Malicious PDF — malware analysis report

Static analysis result for SHA-256 4e91163107aae8e0…

MALICIOUS

PDF

79.7 KB Created: 2021-09-08 20:04:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 8d76eafb3804cc73c744a387ecb9a052 SHA-1: 5127bc56a8b60e978473f6d89f13cf71e3bddf52 SHA-256: 4e91163107aae8e0289170e97db34c29bfff06f110657562e516d0b6b7e958be
156 Risk Score

Malware Insights

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

The file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, directing users to multiple potentially compromised or disposable hosting sites. The presence of numerous PDF links, including one hosted on a compromised WordPress upload directory, suggests an attempt to distribute further malicious content or conduct phishing operations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://ashleymongolia.mn/uploads/files/86842224272.pdf In PDF document text
    • http://zubrcup.by/files/files/bedusasasuxawuruguwi.pdfIn PDF document text
    • https://pmapmc.com/userfiles/image/files/25430937258.pdfIn PDF document text
    • http://ideal-site.ru/userfiles/file/pirunukonobobaju.pdfIn PDF document text
    • http://madiagranitosilano.it/userfiles/files/77688236930.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/161310b0af1415---vizuponapomiwalifibejitew.pdfIn PDF document text
    • https://agri-mal.pl/userfiles/file/sowuxuzinezuvirepe.pdfIn PDF document text
    • https://samngaimarble.com/html_upload/file/zonitudojekoxune.pdfIn PDF document text
    • https://binhvi.com/upload/files/fizoriwimuzupamu.pdfIn PDF document text
    • https://warungmimpishio2.com/contents/files/xumapakez.pdfIn PDF document text
    • http://xn--franzsischebulldoggen-lec.eu/userfiles/file/nizuposizi.pdfIn PDF document text
    • http://wohntraumgmbh.at/6774742532.pdfIn PDF document text
    • http://www.oteliapelsin.ru/ckfinder/userfiles/files/gepivaxofomixalera.pdfIn PDF document text
    • https://mamproducciones.es/wp-content/plugins/formcraft/file-upload/server/content/files/16137c142369d8---seratap.pdfIn PDF document text
    • http://dainichiji.com/upload_ckr/files/62177119235.pdfIn PDF document text
    • http://plenerowe.kbo.pl/ckfinder/userfiles/files/luwilelakalakati.pdfIn PDF document text
    • http://geology.ie/wp-content/plugins/formcraft/file-upload/server/content/files/161302df3d786d---zaxovatuzojiwos.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=teoria+y+politica+monetaria+pdfPDF 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_off0000d2c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2C5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ead7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAD7 18120 bytes
SHA-256: 8421275cb8d8777e4cfd08dd815837826fff1ff279a088fdde429db4ec28773c
font_02_sfnt_off000118c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118C9 10688 bytes
SHA-256: c5b8d6fe0865b63907b641059ecd65e6ab94d2bb01428c5a0e6919c8d1cf5c8e

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