Malicious PDF — malware analysis report

Static analysis result for SHA-256 2cd05a54b98bb05e…

MALICIOUS

PDF

85.8 KB Created: 2021-10-10 14:52:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: 2b7f2d4249a130ac8904ac87921bfee3 SHA-1: 483fcd16d0b36d1770826b10cd340a556d33f4d2 SHA-256: 2cd05a54b98bb05e9bb95100399c2effb0aba7c72c228a8b9556dec75111f548
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It functions as a link farm, directing users to numerous external URLs, many of which are hosted on compromised or disposable domains. The presence of 'utm_term_redirector=True' suggests an attempt to disguise the malicious nature of the links and potentially track user engagement with phishing lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://synerhu.ru/uplcv?utm_term=the+most+dangerous+game+escape+room+answers PDF link annotation
    • http://china-miyaco.com/img/file/2021109152659.pdfIn PDF document text
    • http://medica-eg.com/userfiles/file/xavipowafuz.pdfIn PDF document text
    • http://chipgene.com/image/files/20210905_233452.pdfIn PDF document text
    • http://www.maarsehoveniers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16133fdb03670e---14078861083.pdfIn PDF document text
    • http://innospectrum.eu/hirlevel/file/59610822295.pdfIn PDF document text
    • http://reclaimsplus.com/wp-content/plugins/super-forms/uploads/php/files/e0dbc53b7a3b51ebde62c25beedf3d45/53139987244.pdfIn PDF document text
    • http://aajude.pt/backoffice/ckfinder/userfiles/files/solukuxisotupise.pdfIn PDF document text
    • http://picart-personal.pl/fckupload/upload/file/78616320413.pdfIn PDF document text
    • http://beijingxinzhi.com/userfiles/file/20211009142421_1291147133.pdfIn PDF document text
    • http://recruiters-zone.com/wp-content/plugins/formcraft/file-upload/server/content/files/1615cd091ddf60---78242045327.pdfIn PDF document text
    • https://propactionvehiclesuk.tv/userfiles/files/turalixalipelimeruva.pdfIn PDF document text
    • https://pelicanfinancialnetwork.com/ckfinder/userfiles/files/8723874373.pdfIn PDF document text
    • http://cravaluos.com/ckfinder/userfiles/files/belinefomugivaxe.pdfIn PDF document text
    • https://ostrichpharmaceuticals.com/userfiles/file/bulejavekafuzazeb.pdfIn PDF document text
    • http://msinziniering.com/userfiles/file/77035328979.pdfIn PDF document text
    • http://stmrcstvm.com/userfiles/file/20178644374.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/guludadedinipenadudadel.pdfIn PDF document text
    • http://mya1fc.com/files/ckuploads/files/48098269965.pdfIn PDF document text
    • http://opalbiosciences.com/wp-content/plugins/formcraft/file-upload/server/content/files/1615adf5744050---1655407967.pdfIn PDF document text
    • http://www.oknookna.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16156932843852---wofutorigutuburukafifan.pdfIn PDF document text
    • http://agisma.ru/files/pages/files/zavovalamiwexolifazumuz.pdfIn PDF document text
    • https://noble-worldwide.com/wp-content/plugins/super-forms/uploads/php/files/09dc06fe6640b324247b646ff8cbaa3c/50015816290.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_off0000e626.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE626 18468 bytes
SHA-256: 71b1a8c92184574e52f5b5f6ab1069b7e72028aa4e484f7f5cc96600e762da50
font_01_sfnt_off00011673.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11673 10972 bytes
SHA-256: 284f6175c44a7afeac7be1f6c1f72243f0abce081f736b81656b5564620b4aa1
font_02_sfnt_off00012fa8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12FA8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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