Malicious PDF — malware analysis report

Static analysis result for SHA-256 888b7b1721b49667…

MALICIOUS

PDF

87.9 KB Created: 2021-09-05 08:21:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 0e06dec9d7dd470009797c12d12a2ced SHA-1: b323e1895c63c88b669b43884018ce9f87009725 SHA-256: 888b7b1721b4966707b6dd0562cf3f3e0eaf28cf878c288dd2c5d0f99aa973f8
176 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as a phishing trojan and a machine learning model also indicated maliciousness. Numerous embedded URLs were extracted, including one pointing to a raw IP address and others hosted on compromised WordPress sites, suggesting a phishing or malware distribution campaign. The document body was unreadable, but the heuristics strongly indicate a malicious intent to redirect users to external, untrusted resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9746

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://catamma.ru/uplcv?utm_term=rewriting+sentences+worksheet PDF link annotation
    • https://brigitte-farner.ch/userfiles/files/busadedalufedikon.pdfIn PDF document text
    • http://www.gesas.it/media/mailinglist/file/kufivete.pdfIn PDF document text
    • http://lerucherdesanges.fr/userfiles/file/84095401147.pdfIn PDF document text
    • http://www.oneworldkarate.com/fckeditorimages/userfiles/file/bowibupaxisivoramaratopa.pdfIn PDF document text
    • http://104.156.58.56/~web2inbox/wp-content/plugins/formcraft/file-upload/server/content/files/160dcc60d396d7---wefujatovedadube.pdfPDF link annotation
    • https://unosms.us/userfiles/file/libosezutitutorujute.pdfIn PDF document text
    • http://madmojo.com/fckupload/file/73533485414.pdfIn PDF document text
    • http://goldendazzle.com/upload/quangtri/files/96474678622.pdfIn PDF document text
    • http://robwalker.net/fckupload/file/427124842.pdfIn PDF document text
    • https://jairdefreitas.com/ckfinder/userfiles/files/47324524375.pdfIn PDF document text
    • http://phanphoiongnhuahoasen.vn/upload/files/wizeg.pdfIn PDF document text
    • https://bluetact.com/locktactyuma/userfiles/file/13125784374.pdfIn PDF document text
    • http://www.lightingandhvacexpo.com/wp-content/plugins/super-forms/uploads/php/files/b56897e8a69224befd0e91fc803aed04/mosuvujezokav.pdfIn PDF document text
    • https://aparcaderoshaddaichile.cl/uploads/images/files/totamiwavugizamenonili.pdfIn PDF document text
    • http://m2m2design.com/userfiles/vifanubo.pdfIn PDF document text
    • https://ikuseikyokai.jp/ckmedia//files/96228040594.pdfIn PDF document text
    • http://winhazel.com/indigo/ckfinder/userfiles/files/mubojenonakore.pdfIn PDF document text
    • https://ideylia.fr/uploads/file/jodesu.pdfIn PDF document text
    • https://www.lashharmony.co.uk/wp-content/plugins/super-forms/uploads/php/files/09024milm6moni6r1fqk8a3mi9/kakijagubi.pdfIn PDF document text
    • http://www.iamgoingto1996.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608fc79386e94---turukemibikaxi.pdfIn PDF document text
    • http://snookerfootball.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160b76763d8257---79351273238.pdfIn PDF document text
    • https://www.sblending.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160b8c8729e26d---polegekazage.pdfIn PDF document text
    • http://chromoink.com/updates/file/notepepewusa.pdfIn PDF document text
    • https://mmagame.com/userfiles/file/lagukigutavasozapir.pdfIn PDF document text
    • http://argra.rs/wp-content/plugins/formcraft/file-upload/server/content/files/16086583554038---2280102562.pdfIn PDF document text
    • https://essaidafm.com/uploads/FCK_files/file/30817748351.pdfIn PDF document text
    • https://kicksomeglass.com/wp-content/plugins/super-forms/uploads/php/files/4a720b1a7eae6d91b59003c905a940ab/guzenedexefewenaxewine.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000daf9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAF9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f310.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF310 10524 bytes
SHA-256: 9e62d310ba4fd473ce4b0241f7a2f5c474ec55d2c04dda928dbcacdbda394e5b
font_02_sfnt_off00010b0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B0B 19340 bytes
SHA-256: cfcada40eb11ba848c089af3a004cd67d98b5ba9ed310b7b36edd22c4534c369
font_03_sfnt_off00013c05.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C05 16148 bytes
SHA-256: 1c024217ce21bb66922f73502146d3c7616b47413e2e194c36dd680b30e64e78

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