Malicious PDF — malware analysis report

Static analysis result for SHA-256 8d44b60d56c0b904…

MALICIOUS

PDF

87.3 KB Created: 2021-09-15 17:25:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 5d93722179eb763a25482a546f9b5d2b SHA-1: b079d6053267f3a3585a873e75ebe5be466ef037 SHA-256: 8d44b60d56c0b9041accf201af9d1bab7380653971b9b207105db8020ca1cb0e
164 Risk Score

Malware Insights

MITRE ATT&CK
T1059.007 JavaScript T1566.001 Spearphishing Attachment

The sample is a PDF document containing JavaScript that triggers external URI redirects. Heuristics indicate it's a link farm on compromised CMS uploads and disposable hosting, suggesting a phishing or malware distribution lure. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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.
  • JavaScript action low PDF_JAVASCRIPT
    PDF contains a /JavaScript action. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://bike-accessories.supersites.gr/content/ckfinder/files/22608703508.pdf In PDF document text
    • https://alzubidi.com/userfiles/files/51148789085.pdfIn PDF document text
    • https://www.taxiserviceh24.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133028f856f8---lenefufekivesumirunimur.pdfIn PDF document text
    • https://bomando.bomsolar.com/uploadfiles/files/daxobun.pdfIn PDF document text
    • https://assignmentmart.com/ckfinder/userfiles/files/zesanologoguwemawe.pdfIn PDF document text
    • https://vakukh.ru/wp-content/plugins/super-forms/uploads/php/files/8b4e6ea5a61148c5b06141e292e1abd9/1731226486.pdfIn PDF document text
    • http://www.oneworldkarate.com/fckeditorimages/userfiles/file/60831708181.pdfIn PDF document text
    • https://www.businesswatchguardingservices.co.uk/wp-content/plugins/super-forms/uploads/php/files/ttdnrpresvnl0kd3iluqernch7/xexaninurufukajaw.pdfIn PDF document text
    • https://www.taxiserviceh24.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ea5630a329---topopisu.pdfIn PDF document text
    • https://indiantalentjunction.com/milan/media/dexesegu.pdfIn PDF document text
    • https://www.confirmedtour.com/files/vixogugabitizaxaroxe.pdfIn PDF document text
    • http://ekogamma.pl/javascript/ckfinder/userfiles/files/nujaralalonu.pdfIn PDF document text
    • https://myvideoclasses.com/ci/userfiles/files/voturol.pdfIn PDF document text
    • http://www.scea.edu.mn/ckfinder/userfiles/files/41296423890.pdfIn PDF document text
    • http://golden-candies.ru/webroot/files/files/vojuleri.pdfIn PDF document text
    • https://topclassgreenery.nl/images/file/katalenapetoxog.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613eb4bd3e0eb---53677487084.pdfIn PDF document text
    • http://limpiasol.com/wp-content/plugins/formcraft/file-upload/server/content/files/161381054de55b---4140468931.pdfIn PDF document text
    • https://mp2020.csysadmin.com/ckfinder/userfiles/files/35051928062.pdfIn PDF document text
    • https://idosekotthonaveresegyhaz.hu/files/files/78425353996.pdfIn PDF document text
    • https://www.hdontheroadnapoli.it/wp-content/plugins/formcraft/file-upload/server/content/files/161413c690172b---65023191734.pdfIn PDF document text
    • https://cosmopolitanhotel.eu/uploads/wysiwyg/files/99274584936.pdfIn PDF document text
    • http://adance0112.com/upfile/editor/file/ziluzigazituronoje.pdfIn PDF document text
    • http://annabarons.lv/files/files/63225748053.pdfIn PDF document text
    • http://nedvizhimost-v-sharm-el-sheikhe.ru/uploads/files/ginafofekopibelatutuliket.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=swipe+keyboard+androidPDF 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_off0000ef56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF56 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010768.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10768 18340 bytes
SHA-256: 04f0cc5e804d942ae73307b689c6e29de4dbab0384a254789d443c22261678fc
font_02_sfnt_off00013786.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13786 10580 bytes
SHA-256: 435f837298f7c96faa33359260260ad1821f6aa7d06b015a7169d7c8c361c8ac

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