Malicious PDF — malware analysis report

Static analysis result for SHA-256 e4c29f3d8a3738b5…

MALICIOUS

PDF

68.6 KB Created: 2021-09-13 12:14:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 4b1661da5700ae6f1cce4e2cfaa3694e SHA-1: f3270d7b7cb21626b17fc49cfdbe2c38907c20c0 SHA-256: e4c29f3d8a3738b54579c8733e4b716dff46451a6b249f7ee1d754135ffe54f0
156 Risk Score

Malware Insights

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

This PDF was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV identifying it as a phishing trojan. The file contains a link farm pointing to various domains, many of which are hosted on compromised CMS uploads or disposable hosting, suggesting an attempt to redirect users to malicious content or phishing pages. No scripts were extracted, but the structure and URL patterns indicate a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://xn--9d0b102a6wc3y4a.com/sa_upload/userfiles/file/20210906225226.pdf In PDF document text
    • http://eatatrudy.com/uploads/files/17934257145.pdfIn PDF document text
    • https://osiindia.org/ckfinder/userfiles/files/jopakoxotokixoxipurul.pdfIn PDF document text
    • http://opalbiosciences.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132bb723f133---47686233574.pdfIn PDF document text
    • https://badeluxe.com/userfiles/files/wamizemu.pdfIn PDF document text
    • https://www.thic.net/plugin/ce1/ckfinder/userfiles/files/najijobobojilijejokeb.pdfIn PDF document text
    • https://transcendenceit.com/wp-content/plugins/super-forms/uploads/php/files/f899f5d7485f6a2255149e8b81ea82c6/bekukimaguwumofobeserives.pdfIn PDF document text
    • http://apvn.info/userfiles/file/49725691232.pdfIn PDF document text
    • http://win-sonic.com/ck_imgs/files/widorajuwup.pdfIn PDF document text
    • http://makaeximworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/161355d9304c5e---kuraxebu.pdfIn PDF document text
    • http://robbes.nl/media/files/2028788502.pdfIn PDF document text
    • http://www.extramas.com/userfiles/files/babolipujinowigumune.pdfIn PDF document text
    • http://hcbarrett.com/user_area/file/81184182985.pdfIn PDF document text
    • http://golfvillageonline.com/userfiles/file/vegixa.pdfIn PDF document text
    • http://zamgph.com/uploads/file/011307529686.pdfIn PDF document text
    • https://er-cardiff.com/eurostyl/photos/file/mokorerigodi.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613df918d0a55---lemiwijinoxepoxigelel.pdfIn PDF document text
    • https://assurancemauricie.com/wp-content/plugins/formcraft/file-upload/server/content/files/161348f6901f65---nibugalitew.pdfIn PDF document text
    • http://salt17.com/userfiles/files/23611716588.pdfIn PDF document text
    • http://dglytbt.com/upfolder/e/files/20210912004507.pdfIn PDF document text
    • http://tabbanbros.com/admin/fckeditor/editor/filemanager/connectors/upload/file/90092548739.pdfIn PDF document text
    • https://kayakbranson.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f735973a82---9597238096.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=how+to+download+movie+app+on+firestickPDF 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_off0000aee2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAEE2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c6f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6F9 11016 bytes
SHA-256: b144517dbdf0026a9f7ed7051e8a32f2047480193e6df03522f0b8c976188459
font_02_sfnt_off0000e091.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE091 14520 bytes
SHA-256: 6dfaafec07d08e125967df9d66a3318fd1104c5bfc42207818f76041d081ba3c

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