Malicious PDF — malware analysis report

Static analysis result for SHA-256 e701ab441d8545f8…

MALICIOUS

PDF

68.7 KB Created: 2021-10-01 03:44:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 9f47fa0c088e5732c5d1023b8cb8f1ad SHA-1: 0a976c87539ec0dc76be649d543f3f9694d19a0c SHA-256: e701ab441d8545f8613519df0fe57cbb43dbfe68de5124250147f176ec349ad5
176 Risk Score

Malware Insights

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

The file is identified as malicious by ClamAV and an ML classifier, with multiple heuristics indicating it's a PDF link farm. The document contains numerous URLs pointing to potentially compromised websites or disposable hosting, suggesting an attempt to redirect users to malicious content. While no scripts were explicitly extracted, the nature of the link farm and the PDF format suggests potential exploitation or phishing lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://crewmak.ru/uplcv?utm_term=iso+22301+pdf PDF link annotation
    • http://nepalbestcargo.com/userfiles/file/donanejudozu.pdfIn PDF document text
    • https://hotelangela.hu/userfiles/file/57354290982.pdfIn PDF document text
    • https://senesi-sklad.cz/userfiles/file/seragekenogiwifoxuwano.pdfIn PDF document text
    • http://jamoncup.es/wp-content/plugins/formcraft/file-upload/server/content/files/161333bc12915f---rivurowonugizig.pdfIn PDF document text
    • http://mya1fc.com/files/ckuploads/files/supitasuzegipi.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/b524925ffd10d228bda20b1d476405a4/69383983572.pdfIn PDF document text
    • http://bogaarchitetti.it/userfiles/files/bazuretasugarakavin.pdfIn PDF document text
    • http://140.121.125.49/ckfinder/userfiles/files/20210914_120643.pdfPDF link annotation
    • http://haiannweb.com/uploads/files/bidolaxiveledupubavo.pdfIn PDF document text
    • http://metalltechnik-kutschi.at/30869216854.pdfIn PDF document text
    • http://uk-finansist.ru/userfiles/file/gikopejid.pdfIn PDF document text
    • http://papinchess.ru/userfiles/file/40721639657.pdfIn PDF document text
    • http://alltimescare.com/attachment/files/nupewimixituli.pdfIn PDF document text
    • http://cartopack.com/Images/file/vanojifufovug.pdfIn PDF document text
    • https://cursosadistanciayonline.com/medios/files/wonuwebajofifimosesiporif.pdfIn PDF document text
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/3a7d14756f8b466d84db662c003b07a7/kumowukelewujavolatog.pdfIn PDF document text
    • http://paraglider24.de/pics/fotos/1/file/60561643019.pdfIn PDF document text
    • http://kuryakyn.ru/userfiles/file/19653886718.pdfIn PDF document text
    • https://dazzlin.co.uk/wp-content/plugins/super-forms/uploads/php/files/ebc0781d9434632ee862f0587a2be517/niriputuxisojitoli.pdfIn PDF document text
    • http://kosmonautika.ee/ckfinder/userfiles/files/18983411915.pdfIn PDF document text
    • http://xn--66-6kc8bfmkmjd.xn--p1ai/admin/ckfinder/userfiles/files/15806181699.pdfIn PDF document text
    • https://fruitssupplier.com/app/webroot/img/files/15648341184.pdfIn PDF document text
    • https://kemxoi.vn/app/webroot/files/images/pages/files/79913632654.pdfIn PDF document text
    • http://nawooelcs.com/upload/userfiles/2021/09/files/210911095152.pdfIn PDF document text
    • https://perkunasstudio.com/uploads/files/202109201102061765.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_off0000b0e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB0E9 10176 bytes
SHA-256: 4847b8ae503115a521332ab9f6bce000182df0a289de9577fb21991090fdd9ac
font_01_sfnt_off0000c7d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7D7 14916 bytes
SHA-256: 7f6823eb2daff6b3137bbc5fd370d56b03fe3ba0e45ca3688d7db8a54ad24f57
font_02_sfnt_off0000ed85.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED85 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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