIn PDF document text
    • http://planet-for-events.de/userfiles/file/lizizuzuzisuvuxagikupi.pdfIn PDF document text
    • http://parmalab.it/userfiles/files/44864897381.pdfIn PDF document text
    • https://buddingheights.org/wp-content/plugins/formcraft/file-upload/server/content/files/16070c3cbdd7f1---vizutukulasaduwiga.pdfIn PDF document text
    • https://kaemsp.org/upload/editor/file/89241089638.pdfIn PDF document text
    • http://saharun.org/uploads/ckfinder/userfiles/files/6671330961.pdfIn PDF document text
    • http://bobas24.pl/Upload/file/20921482943.pdfIn PDF document text
    • https://shinyjewellers.com/wp-content/plugins/super-forms/uploads/php/files/8natl1aa73b4sfqj2tkh85n2v1/wewudov.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/e4af56d8f80d77fa0969a0789600bd0e/vazipo.pdfIn PDF document text
    • https://apoc.com.au/wp-content/plugins/super-forms/uploads/php/files/072ff66e0084fccc761425aba65f7522/26719805258.pdfIn PDF document text
    • http://veronikavilla.hu/userfiles/file/fivezozawozosulawes.pdfIn PDF document text
    • http://tydafa.com/dafa/uploadfiles/20210627044434.pdfIn PDF document text
    • http://pebyte.com/wp-content/plugins/super-forms/uploads/php/files/acfihhsri9auhnvi9s3p24utsn/57085950639.pdfIn PDF document text
    • https://rescue.bg/wp-content/plugins/formcraft/file-upload/server/content/files/16073fc4679d31---98693141384.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/1612d566e6c1e9---peludimagojer.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=patrick+o%27brian+post+captain+pdfPDF 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_off0000db43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB43 18064 bytes
SHA-256: 3057d8cac4ad5974293f1651928387435cf28534be558d911bf4a742251255f8
font_01_sfnt_off00010a5c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A5C 10700 bytes
SHA-256: 36f057c7d6a8e9af2f6d8184d5c0f4a25611b7299a66d590edaf9cd1feb97528
font_02_sfnt_off000122e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122E3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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