Malicious PDF — malware analysis report

Static analysis result for SHA-256 e8914fe4a38297d0…

MALICIOUS

PDF

78.7 KB Created: 2021-09-04 05:07:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: e3d0dc672272d631ced5e1457bff75e9 SHA-1: 50d3ec09e918002951f3980f08309a9f2f839850 SHA-256: e8914fe4a38297d0dd78fac15057e2f71ac470a0715f6a6002ad64008275c025
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file was identified as malicious by a ML classifier and ClamAV, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, pointing to numerous compromised or disposable hosting sites, likely to distribute further malicious content or phish for information. The embedded URLs and the PDF structure suggest an attempt to lure users to external, untrusted resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://jinanxintiandi.com/userfiles/files/63455059285.pdf In PDF document text
    • http://hnsunnyfood.com/d/files/lodepedavijujarutunitu.pdfIn PDF document text
    • http://4els.ru/uploads/images/files/dokaranidevaken.pdfIn PDF document text
    • http://metrocars.london/survey/userfiles/files/gigad.pdfIn PDF document text
    • https://www.guestquesttravelmedia.com/wp-content/plugins/super-forms/uploads/php/files/o1nkb29h21n8mavdpqe46uvepr/gozanugebubunoposax.pdfIn PDF document text
    • http://guinyardfamilyreunion.com/clients/62985/File/pijobin.pdfIn PDF document text
    • https://thaiahpa.com/flash/files/27741680775.pdfIn PDF document text
    • http://curry-box-deluxe.de/userfiles/file/41777459714.pdfIn PDF document text
    • http://pferdefreunde-brueckenhof.de/sites/default/files/userfiles/file/wamerokorujabadi.pdfIn PDF document text
    • http://audiomaster.se/wp-content/plugins/formcraft/file-upload/server/content/files/160ca5b3bc7e16---45588840847.pdfIn PDF document text
    • https://cffcommunications.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/160a518aaab274---ridelebagawajakasexel.pdfIn PDF document text
    • http://cityhelps.org/clients/6/61/61afa7a028a8e04f14432b0fece6f2b0/File/59542825392.pdfIn PDF document text
    • https://webtraffic.ch/wp-content/plugins/super-forms/uploads/php/files/gp45f4lgfaj4m9kpoqeofu642u/dimulunevaxuvuvobawemeri.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/1e04840c3b8401bfd98a591784d1f118/samiwaremaluwavivexusu.pdfIn PDF document text
    • http://tryinvest.eu/userfiles/files/fujifujufimifelopu.pdfIn PDF document text
    • http://kinocosmik.ru/sadm_files/71898100506.pdfIn PDF document text
    • https://sofanet.ro/ckfinder/userfiles/files/fanuxaxukupodazakufexuwu.pdfIn PDF document text
    • https://gmonlinestore.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084b49b42f1b---5524049134.pdfIn PDF document text
    • https://webmodeli.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077da47c0502---notikifuketixoje.pdfIn PDF document text
    • https://stmpallet.com/ckfinder/userfiles/files/rigur.pdfIn PDF document text
    • http://gpkoaee.ru/ckfinder/userfiles/files/wegajopumadusezojot.pdfIn PDF document text
    • http://bivalyracing.hu/files/file/9919403434.pdfIn PDF document text
    • http://amphorabeautyclub.com/campannas/file/20758151031.pdfIn PDF document text
    • http://b-solutions.net/userfiles/file/ruxazek.pdfIn PDF document text
    • https://humantouchtranslations.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/16071c672029c9---81379583981.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=factor+theorem+and+remainder+theorem+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_off0000ccaa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCAA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e4bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4BC 18404 bytes
SHA-256: 84a1ddb69c41b639ba2199b7d861048d685cdeb353b254c6a6fdeaa79ed79693
font_02_sfnt_off000114c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114C7 10648 bytes
SHA-256: f56e2ddff62802dc50941e69b439e7b71d9b79fb30e69c271faecde7245e8869

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