Malicious PDF — malware analysis report

Static analysis result for SHA-256 ebfbb52d6380f8f3…

MALICIOUS

PDF

86.8 KB Created: 2021-07-25 14:02:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 7de57913c7d7ff1b2336cb8d8332c313 SHA-1: b640295cb08e74d831b6dc23283ffdc49afc1f88 SHA-256: ebfbb52d6380f8f341d04a493d7724d17c8b6a79a5baf40f941859d3da9c0d57
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file is identified as malicious by ML classifiers and ClamAV, with heuristics indicating it functions as a link farm. Multiple URLs extracted from the document point to compromised websites and disposable hosting, suggesting an attempt to redirect users to malicious content. The PDF structure and embedded links are consistent with phishing or SEO-based malicious redirection tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://www.adelaarenergy.com/wp-content/plugins/super-forms/uploads/php/files/26luurnl53jmf8rc92ejka138j/gapesa.pdf In PDF document text
    • http://chineseclothingonline.net/File/48576750581.pdfIn PDF document text
    • https://novamakine.com/upload/ckfinder/files/fojureraxiv.pdfIn PDF document text
    • http://securitydirect.it/wp-content/plugins/super-forms/uploads/php/files/6b80c24dcfe4d78b0b0cf35fb80008d2/xugonexadagutudog.pdfIn PDF document text
    • http://yaeram.com/userData/board/file/15828498423.pdfIn PDF document text
    • https://dreamscapes.ca/dream_scapes/userfiles/files/94983452986.pdfIn PDF document text
    • https://glowskincare.net/wp-content/plugins/super-forms/uploads/php/files/988d3ca382c02ca18479e10330d0337c/60109302269.pdfIn PDF document text
    • https://genegurumiraclehealer.com/userfiles/file/penasodedelevejudu.pdfIn PDF document text
    • https://harpethvalleyhealth.com/wp-content/plugins/super-forms/uploads/php/files/50de20f6d3ecc899acf46d7c398d1988/34340378051.pdfIn PDF document text
    • http://wakingbeauty.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c7b9730a72---69074192414.pdfIn PDF document text
    • http://www.1atlanticfunding.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5a641ef130---vupamuzawakamawamizit.pdfIn PDF document text
    • http://119hero.kr/userData/board/file/nixijefufaperefejotaxogu.pdfIn PDF document text
    • https://www.treehousecare.org/wp-content/plugins/formcraft/file-upload/server/content/files/160710d7345117---kobed.pdfIn PDF document text
    • http://mppscstudy.com/admin/usercontent/file/kilanami.pdfIn PDF document text
    • https://luminex.pl/upload/file/xekib.pdfIn PDF document text
    • http://www.rolstoellift.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b878f331cf4---fezasuvujikunomaz.pdfIn PDF document text
    • https://cpsguffanti.it/uploads/file/sovenedof.pdfIn PDF document text
    • http://xn--9w3b11kh5l.com/ckupload/files/roxijuvigopagarudexejefi.pdfIn PDF document text
    • http://centrons.com/uploaded/file/162378139760de1f14c59e6.pdfIn PDF document text
    • http://villaturri.com/wp-content/plugins/formcraft/file-upload/server/content/files/16097d206035a8---60033517911.pdfIn PDF document text
    • https://zemiigori.com/uploads/file/kujekimubebilebugumuze.pdfIn PDF document text
    • https://xn--1--8kcai1ck2bs.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/1a353cc192450389887650882423ce7f/83950008880.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=que+alimentos+y+bebidas+contienen+cafeinaPDF 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_off0000ecef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECEF 17544 bytes
SHA-256: 277fac4edee4373fb6bacc698ead186d10789c54681b3e6b50ad30d6c0cd6ba1
font_01_sfnt_off000119b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119B9 10952 bytes
SHA-256: dd817f6874d0ab8d8977fad44f4e02b61ac8e116c6135e2f1362b78ff485dad7
font_02_sfnt_off00013336.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13336 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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