Malicious PDF — malware analysis report

Static analysis result for SHA-256 c2a5674b40ab3134…

MALICIOUS

PDF

86.7 KB Created: 2021-07-07 06:16:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 3623411f709b5f675416733dd8ccc061 SHA-1: 69043505e2bb88ff09bf3cbd52ede65668e4f5c7 SHA-256: c2a5674b40ab31343cf8ba81ce61f5f062c8e85663182cbf3490a96ad5236900
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier indicating a high probability of maliciousness. The heuristics indicate the PDF functions as a link farm, with many URLs pointing to compromised CMS upload directories. These links likely serve as lures for phishing attacks or to distribute further malware. The presence of numerous links on disposable hosting further supports a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://arcenevents.nl/site/upload/files/60825855988.pdf In PDF document text
    • http://leadershipcareer.kr/fckeditor/_upload/file/sodumabetupe.pdfIn PDF document text
    • http://arredamenticucinesiciliane.it/userfiles/files/48384076149.pdfIn PDF document text
    • http://szao-spb.ru/images/news/file/poromizaxej.pdfIn PDF document text
    • http://kwik-it.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16085d49c1031c---dakojajuvelepisifinepogo.pdfIn PDF document text
    • http://www.jcca.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/1607c09b1b1ec0---17644371726.pdfIn PDF document text
    • http://coinproject.com/userfiles/image/file/55345344843.pdfIn PDF document text
    • http://jnnycc.org/userfiles/file/57215249458.pdfIn PDF document text
    • http://jtour.vn/userfiles/file/pagabu.pdfIn PDF document text
    • http://www.fullertherapy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f82ecefbdf---65865994550.pdfIn PDF document text
    • http://rocincorporated.com/domain.com/images/dynamic_pages/file/lozapisodiselegol.pdfIn PDF document text
    • http://www.atrium-tuiles.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aeb42d66bc3---powovotavamuraveri.pdfIn PDF document text
    • http://www.blueoak.fr/image/file/piwejibubalusonurevugas.pdfIn PDF document text
    • https://navliecky.net/userfiles/file/xexenuja.pdfIn PDF document text
    • http://cestovni-postylka.eu/userfiles/file/pulakakodetamizaretawi.pdfIn PDF document text
    • http://sl-light.ru/design/img/upload/file/wuseduxamexadexetotixu.pdfIn PDF document text
    • http://www.molinoag.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c2e121ce4d---sizazelatageboburesa.pdfIn PDF document text
    • http://www.wallisandemmanuel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092d5e410b41---sobimatemumivuwebajoxax.pdfIn PDF document text
    • https://www.davidcosz.de/wp-content/plugins/super-forms/uploads/php/files/8s5fqhb33eckomuat7gkdg7v2d/34241570631.pdfIn PDF document text
    • https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/af34cc879d082b46dad3884e9fd48b20/44561678388.pdfIn PDF document text
    • https://encouragingmath.com/wp-content/plugins/super-forms/uploads/php/files/d550a266824efcb2c501ac4403d34051/jonugonifirudatafiwosesev.pdfIn PDF document text
    • https://gccpay.net/wp-content/plugins/super-forms/uploads/php/files/15d1041d68402503a215854962521832/92712608708.pdfIn PDF document text
    • https://staffxrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/d593c812f35fe47579c73ae8ce949121/5500328913.pdfIn PDF document text
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/f31ouo2b2aig7m6fr9f026b260/zuzib.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=job+interview+engineering+questions+and+answersPDF 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_off0000f15e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF15E 16568 bytes
SHA-256: 0902d6c59df96a8f0d42da98ef1c3a6d0b00a98a1917b600605b063905a47efe
font_01_sfnt_off00011c15.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C15 10908 bytes
SHA-256: fca6d4dcefe53b4318b67de7542cd0ee72667fe5ba3231fd87972ca2c2120823
font_02_sfnt_off00013509.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13509 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1