Malicious PDF — malware analysis report

Static analysis result for SHA-256 37e894ac2279a042…

MALICIOUS

PDF

82.8 KB Created: 2021-06-29 01:04:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 84b6b3d4ec96d327ef9d29b7ff4f5716 SHA-1: 10f94c3e93dc424eecaa63b656ead23b14c5614d SHA-256: 37e894ac2279a0426aa8a4de6394f5818df624f0138e77ee8ce02be483a0700f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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://itaindustrial.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c2e40e5912d---depino.pdf In PDF document text
    • https://truck-diagnostic.ru/wp-content/plugins/super-forms/uploads/php/files/11c497ba6d901ac9bff36aa66b01d863/17704634192.pdfIn PDF document text
    • https://ballestermultiservicios.com/wp-content/plugins/formcraft/file-upload/server/content/files/160833dc0231fb---12317922607.pdfIn PDF document text
    • https://mamproducciones.es/wp-content/plugins/formcraft/file-upload/server/content/files/160b9e49cc7747---73031740099.pdfIn PDF document text
    • https://omomediacion.com/wp-content/plugins/super-forms/uploads/php/files/37820f7d8057ae89e4a47ba387a2009f/numepavobetopatudij.pdfIn PDF document text
    • https://boumqueur-edition.com/upload/fckeditor/file/kamabawujediku.pdfIn PDF document text
    • https://vmwarts.com/ecovic/file/digerumesaxanato.pdfIn PDF document text
    • http://nensi.si/upload/file/revizatumakikewowodonago.pdfIn PDF document text
    • http://www.caribbeandentist.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077f8ff252ba---fosuvubowig.pdfIn PDF document text
    • http://uniquecharacters.com/upload/files/60183502997.pdfIn PDF document text
    • https://harpethvalleypto.org/wp-content/plugins/super-forms/uploads/php/files/bfd3d4fa46f2f24983f6efe6e47f57ad/64748953217.pdfIn PDF document text
    • https://inchiriereelicoptere.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1606c9a47b28dc---guxipuv.pdfIn PDF document text
    • http://shinex-auto.com/userfiles/file/84346333965.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/29degdcqc0h0a0nqdqta24sl5h/23453600208.pdfIn PDF document text
    • https://alutat.com/data/file/kesijobovi.pdfIn PDF document text
    • https://www.sahabatkeluargahomecare.com/wp-content/plugins/formcraft/file-upload/server/content/files/160941d1612a0f---6194057926.pdfIn PDF document text
    • http://vitaminyplus.eu/files/file/47765064545.pdfIn PDF document text
    • http://villa-carlshorst.de/sites/default/files/file/voduxugamul.pdfIn PDF document text
    • https://joepromenshealth.com/wp-content/plugins/super-forms/uploads/php/files/af651daaf86f28fdf0623b01b59c80f7/32601823915.pdfIn PDF document text
    • https://aguiapromocional.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b82622384a6---62017268720.pdfIn PDF document text
    • http://windowsplusllc.com/ckfinder/userfiles/files/19342751934.pdfIn PDF document text
    • http://ballmillfactory.com/d/files/kikekezaviruvupaxexinefu.pdfIn PDF document text
    • https://comobrew.com/newsite/images/user_uploads/file/boparexagefonigareri.pdfIn PDF document text
    • http://tipiland.net/upload/file/25668752413.pdfIn PDF document text
    • https://aquariumfargo.com/wp-content/plugins/super-forms/uploads/php/files/0c1551665510d1ddca5c302e171d5876/43038332551.pdfIn PDF document text
    • http://www.theagentpipeline.com/wp-content/plugins/formcraft/file-upload/server/content/files/160807732af879---94653884892.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=daily+inspiration+robin+sharma+pdf+free+downloadPDF 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_off0000dfc3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFC3 11104 bytes
SHA-256: 9800ccbba4dbeff6152482360f1539d98ef1245c2053b6068b2a4b34f6980f16
font_01_sfnt_off0000f948.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF948 17040 bytes
SHA-256: 065d31bd33d535ed2b9c378ed467f1a931a65b6017a84738efb51ed303f3a8b2
font_02_sfnt_off00012561.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12561 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1