Malicious PDF — malware analysis report

Static analysis result for SHA-256 cc9d49a0711cf074…

MALICIOUS

PDF

101.6 KB Created: 2021-08-22 04:25:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: d35c47ec8635600fed35a4c94bddb7d8 SHA-1: e80aa4c3488e0800e5326c2a5e52584e0290f289 SHA-256: cc9d49a0711cf07436d94de78ab09d71f931866680fa16bb27a1e119ab3d9826
156 Risk Score

Malware Insights

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

The PDF contains a large number of external URIs and links, many pointing to PDF files hosted on various domains, indicating a link farm. The heuristic 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' and 'PDF_SEO_DISPOSABLE_LINK_FARM' suggest these links may be hosted on compromised sites or disposable domains. ClamAV detection as 'Pdf.Phishing.Trojan' further supports a malicious intent, likely for phishing or distributing further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9901

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://mszukam.pl/dat//file/puladizokuma.pdf In PDF document text
    • https://marblobathware.com/app/webroot/img/files/bovuwasenafokafoxefevo.pdfIn PDF document text
    • http://cageart.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16077ec2c353e7---vopuwitoboluxev.pdfIn PDF document text
    • http://119pump.net/d/files/31994989433.pdfIn PDF document text
    • https://www.ezhealthcheck.com/wp-content/plugins/super-forms/uploads/php/files/nihdm139ol34a3bua2bn05ut5d/zosekuwinidekevavexik.pdfIn PDF document text
    • http://lagostena.it/userfiles/files/junekafijepos.pdfIn PDF document text
    • http://pincailight.com/zk/UploadFile/file/2021061816494373499.pdfIn PDF document text
    • http://www.donboscovizag.org/images/files/24467389632.pdfIn PDF document text
    • http://aldara-latinoamerica.com/userfiles/file/xebebekivez.pdfIn PDF document text
    • https://digireg.org/upload/womirugudisabakenena.pdfIn PDF document text
    • https://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072dca552515---96501901430.pdfIn PDF document text
    • https://www.sodigital.it/wp-content/plugins/formcraft/file-upload/server/content/files/1609fb6d179a2a---polimefimarajit.pdfIn PDF document text
    • http://msslink.ru/userfiles/files/64491220549.pdfIn PDF document text
    • http://szkolaprywatnaleszno.pl/userfiles/file/nezodevojesebosaz.pdfIn PDF document text
    • https://aliencosmicexpo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b3f3a459887---terirepexibikovizasunatib.pdfIn PDF document text
    • http://bayzones.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/werofamibekevisaxuborene.pdfIn PDF document text
    • https://n95america.com/wp-content/plugins/super-forms/uploads/php/files/e538591d7700c9925ae8940420b7d1b9/japipuvigubutotepun.pdfIn PDF document text
    • https://www.cedicar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2042edbfaf---67022242261.pdfIn PDF document text
    • http://urparitet.ru/admin/ckfinder/userfiles/files/5481013815.pdfIn PDF document text
    • https://kantankacreative.com/wp-content/plugins/super-forms/uploads/php/files/71513c4351caf99ebb78590b35110e9c/wujutesogajedadapudubaxaz.pdfIn PDF document text
    • https://medgarlci.com/wp-content/plugins/super-forms/uploads/php/files/8551d3767328d95a076c2096e41f326d/jofapazegevuzu.pdfIn PDF document text
    • https://dixietemporarystorage.com/wp-content/plugins/super-forms/uploads/php/files/309bc05f17741a4a4e7bdb5b6d9d7e44/97739456462.pdfIn PDF document text
    • http://www.kickcommerce.com/userfiles/file/62488519166.pdfIn PDF document text
    • https://chocoinmobiliario.com/wp-content/plugins/super-forms/uploads/php/files/795c6f146a462ee8eb19ce2c87b7da76/24241206712.pdfIn PDF document text
    • https://pfgmm.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608e7cb5c62b7---pepaxovo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=mystery+gift+codes+pokemon+sword+december+2020PDF 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f78c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF78C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010fa3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FA3 11424 bytes
SHA-256: fdab53e7b5422560c68d590c9a686d199327b7279b8184ad1bc56922d2b43476
font_02_sfnt_off00012a4a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A4A 5868 bytes
SHA-256: 6e6cf457924428f47960885813b0290c7a4512d4219d6da5e3df5784448b45d8
font_03_sfnt_off00013fb7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13FB7 16160 bytes
SHA-256: 27fa49ca30b1f57c6e4f8b99ad1f73ead7010ce1f191e20d716503af09158f46
font_04_sfnt_off0001552c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1552C 17708 bytes
SHA-256: 482e3be2314e03d1f7612beef0525d7dc08c0b154cdb3abc45ce38624af81f8d

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