Malicious PDF — malware analysis report

Static analysis result for SHA-256 5581a3353bccd557…

MALICIOUS

PDF

82.5 KB Created: 2021-09-01 08:22:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 51cd004fff96759c8515aa6025700acd SHA-1: 763e3f3e9f8fee06985d48ad1c83ee5d9ed5d93b SHA-256: 5581a3353bccd557b2ebcad9f34073871102e262854d8a49776c984d3195544a
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple external URIs pointing to compromised WordPress sites, indicating an attempt to host malicious content. The 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' heuristics suggest the document's primary purpose is to redirect users to these compromised locations. The 'SE_CALLBACK_LURE' heuristic further suggests a phishing or scam pretext, likely to trick users into downloading further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 8

  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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.qbuildsoftware.com/wp-content/plugins/super-forms/uploads/php/files/f774f8a84852ddb17a7be5edb616bf01/sibepofejutifejaj.pdf In PDF document text
    • https://www.charityweiss.de/wp-content/plugins/formcraft/file-upload/server/content/files/16079eb066ef22---14067357277.pdfIn PDF document text
    • https://west-holding.com/userfiles/file/fenakisidirojebepewuse.pdfIn PDF document text
    • https://rjiminfra.com/wp-content/plugins/super-forms/uploads/php/files/83cf9e2a4cd7d6d81600d77fc02dfe31/zupemeru.pdfIn PDF document text
    • https://emergent-partners.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a55a4a56071---38785549074.pdfIn PDF document text
    • http://ciskmv.com/css/file/wejejubo.pdfIn PDF document text
    • https://diversified-nj.com/wp-content/plugins/super-forms/uploads/php/files/b558d1b93097694415de8bb1261a58af/85392290281.pdfIn PDF document text
    • http://ehomeforeclosure.org/images/file/35225119932.pdfIn PDF document text
    • http://www.studiolegalefusimorelli.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bfe2d673b4f---vozadazinaxab.pdfIn PDF document text
    • http://webinaris.biz/ckfinder/userfiles/publics/files/falobomevakenigavaxob.pdfIn PDF document text
    • http://55thocscompany.com/clients/62662/File/47365727793.pdfIn PDF document text
    • https://independentmusicleague.com/wp-content/plugins/super-forms/uploads/php/files/4b81f8b2b022c1c65d4e92b73021680c/bolavirubu.pdfIn PDF document text
    • http://www.absolutecateringla.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8f1c86c5ba---29468432415.pdfIn PDF document text
    • http://unipell.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160837a1895ae4---zuxowulunuzibifa.pdfIn PDF document text
    • http://cocoal.com/uploads/file/lakomibisuwuwesoloxape.pdfIn PDF document text
    • http://joelcsimonesq.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/varibofurawulidokewakedo.pdfIn PDF document text
    • http://studiogaleazzo.eu/userfiles/files/jigupixitoxaseferopu.pdfIn PDF document text
    • https://laetitiabernard.fr/images/file/10893415877.pdfIn PDF document text
    • http://santiagoporter.com/js/ckfinder/core/connector/php/files/matosawupujavaxezu.pdfIn PDF document text
    • https://uangraja.com/contents//files/lobalewo.pdfIn PDF document text
    • http://www.dnevi-sekretarjev.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160b1037660641---bunat.pdfIn PDF document text
    • https://kraftyz.in/ckfinder/userfiles/files/finegobeliwabenebivenevo.pdfIn PDF document text
    • https://biocoop.legreniervert.fr/ckfinder/userfiles/files/fagada.pdfIn PDF document text
    • http://ankaraeksioglu.com/resimler/files/98057968474.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=wyoming+cna+license+verificationPDF 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_off0000dde0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDE0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f5f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5F7 10852 bytes
SHA-256: a3aef15b3ad24a298142ea13450cbe545bfd0f7276f03031d1474a094c79dfbf
font_02_sfnt_off00010f12.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F12 17212 bytes
SHA-256: b7cb71728c792e51c2b4f8a17ea2e3ff53cf8d5390dea99173d0a9a5d7e71637

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