Malicious PDF — malware analysis report

Static analysis result for SHA-256 c16bf38d1fc5fa5b…

MALICIOUS

PDF

85.1 KB Created: 2021-09-04 23:51:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: ccd0e44e6039709406cce721d1cfeabd SHA-1: fc91ba05a8e9fe2d05c326c72ec04dcdc3750d08 SHA-256: c16bf38d1fc5fa5b64def38152c2c7da0a8792eada16abbfb2b32e00579f62cd
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to various websites, many of which are hosted on compromised CMS upload directories or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or distributing further malware. The presence of a link farm suggests an attempt to manipulate search engine results or direct users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 6

  • 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.
  • 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.megasaludips.com/wp-content/plugins/formcraft/file-upload/server/content/files/16112ae204a1cc---vojamobipuler.pdf In PDF document text
    • https://postscriptproductions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f34ef87002a---44110716117.pdfIn PDF document text
    • http://babywagen24.de/userfiles/file/76558921030.pdfIn PDF document text
    • https://dcimx.com/files/ridemutosevaverupadijedo.pdfIn PDF document text
    • http://droprint.my/home/ququ4923/public_html/userfiles/file/56152379961.pdfIn PDF document text
    • http://bike-aholic.com/UserFiles/file/xijuxekegabera.pdfIn PDF document text
    • https://fibaquitaine.fr/cebatrama/userfiles/files/bitiwebozovatuvikanowami.pdfIn PDF document text
    • http://bindashnews.com/userfiles/file/zabexaxo.pdfIn PDF document text
    • http://www.atrium-tuiles.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a91b43d4e52---josatukovapolagarozurun.pdfIn PDF document text
    • https://www.mercedesbenzofaustinservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160867092e3940---81897717336.pdfIn PDF document text
    • https://mar3ol.com/Files/files/11854247967.pdfIn PDF document text
    • https://www.advids.io/wp-content/plugins/formcraft/file-upload/server/content/files/1607482f256f55---84822972369.pdfIn PDF document text
    • https://emprenderem.cl/files/26068868871.pdfIn PDF document text
    • https://biroestarsa.hu/uploads/file/31223834606.pdfIn PDF document text
    • http://yoga-privates.com/yoga-privates/file/vugazarukegemokub.pdfIn PDF document text
    • https://mudateconmigo.cl/wp-content/plugins/super-forms/uploads/php/files/3d02e7be6032947ba4f729b6e1ef0bf3/2864110065.pdfIn PDF document text
    • http://innovad-ltd.com/userfiles/file/nabixabuk.pdfIn PDF document text
    • http://3handseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac89b24a515---nudisodalafebajimoxase.pdfIn PDF document text
    • http://circolonauticofavignana.it/userfiles/files/lilubi.pdfIn PDF document text
    • http://businessplan-capalpha.eu/mbp/upload/images/images/upload/ckfinder/89657573786.pdfIn PDF document text
    • https://carthink.org/wp-content/plugins/formcraft/file-upload/server/content/files/160723564bf43a---80565925451.pdfIn PDF document text
    • http://ricoconsultingattorney.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/28191409339.pdfIn PDF document text
    • http://remont-etalon.ru/upload/files/80563355983.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=introducing+physical+geography+6th+edition+pdf+free+downloadPDF 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_off0000e3db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3DB 11320 bytes
SHA-256: 469ad4fe953b2b04dbb71bd663bfccdfd790a4abce028e265378eb694ac341f0
font_01_sfnt_off0000fe45.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE45 18672 bytes
SHA-256: b4f377c64153568bbd59b33b43c0ec4dce68d2e5e20d8dc31aa269137a1d008f
font_02_sfnt_off00012e94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E94 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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