Malicious PDF — malware analysis report

Static analysis result for SHA-256 42acd2b994c58f42…

MALICIOUS

PDF

107.5 KB Created: 2021-07-05 15:33:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: c6c7abe603055aeec51c78d1e488c06c SHA-1: da589549474e2314be5b0056f088ad3a77553cd8 SHA-256: 42acd2b994c58f42f50fea14cb2ffb1fe4aaf34fa1bd6cb68273a9fdc5f4e198
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with multiple URLs pointing to compromised WordPress sites. These links likely serve as a lure to redirect users to malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9746

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://www.immiflex.com/wp-content/plugins/formcraft/file-upload/server/content/files/160735f7c254de---tekalasudukapisaja.pdf In PDF document text
    • https://pmms-online.com/assets/file/12477232780.pdfIn PDF document text
    • http://ordinate-ltd.com/file_media/file_image/file/betozuderenajufewilos.pdfIn PDF document text
    • https://intelean.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074b48852f02---fipibure.pdfIn PDF document text
    • http://barudan.hk/UploadFile/file/20210519114807254.pdfIn PDF document text
    • http://bi-acaovo.com/upload/files/wegiviforuvaxekus.pdfIn PDF document text
    • https://anukulagrotech.com/userfiles/file/84390824152.pdfIn PDF document text
    • https://useoneconvo.com/wp-content/plugins/super-forms/uploads/php/files/7bb61fc5fe7948b0903b8da7f65bfc15/nigenopuxibib.pdfIn PDF document text
    • https://medok18.ru/wp-content/plugins/super-forms/uploads/php/files/3fd3e77c904ef99c92fc0853a98a023e/xekabolawemekavufuxuz.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c44a23034e1---85389546527.pdfIn PDF document text
    • http://www.yourhealthyourchoice.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a345c255981---tedemukuwujuto.pdfIn PDF document text
    • http://crystalnymph.by/wp-content/plugins/super-forms/uploads/php/files/cb7fe07a5f4aec7fcac3dd6a4ead1668/jezebobezamuzedadepisave.pdfIn PDF document text
    • http://clear-es.net/yamituki-n/uploads/files/17349616748.pdfIn PDF document text
    • http://bajcsidavidfoto.com/_user/file/pelasarigaxogud.pdfIn PDF document text
    • http://abwferrellpkwy.com/uploads/files/pojedemawotomuv.pdfIn PDF document text
    • https://www.heainc.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076fc0ff0490---80611236916.pdfIn PDF document text
    • https://www.straightmyteeth.com/wp-content/plugins/super-forms/uploads/php/files/0f66bfa1f234f69ba6dd3bb6261905d1/37466846053.pdfIn PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/bac45403a7116b9a9ddeaa544c0e8ac3/jozunotirazum.pdfIn PDF document text
    • https://rescue.bg/wp-content/plugins/formcraft/file-upload/server/content/files/160c1951684f4a---26511725488.pdfIn PDF document text
    • http://plenaadoracao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160ba5a3e3ba37---gokulomavopuzisij.pdfIn PDF document text
    • http://averon.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160a344b628782---volefixenunoxunet.pdfIn PDF document text
    • https://jahanchart.ir/data/files/file/mederi.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/k36pln0j1l8q1k0ouabh4vmgn2/burisugufagogogol.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=how+to+get+dracozolt+in+pokemon+sword+and+shieldPDF 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010b20.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B20 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001232d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1232D 7572 bytes
SHA-256: c6ed786eab98d28e27515f49f639282b37c96f81ec3211c9c86873d5a56c241a
font_02_sfnt_off00013d85.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D85 16160 bytes
SHA-256: 27fa49ca30b1f57c6e4f8b99ad1f73ead7010ce1f191e20d716503af09158f46
font_03_sfnt_off000152fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x152FA 18708 bytes
SHA-256: aeb05b4a56e7ba01c0c1e5b1d6379b2a3af153c626e30234c11328ac896240ea
font_04_sfnt_off0001839d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1839D 11188 bytes
SHA-256: 47a09631d2e71d8c6e7deb64cc38ede0f27e1c67955d30ef37db14dbb3327ece