Malicious PDF — malware analysis report

Static analysis result for SHA-256 009bcb01c1bcc640…

MALICIOUS

PDF

84.7 KB Created: 2021-06-30 09:44:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: acee5a27d540b9789aa29155d105bf28 SHA-1: 970b1760e37c83965115b5f570d94c8770e16d11 SHA-256: 009bcb01c1bcc640c4c648471d9ba7391ffa2e0acde164af66f546663f129d7a
164 Risk Score

Malware Insights

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

This PDF document is classified as malicious by ML models and ClamAV, indicating it is a phishing or trojan delivery mechanism. It contains a link farm pointing to numerous URLs, many hosted on compromised WordPress sites and disposable domains, suggesting an attempt to obscure the true malicious destination. The presence of a 'download' button lure further supports the phishing pretext, aiming to trick users into downloading a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://krisoc.ru/uplcv?utm_term=free+download+of+ebook+in+pdf+format PDF link annotation
    • http://anthonyvienna.com/sites/default/files/file/waxejaku.pdfIn PDF document text
    • https://www.kiteschule-eckernfoerde.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606f5b8f7e45b---dulukoxamaxirapu.pdfIn PDF document text
    • https://lightspec.com/wp-content/plugins/super-forms/uploads/php/files/76bb6330839dc5babfef4b0491cc23a8/kexawugavuzise.pdfIn PDF document text
    • https://samtee.com/admin/images/file/976535141.pdfIn PDF document text
    • http://inewbus.com/wp-content/plugins/super-forms/uploads/php/files/se7ha2su3fvkapf067vplri9j0/1696989094.pdfIn PDF document text
    • http://www.bestlifepolicy.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1606cb7e9ed8b2---zabizumavasosogijusadut.pdfIn PDF document text
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c978439b45---61345150727.pdfIn PDF document text
    • http://kahounova.cz/userfiles/file/jetiditasij.pdfIn PDF document text
    • https://agentcctv.com/userfiles/file/fovuturawedopeso.pdfIn PDF document text
    • https://bancodevida.com/bancodevida/admin/images/image/file/tetexagasesuj.pdfIn PDF document text
    • https://dcmheavyequipment.com/admin/images/file/62427160608.pdfIn PDF document text
    • https://vernadoc.com/wp-content/plugins/super-forms/uploads/php/files/dc1189bd4ea3bd48ef87d521fceeecab/51939347678.pdfIn PDF document text
    • http://aucoindeshalles.com/menu/file/72692066339.pdfIn PDF document text
    • https://myphi.biz/nbloom/fckuploads/file/57314951566.pdfIn PDF document text
    • https://seerupit.dk/assens/file/vudaduginobibiwupitokaxos.pdfIn PDF document text
    • http://ahs1978hounds.com/clients/0/09/09313dc2b2b2138818c22350edca9cf7/File/63497036103.pdfIn PDF document text
    • http://xn--22c6buakeib3ax0bzcc5b8tlc.com/userfiles/file/22599149892.pdfIn PDF document text
    • http://andlupa.com/userfiles/file/72753167004.pdfIn PDF document text
    • https://fnb-concepts.com/images/uploads/files/mepomeligabewedexama.pdfIn PDF document text
    • http://edgecs.net/documents/gaporifaxokikikisi.pdfIn PDF document text
    • https://ayurvedaemart.com/uploads/file/67539984781.pdfIn PDF document text
    • http://www.zywawiara.pl/pliki/91232696424.pdfIn PDF document text
    • https://www.carlosfunes.es/wp-content/plugins/formcraft/file-upload/server/content/files/160b0a487131d0---kebomawozepepesuzufoma.pdfIn PDF document text
    • http://www.next-conseil.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160bd10bd28ab5---varizi.pdfIn PDF document text
    • http://www.colegiometa.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/160a37398ed7a2---fanukotiwonixukudubir.pdfIn PDF document text
    • https://primewestelectrical.com/wp-content/plugins/super-forms/uploads/php/files/f915a74fefe75e678aba5ccac2058e22/tapojosugasutalapemebizog.pdfIn PDF document text
    • http://goksirlambinowice.pl/img/upload/files/wuxulazakava.pdfIn PDF document text
    • http://lovewhereyoulv.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/68a3e843dd57b90d0378ce9fc1717409/98686370874.pdfIn PDF document text
    • 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_off0000e8da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8DA 16668 bytes
SHA-256: f496c590eea5d7e9b94ad1ed2cfecea6f1678e4c8990b8122b5199a4403f35e8
font_01_sfnt_off0001145f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1145F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012c76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C76 10788 bytes
SHA-256: e07d38ad001aff6da188d734e859319fe5f367797a2c43b351528d9c1e5378c7

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