Malicious PDF — malware analysis report

Static analysis result for SHA-256 aae98e2b6798434d…

MALICIOUS

PDF

81.3 KB Created: 2021-09-13 02:12:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 0923ba98bccb56e7728fe00f552b9875 SHA-1: 2101ae19e7f2312dcac7dce2f81948a7456e3f00 SHA-256: aae98e2b6798434d990800149ccbef57711e75ad7b801b5388ab9f9f6cb523c3
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to various domains, many of which are associated with compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users. The heuristic 'SE_QR_LURE' suggests the document may instruct users to scan a QR code, a common tactic in phishing campaigns. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 7

  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://crewmak.ru/uplcv?utm_term=qr+code+setup+android+bypass PDF link annotation
    • http://tjsyjdq.com/v15/Upload/file/2021912233825885.pdfIn PDF document text
    • https://preciseenergygroup.com/media/90057552397.pdfIn PDF document text
    • https://hardlineconstruct.ro/app/webroot/files/userfiles/files/64360315834.pdfIn PDF document text
    • http://sportingfoundation.com/uploads/file/48765048048.pdfIn PDF document text
    • https://vildmarksjagt.dk/userfiles/file/kujutediruxuxagemopa.pdfIn PDF document text
    • http://atlantichomeportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c6c0592035---xibojekavubinub.pdfIn PDF document text
    • http://palestraarkadia.it/userfiles/files/gemirisudarotuloko.pdfIn PDF document text
    • https://termokingbt.com/ckfinder/userfiles/files/fidefefigisebofoxefonev.pdfIn PDF document text
    • http://ontheedgeofnow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613487f020493---56901567757.pdfIn PDF document text
    • http://020tzs.com/baige/images/userfiles/file/46891324855.pdfIn PDF document text
    • https://orsam.org.tr/paketler/ckfinder/dosyalar/files/satefudevugegaxanigovod.pdfIn PDF document text
    • https://skvacations.com/userfiles/file/mupoka.pdfIn PDF document text
    • http://www.520amis.com/upload/files/26193921403.pdfIn PDF document text
    • https://aquaticlandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a9efebbab6---113956376.pdfIn PDF document text
    • http://essiac.cz/UserFiles/file/dusagiridinox.pdfIn PDF document text
    • https://plasy.com/uploads/file/26047093611.pdfIn PDF document text
    • http://hongpakthai.com/ckfinder/userfiles/files/85964368899.pdfIn PDF document text
    • https://medicabg.com/uploads/wysiwyg/files/baxelutefujijupok.pdfIn PDF document text
    • https://nistd.in/userfiles/file/todirexasato.pdfIn PDF document text
    • http://pi-consulting.ch/download/jodozemosawaxulawevox.pdfIn PDF document text
    • http://yalcinsezer.com/upload/ckfinder/files/89582320699.pdfIn PDF document text
    • http://saigondome.com/uploads/userfiles/file/jukepowuxobesovaladave.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_off0000d84e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD84E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f060.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF060 17652 bytes
SHA-256: 4dc07a1d81b3ff2b62fcaf02108c85e971e3b4ef2dee0bac00c894196a9e374b
font_02_sfnt_off00011e35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E35 10872 bytes
SHA-256: 07a75bb0dc6d4d0fbd64b5920d3f39e7db4f67ee7e9b44aab3f498ff2078ab1c

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