Malicious PDF — malware analysis report

Static analysis result for SHA-256 a67d613eb223f119…

MALICIOUS

PDF

70.8 KB Created: 2021-09-01 09:24:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: d61040a255d845ed26a181dd9dd09a2f SHA-1: 5ddd5982400f5b5f945402436d32bc967f5ffc5f SHA-256: a67d613eb223f119c58df99d65c42f75b11546772a4516240b01e7751563b3a2
156 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious. It contains numerous embedded URLs, many of which point to compromised CMS upload storage or are part of a link farm on disposable hosting. The primary function appears to be redirecting users to external sites, likely for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://diakmelo.hu/ckfinder/userfiles/files/wefero.pdf In PDF document text
    • http://dirpub.org/editor/ckfinder/userfiles/files/lutururexugukoputuf.pdfIn PDF document text
    • https://haisanquangninh.org/data/dulieu/files/38928785120.pdfIn PDF document text
    • https://drivingschoolofnorthtexas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c007755c2b---11295336883.pdfIn PDF document text
    • https://debo-fit.be/userfiles/file///58325830036.pdfIn PDF document text
    • http://www.orarestauratorisaf.it/wp-content/plugins/formcraft/file-upload/server/content/files/16114eb75d88e5---19933252599.pdfIn PDF document text
    • https://avis-medical.ma/wp-content/plugins/super-forms/uploads/php/files/3910d24cf645dd19bd6aea9e1d1068d6/fatasuzol.pdfIn PDF document text
    • http://rogalafamilyreunion.org/clients/0/0d/0db8e8e54aa701f14f52e26b989c21c2/File/nepiruzulefarudedovuma.pdfIn PDF document text
    • https://www.naabelectric.com/userfiles/files/82567630016.pdfIn PDF document text
    • http://vantaibactrungnam.vn/upload/files/tenebasuritonup.pdfIn PDF document text
    • https://betenenergy.com/sites/default/files/file/lidajowijuludirup.pdfIn PDF document text
    • https://fcr-fomentoconsumoerenda.com/uploads/files/xuvibuvagilafubopokuzik.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610c50bf58d23---zigabajuvok.pdfIn PDF document text
    • https://betonwerkendejonge.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160be22b86f838---zojepivanegobolimopot.pdfIn PDF document text
    • https://www.alongsideasia.com/wp-content/plugins/super-forms/uploads/php/files/99193ed1d3d887e56c849d452e70dc4a/62451970032.pdfIn PDF document text
    • http://yksskj.com/ckfinder/userfiles/files/68661023869.pdfIn PDF document text
    • http://krakowska98.com/zdjecia/fck/file/kagekobolujuval.pdfIn PDF document text
    • http://smeeing.com/userfiles/files/fojikarimetufobebamobug.pdfIn PDF document text
    • https://isabellepieman.com/userfiles/file/radev.pdfIn PDF document text
    • http://nitecoreromania.ro/files/file/nidefitupowif.pdfIn PDF document text
    • https://tailormade-sales-marketing.com/userfiles/file/17813560122.pdfIn PDF document text
    • http://1utilaje.ro/mm/file/60646091441.pdfIn PDF document text
    • https://krimgranit.ru/wp-content/plugins/super-forms/uploads/php/files/59788e194fd65021ec2168d2300fbf25/tugipomepi.pdfIn PDF document text
    • https://vigiweb.cl/dinamicos/files/file/30933124523.pdfIn PDF document text
    • http://omniatel.it/wp-content/plugins/formcraft/file-upload/server/content/files/160de4d6e10ca4---fogaborumututewekuj.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=photoshop+font+styles+downloadPDF 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_off0000b844.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB844 10604 bytes
SHA-256: d2eee1e4763a09d28c82dba427f5c4c0ac0082c10775b35076c04b0c263af0fe
font_01_sfnt_off0000d099.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD099 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e8ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8AB 14508 bytes
SHA-256: 81d1e0c51ff95048bb2e0794cdc5e5b47c1ac714dd3a9c43d0655dd03fc9ab33

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