Malicious PDF — malware analysis report

Static analysis result for SHA-256 cebb2011e99f0ae8…

MALICIOUS

PDF

81.9 KB Created: 2021-09-07 09:46:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: dfab0e52b752ee6a687a9abbe2c6ec66 SHA-1: e94a21c3cce9a2464274123896cf54e1114582fa SHA-256: cebb2011e99f0ae88994e6ed246034cc8547d51d50a431f592fee45a2ee909a7
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious. It contains numerous embedded URLs, many of which point to compromised CMS uploads or disposable hosting, forming a link farm. The presence of these links suggests an attempt to lure users to external sites, likely for phishing or to download further malicious content. No scripts were extracted, but the structure and URL patterns are indicative of a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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 http://www.derbysignandgraphics.com/uploads/file/xupiramebej.pdf In PDF document text
    • http://casaatlantida.com/userfiles/file///9855403194.pdfIn PDF document text
    • http://cgt-fo-csc.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160b34621ec170---lofufimivafumoge.pdfIn PDF document text
    • http://agcslohian.com/userfiles/file/27797542931.pdfIn PDF document text
    • http://www.lbf-cosmetics.com/website/wp-content/plugins/formcraft/file-upload/server/content/files/160702a3b825bb---76439181964.pdfIn PDF document text
    • https://gulceoyunlar.com/calisma2/files/uploads/55214860335.pdfIn PDF document text
    • http://jointrilogy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608bf7ddcf69c---vukedak.pdfIn PDF document text
    • http://www.firengo.com/userfiles/files/72467420990.pdfIn PDF document text
    • http://escolacaritas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b892b1bcb21---13135048444.pdfIn PDF document text
    • http://natur-pet.cz/webpagebuilder/ckfinder/userfiles/files/86502515393.pdfIn PDF document text
    • https://realestateconnect.biz/wp-content/plugins/super-forms/uploads/php/files/9i5h9a5hl4hsfb0o2smb2d3qg7/70074018303.pdfIn PDF document text
    • https://mediabandit.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099b8ab99131---87918284140.pdfIn PDF document text
    • https://karinbentum.nl/uploads/file/nawapofafosudis.pdfIn PDF document text
    • https://krantiservice.com/ckfinder/userfiles/files/gimuxigilivak.pdfIn PDF document text
    • http://sieuthibongda.net/ckfinder/userfiles/files/90212482690.pdfIn PDF document text
    • http://104.156.58.56/~web2inbox/wp-content/plugins/formcraft/file-upload/server/content/files/160c0ece65f7b3---11554491353.pdfPDF link annotation
    • http://yasaitogo.com/uploads/files/jaxuviferadonisezuw.pdfIn PDF document text
    • https://www.bouwenaaneensterkwerkgeversmerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16076f13985ae0---78041201140.pdfIn PDF document text
    • http://baaningdoi.com/file_media/file_image/file/mevufinakedopegifevup.pdfIn PDF document text
    • http://nnk.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160b1c68500efc---397145992.pdfIn PDF document text
    • https://clubsportedinburgh.org/userfiles/files/zovuxusexagelabaz.pdfIn PDF document text
    • https://betentour.com/sites/default/files/file/29376850699.pdfIn PDF document text
    • https://www.properties-thassos.com/wp-content/plugins/super-forms/uploads/php/files/crm1nh78lvo9t6hhtof0du9lfv/32385219179.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=chemical+composition+of+aloe+vera+gel+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_off0000db59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB59 17348 bytes
SHA-256: e5e62ef7db0a87d489e86af5a0a009a1139f8805b86436abd7f905fbb50c24a9
font_01_sfnt_off00010828.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10828 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001203f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1203F 11164 bytes
SHA-256: a5f121bca216788528365ab97121a571e33895d9a2fac60624d8e8c35bce34a1

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