Malicious PDF — malware analysis report

Static analysis result for SHA-256 1f5be6e4bbc9a12f…

MALICIOUS

PDF

71.3 KB Created: 2021-09-27 16:51:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 68213ce0076ec447e7cda2acb5922b87 SHA-1: 0ddafb214d09264bccba3480c168f43c1ef977f1 SHA-256: 1f5be6e4bbc9a12f0bd4db5d39179ca655774bf89817e4e3fea807947cb1d4e5
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://crysiq.ru/uplcv?utm_term=equalizer+and+bass+booster+apk
    • https://rrrc.us/userfiles/file/36484071713.pdf
    • https://watosaphotography.com/app/webroot/userfiles/files/20210915_165236.pdf
    • https://austdoorcaocap.com/upload/files/sufesajekedofelipafibi.pdf
    • https://oancora.com/ckfinder/files/nedawuxinulofuvak.pdf
    • http://es-umzuege-transporte.de/wp-content/plugins/super-forms/uploads/php/files/3f8f01e8cbb480479ece1e376621011d/19522664279.pdf
    • http://zkqzl.com/uploadfile/file///2021092600091523.pdf
    • https://hotelristorantenovecento.it/wp-content/plugins/super-forms/uploads/php/files/ea0c1f98dd47189e2b22f0215468cffd/xowufutaxosuwib.pdf
    • http://coimbra.hu/uploads/ckfinder/userfiles/files/luzilor.pdf
    • http://misterholidaysanprisco.it/userfiles/files/56548609816.pdf
    • http://louisamerino.com/userfiles/file/18900846951.pdf
    • http://beiks.info/public/file/23177772180.pdf
    • https://groupunsur1.com/contents/files/risipudajen.pdf
    • https://kingwrapcarspa.com/upload/files/lixikixuvixegaputinoviki.pdf
    • http://sevgineslianaokulu.com/ckfinder/core/connector/php/uploads/files/78449528838.pdf
    • https://duhocblueocean.vn/ckfinder/userfiles/files/89131647805.pdf
    • https://keralatemples.info/ckfinder/userfiles/files/titujuv.pdf
    • https://dondepodemosir.com/userfiles/file/seviwuzujujanafisagaf.pdf
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/0ec7082473eeac8379ebb0732bc8a0c8/28546832357.pdf
    • https://samsungdvmklima.com/upload/ckfinder/files/xaroxu.pdf
    • http://siddharpeedam.org/userfiles/file/
    • https://valserve.in/web/k/main_admin/ckfinder/userfiles/files/59216408532.pdf
    • http://bacsiha.com/public/ckfinder/userfiles/files/83196517521.pdf
    • http://safiorida.nl/operatori/userfiles/file/28847360227.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b088.bin
4e8836303efd0643e0af0e5816aebf0d07a8e991ed71d223147206b127f74d67
pdf-font-stream PDF embedded font (sfnt) at offset 0xB088 18660 bytes
font_01_sfnt_off0000deb4.bin
a13be54dd7f63f9bf68009448f141f9fbfac7e473930f530613b197ee276511b
pdf-font-stream PDF embedded font (sfnt) at offset 0xDEB4 10904 bytes
font_02_sfnt_off0000f7a0.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF7A0 16792 bytes