Malicious PDF — malware analysis report

Static analysis result for SHA-256 b8ab4621d4b69c6b…

MALICIOUS

PDF

74.4 KB Created: 2021-09-25 12:56:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: a84a3e0b90b2a6daa40a55fba0121c1c SHA-1: 671f2e6deb6b5310abd1458f3240385b4458951b SHA-256: b8ab4621d4b69c6b38fb25caa4027ffe7fef791815be171998cd4faf98520106
156 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous embedded URLs pointing to compromised WordPress sites and disposable domains, suggesting it functions as a link farm. The primary purpose appears to be redirecting users to potentially malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://smidgel.ru/uplcv?utm_term=how+long+is+raw+chicken+good+in+the+refrigerator PDF link annotation
    • https://veterinarycarefoundation.org/userfiles/file/12208152543.pdfIn PDF document text
    • https://happycolaborativo.com/uploads/files/wupuzekagexuwatim.pdfIn PDF document text
    • https://www.sesc-am.com.br/Selecao/ckfinder/files/motiwixolunaxamikifolas.pdfIn PDF document text
    • http://musicpark-live.de/userfiles/file/wolebediwevipovi.pdfIn PDF document text
    • https://hsegroup.ru/wp-content/plugins/super-forms/uploads/php/files/5k951820sk771pnjk1bbtf6to4/23500784200.pdfIn PDF document text
    • https://finestblogger.de/wp-content/plugins/super-forms/uploads/php/files/61i7undlioqjhsg91dj5o5hihp/41960361138.pdfIn PDF document text
    • https://lcd96.ru/wp-content/plugins/super-forms/uploads/php/files/3ee1d8987839e6dc582b0715397f05e3/minoxirox.pdfIn PDF document text
    • https://chupwo.com/editor_upload/file/70830415300.pdfIn PDF document text
    • https://www.institutvzdelavani.cz/files/74979699932.pdfIn PDF document text
    • https://idroilektriki.gr/files/file/kijudofavekixazefovokoxa.pdfIn PDF document text
    • http://spbi.cz/res/file/99808814680.pdfIn PDF document text
    • https://amesmedicalservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d0b3b4deaf---77837229076.pdfIn PDF document text
    • http://akekaluck.com/ckfinder/userfiles/files/42464220080.pdfIn PDF document text
    • http://www.ondebiz.com/userfiles/file/11105531511.pdfIn PDF document text
    • https://webmanagement.produse-electrice.ro/images/file/77743170883.pdfIn PDF document text
    • http://willtorock.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614c9ab9cd3ba---bodezubom.pdfIn PDF document text
    • http://hwangtosidae.com/userData/ebizro_board/file/94847871371.pdfIn PDF document text
    • https://kakvkusno26.ru/wp-content/plugins/super-forms/uploads/php/files/51a27f2af0e7f25f8dabff9bb40c95da/6639431384.pdfIn PDF document text
    • http://tcgardening.com/userfiles/file/2021092108351673499.pdfIn PDF document text
    • http://xenangheli.vn/public/files/94712574069.pdfIn PDF document text
    • http://www.c-l-r-p.com/admin/ckfinder/userfiles/files/tuvaj.pdfIn PDF document text
    • https://littleedupark.com/ckfinder/userfiles/files/remuxemafodelin.pdfIn PDF document text
    • http://nuk-amro.de/userfiles/file/30975648209.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_off0000ba60.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA60 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d272.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD272 18628 bytes
SHA-256: 660cddbfd2d9ae69cadbbee9b316a5084913faa2afbb0107fa2aacc36cd37643
font_02_sfnt_off00010266.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10266 10924 bytes
SHA-256: f2d2663d7c0f572a314aa150611fff05926b43f3efb6ac835959a9d36dc4d315

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