Malicious PDF — malware analysis report

Static analysis result for SHA-256 c49923d763739f90…

MALICIOUS

PDF

78.4 KB Created: 2021-09-04 10:27:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 67327e13b1112de09ee0fa4f42b36a30 SHA-1: aa3e2e88de29ff8e8f1280abefd19b9219e7275b SHA-256: c49923d763739f905030e4aca59165269f6c867a70e737ae64fe6baddff0b8d9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to compromised WordPress sites, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, specifically identified as a phishing trojan. While no scripts were directly extracted, the nature of the embedded URLs and the heuristic firings point towards a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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 https://crewmak.ru/uplcv?utm_term=hifonics+colossus+xi+pdf PDF link annotation
    • https://genesisbehaviorcenter.com/wp-content/plugins/super-forms/uploads/php/files/ffff50b3519b0a7ba7e74d551a1d2a3d/8550371897.pdfIn PDF document text
    • https://stallion-international.com/userfiles/file/wolorawuxisujonamewabojar.pdfIn PDF document text
    • https://antoinepanau.com/wp-content/plugins/super-forms/uploads/php/files/91f8c8b57d323f7cbc2c815431fee4ac/19828878190.pdfIn PDF document text
    • http://phuongdonggolf.vn/app/webroot/uploads/files/19173495273.pdfIn PDF document text
    • https://www.mysmilestudios.com/wp-content/plugins/super-forms/uploads/php/files/31d2e082efac860ec32ac84698bc53c0/51854062197.pdfIn PDF document text
    • http://neurooperations.com/ckfinder/userfiles/files/2932605179.pdfIn PDF document text
    • http://bestforfishing.com/wp-content/plugins/super-forms/uploads/php/files/cea9f1f3b68f70e4d5e7ab3c31d60e2d/70985091047.pdfIn PDF document text
    • https://next-engineering.com/userfiles/files/60659752040.pdfIn PDF document text
    • http://metaglas.kr/userData/board/file/zujubefepijejafarovaduxe.pdfIn PDF document text
    • http://www.pianoszimmermann.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606d2740a7eb1---24978064123.pdfIn PDF document text
    • http://cana.vn/uploads/userfiles/file/linopipapomitutumilikop.pdfIn PDF document text
    • http://www.pranabkumar.com/fckimages/file/jivos.pdfIn PDF document text
    • http://dahchen.tw/userfiles/files/keramed.pdfIn PDF document text
    • https://ozanetiket.com/TasarimAcarnet/serhali/upload/files/tivene.pdfIn PDF document text
    • https://www.sacproblemleri.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079b992bc8d6---vadixidakupidukerumodob.pdfIn PDF document text
    • https://jiu-hang.com/upfiles/editor/files/zitumugobedepefage.pdfIn PDF document text
    • http://ficfart.org/userfiles/file/91228104180.pdfIn PDF document text
    • http://xn----itbbfrdrdbd4bgy6gi.xn--p1ai/webroot/files/files/42425123410.pdfIn PDF document text
    • https://olgapopovaphoto.com/wp-content/plugins/super-forms/uploads/php/files/597c2f5271d1cf28148e02ab27d6f572/wanepipebikajuk.pdfIn PDF document text
    • https://too.kg/wp-content/plugins/super-forms/uploads/php/files/da86c612aea2ac0e89dcdbf6b3366d03/xisonixodafavorola.pdfIn PDF document text
    • https://schreinerheusi.de/wp-content/plugins/formcraft/file-upload/server/content/files/16086f8bdb4947---zuvanupikidilap.pdfIn PDF document text
    • https://www.lokalesichtbarkeit.de/wp-content/plugins/super-forms/uploads/php/files/emr78h32rps0orisvdvjsfm157/lanutafa.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_off0000ccc6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCC6 10316 bytes
SHA-256: abc7b2c62efcd3e5e93ef1ded4613a98400518c41c517139f01ff51c55917763
font_01_sfnt_off0000e40a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE40A 18500 bytes
SHA-256: 4ad97b89f6e23ac0b8e33ca2c39c92e31e4d610e242b5196527821988f14de37
font_02_sfnt_off0001147f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1147F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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