Malicious PDF — malware analysis report

Static analysis result for SHA-256 fc5a19f1f19109bb…

MALICIOUS

PDF

95.6 KB Created: 2021-07-31 05:54:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 2fbc4630b024b7d06f41fde0f2c83872 SHA-1: 6ce68bb09861244bed54119a84e6a6348cc0513d SHA-256: fc5a19f1f19109bb9d9b2fc2102b8bf54ad1adc2267403c0f0010fe06954710d
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to multiple domains, many of which are associated with compromised CMS uploads or disposable hosting, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were directly extracted, the PDF structure and URL patterns are consistent with a phishing lure designed to trick users into downloading a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9895

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://budohurtsa.pl/userfiles/file/bekibanikiwima.pdf In PDF document text
    • http://tubietelbar.hu/uploadfile/42374571261.pdfIn PDF document text
    • http://agcslohian.com/userfiles/file/41465187419.pdfIn PDF document text
    • http://pocatellocampfire.com/wp-content/plugins/super-forms/uploads/php/files/g3v9itc0a56jbcopglqq2hj4hv/25249925983.pdfIn PDF document text
    • https://schreinerheusi.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607094a2115a5---pitep.pdfIn PDF document text
    • http://mountmedpharmacy.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160e1acdf39df7---jitataluno.pdfIn PDF document text
    • http://mamtomchabahai.com/uploads/files/files/24730223988.pdfIn PDF document text
    • http://matrixuniverzum.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1609d3eb6f1bd4---71136753687.pdfIn PDF document text
    • http://melissajacksonmd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607473bc257cc---19050758475.pdfIn PDF document text
    • https://asiquim.com/ckfinder/userfiles/files/bifidafutaxejomedefepevo.pdfIn PDF document text
    • http://joyear.com/ckfinder/userfiles/files/32999842816.pdfIn PDF document text
    • https://criteriacambio.com.br/wp-content/plugins/super-forms/uploads/php/files/kcnk2iap3491r90i859iqph3m6/bikuwitamoxujarexo.pdfIn PDF document text
    • http://upasamed.org/Content/uploads/files/rofitisefamago.pdfIn PDF document text
    • http://sukhabalka.com/files/file/lafudamaxisenovesosevozoz.pdfIn PDF document text
    • https://bursakaynak.com/userfiles/file/jaberoxufesow.pdfIn PDF document text
    • https://aquariumfargo.com/wp-content/plugins/super-forms/uploads/php/files/37d335868df16e534c86e39d0e65f4a2/40053714335.pdfIn PDF document text
    • https://ohcsi.com/ckfinder/userfiles/files/kifuvaviwul.pdfIn PDF document text
    • http://fitviewer.biz/files/file/48627748376.pdfIn PDF document text
    • http://xn--e1aazeoc7d.xn--p1ai/images/shared/file/diwitegowe.pdfIn PDF document text
    • http://norview63.com/clients/5/59/59ba6e1aa7224642a1eeb14435756cbf/File/vusevep.pdfIn PDF document text
    • https://amalighting.com/wp-content/plugins/super-forms/uploads/php/files/38e0b1076b82850b179e46863f1b1d6b/gekodegedizeza.pdfIn PDF document text
    • http://andreagarciam.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c238eb6c73d---varidole.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=spider+man+3+game+free+download+for+android+apk+%2B+dataPDF link annotation
    • http://medlab.webd.pl/upload/file/10414647991.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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ecda.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECDA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000104ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104EC 18644 bytes
SHA-256: b88b729483d8793774d78485c06af177df6169f66928730eddddaf99ba03fef0
font_02_sfnt_off00013562.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13562 1692 bytes
SHA-256: 6df00093d1a1fd8b8f95901b42ba2863538c90606311dd4adf1993a433792d13
font_03_sfnt_off00013d6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D6B 11096 bytes
SHA-256: 5ad3fc4ea4987e68285adbd04468e5367f11b16786897efdc72dc1e53866d3fa
font_04_sfnt_off0001571b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1571B 16944 bytes
SHA-256: 276afa00d3d79323f4b8e598694862add187d22a3c4f9b7a0c38dfb7d18d16f7

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