Malicious PDF — malware analysis report

Static analysis result for SHA-256 75cbc0c31a777467…

MALICIOUS

PDF

89.9 KB Created: 2021-09-06 08:51:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 1e7231e8bea42c61e870ba1b5d52a182 SHA-1: e16ab311d67d7d670e00a8e6f4d43144a92122d3 SHA-256: 75cbc0c31a777467f6d9bfb78a8c1bdc30c2d62d14f5f7097c9ab916ceb46374
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links, many pointing to compromised WordPress sites, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent. The presence of multiple external URIs and link farm heuristics confirms the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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.reroofingbrisbaneqld.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a0a080bdb83---40611655866.pdf In PDF document text
    • https://etcbt.com/userfiles/file/88874891964.pdfIn PDF document text
    • http://tbff-bygg.se/img/files/66536783030.pdfIn PDF document text
    • https://dycmc.com/DATA/upload/files/202106230221416692.pdfIn PDF document text
    • http://www.dadosefatos.net.br/wp-content/plugins/formcraft/file-upload/server/content/files/160703816c57d1---bovavejaromexafisasote.pdfIn PDF document text
    • http://brandnewgoods.net/userfiles/file/mifexukibimadomelokod.pdfIn PDF document text
    • https://www.comperat-89.fr/ckfinder/userfiles/files/89570711210.pdfIn PDF document text
    • http://ytovietnam.net/ckfinder/userfiles/files/tixirufot.pdfIn PDF document text
    • https://www.ltgpartners.com/wp-content/plugins/super-forms/uploads/php/files/a796f998e0eb2e039e8b265adaeecb14/befusodubuwaxel.pdfIn PDF document text
    • https://www.lloydsunder30s.com/ckfinder/userfiles/files/fenosafi.pdfIn PDF document text
    • http://benrassam.com/uploads/files/luzipogesusepaxiruz.pdfIn PDF document text
    • https://www.mtiwelding.co.uk/admin/ckfinder/userfiles/files/kidosiwisuloguvopuvino.pdfIn PDF document text
    • http://nokianhakkablue.ru/ckfinder/userfiles/files/71520704859.pdfIn PDF document text
    • https://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f375fb3d91---96415307762.pdfIn PDF document text
    • http://fincasotilloviejo.es/files/sotillo/_repo/file/98671608977.pdfIn PDF document text
    • https://www.horisunmauritius.com/wp-content/plugins/super-forms/uploads/php/files/e8d66009c0a50446ae3f6024e064ac0a/30129215275.pdfIn PDF document text
    • https://www.blondel-bois.fr/ckfinder/userfiles/files/jiniworagepapijojabib.pdfIn PDF document text
    • http://pcccphucvinh.com/upload/files/faxut.pdfIn PDF document text
    • https://hightechrustremovers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607aab8c617bf---88369565639.pdfIn PDF document text
    • https://wlao.on.ca/wp-content/plugins/super-forms/uploads/php/files/6f1fb7e82643536db42293a481dd2f6c/83587335607.pdfIn PDF document text
    • https://lorenzonimmigrationlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c539800c1cd---jokipofase.pdfIn PDF document text
    • http://samurairamenbar.com/uploads/files/62714361534.pdfIn PDF document text
    • http://www.esthemed.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160985b2db94f7---14617090030.pdfIn PDF document text
    • http://aiken7050.com/clients/5/51/510ae66c864a6d23552e02d1b5190e2c/File/fumepagapakafov.pdfIn PDF document text
    • http://www.fotografoeventimilano.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083c1e408c46---61935186949.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=gold%27s+gym+450+treadmill+user+manualPDF 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_off0000f996.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF996 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000111a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111A8 17788 bytes
SHA-256: 6c81fed87037c0e075030a4c5b08d0b9d1e2ae4086b4bc296f0472e7125b2b1c
font_02_sfnt_off00013fb9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13FB9 11212 bytes
SHA-256: a292f4063a73b4cb8db034d76fa1ef273d534625ae9fcfc954d807ec241bb539