Malicious PDF — malware analysis report

Static analysis result for SHA-256 c1578497d2164802…

MALICIOUS

PDF

90.1 KB Created: 2021-08-04 07:34:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 0aedbfff7bb9a91d726aefdf461a669d SHA-1: 9e9642f7eafb6dc1fefe8ca4db6a2073c97a4756 SHA-256: c1578497d2164802c3a68a957efd3f59a9ea4af45ba09fcc44211b2425001453
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 domains that appear to be compromised or are used for hosting disposable files. Heuristics indicate this is a link farm, a common tactic for phishing or distributing further malware. ClamAV detection and ML classification strongly suggest malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9913

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://leadershipcareer.kr/fckeditor/_upload/file/29489705043.pdf In PDF document text
    • https://99shayari.in/userfiles/files/jivujemilobatekukif.pdfIn PDF document text
    • http://manpukuorder.com/uploads/files/vesunaruzogojazexopulo.pdfIn PDF document text
    • http://www.trimbleexpress.sk/wp-content/plugins/formcraft/file-upload/server/content/files/160c11eb6a52f5---fedetepelaxevubuk.pdfIn PDF document text
    • http://irmascaritasdejesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606f2c0401b7c---titirolajimasagowivuzepen.pdfIn PDF document text
    • https://lexconsulting.ro/webroot/files/media/jawunejabikavewojowa.pdfIn PDF document text
    • http://clair-environnement.eu/catalogue_dynamique/file/72792842703.pdfIn PDF document text
    • https://capecoralliving.com/media/file/26176376439.pdfIn PDF document text
    • https://aguiapromocional.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160939fe0bfb98---29601626975.pdfIn PDF document text
    • http://kuresi-kaitori.com/upload/content_pic/files/97129954433.pdfIn PDF document text
    • https://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/8371e85d1f6d0e763cb3ceb4796abf44/52279502206.pdfIn PDF document text
    • http://abwsalisbury.com/uploads/files/94535489038.pdfIn PDF document text
    • http://www.luminicaambiental.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2299c06726---pabipupugamelugirin.pdfIn PDF document text
    • https://widepolymers.com/userfiles/file/fozilipa.pdfIn PDF document text
    • https://vernadoc.com/wp-content/plugins/super-forms/uploads/php/files/e58f4255d40b34d19ba2690f88c8c78b/51416097157.pdfIn PDF document text
    • http://bycongroup.com/UserFiles/file/85222494127.pdfIn PDF document text
    • http://www.caribbeandentist.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d862b15a33---waluxegenutaben.pdfIn PDF document text
    • http://www.klpreschool.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c87da69196---zufoxezoboxuxidunewupo.pdfIn PDF document text
    • https://rffsev.ru/wp-content/plugins/super-forms/uploads/php/files/630d10ee555acaaaabdf2aff83675aad/lofij.pdfIn PDF document text
    • http://savalis.ru/userfiles/file/zosatoluxefuva.pdfIn PDF document text
    • https://heykidsletscook.info/wp-content/plugins/super-forms/uploads/php/files/072eeab7072e100b6b8c8d3d47c46b12/44493085446.pdfIn PDF document text
    • https://lawyerupsmart.com/tempimg/file/6055066075.pdfIn PDF document text
    • http://rurisnet.org/images/file/47208494051.pdfIn PDF document text
    • https://www.vibrationmonitoring.asia/wp-content/plugins/formcraft/file-upload/server/content/files/160a5877831801---mibutenozavevuta.pdfIn PDF document text
    • https://enville.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d3a877286b3---vesaronototi.pdfIn PDF document text
    • https://www.enviedecrire.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a14f63080f3---60038308085.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=best+android+emulator+for+windows+10+2019PDF 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_off0000fb08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB08 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001131f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1131F 11216 bytes
SHA-256: 9510598a328b599d515c5d77ba86547b632d91fa9f15c6861032d9974fd74c03
font_02_sfnt_off00012d8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D8D 17464 bytes
SHA-256: 55f0726c9df55e1b558e3b36b28e92b7020b29844563e61bee1dae94004c0f2e