Malicious PDF — malware analysis report

Static analysis result for SHA-256 dd9a6dd26c33664e…

MALICIOUS

PDF

85.2 KB Created: 2021-09-15 16:45:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: fb359dd3d8098b816845bc343818d4a5 SHA-1: c0ec96d5296881c1fb2b5adb51bc84b4b4b48285 SHA-256: dd9a6dd26c33664eaec90da61114f95fa46cbc96cb4927d79e35a3d339d8bf39
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and multiple external URIs pointing to compromised websites, indicating an attempt to host and distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. The presence of embedded JavaScript suggests it may be used to further exploit the user or download additional payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 8

  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. 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://samirkumarpaul.com/ckfinder/userfiles/files/31759125978.pdf In PDF document text
    • http://carrozzeriardue.it/userfiles/files/sataxezuvobejetalazixow.pdfIn PDF document text
    • http://www.smartlandgroup.com/ckfinder/userfiles/files/nafopunupimufaloturojo.pdfIn PDF document text
    • https://dom4m.de/userfiles/files/sataxelemizekugasabos.pdfIn PDF document text
    • http://sieuthicayxanh.vn/webroot/img/files/86098892312.pdfIn PDF document text
    • https://alpasol.e-giant.net/upload/files/54381532553.pdfIn PDF document text
    • https://www.pfgpartners.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161394d984714e---82326599604.pdfIn PDF document text
    • http://propertiesforrent.com/userfiles/file///vosawiji.pdfIn PDF document text
    • https://samsungklima.net/upload/ckfinder/files/likedopi.pdfIn PDF document text
    • http://museodegliarazzimarsala.com/userfiles/files/lebedesijopo.pdfIn PDF document text
    • http://lenosada.sk/editor_uploads/files/90131100644.pdfIn PDF document text
    • http://opusincertum.it/userfiles/files/padijazepixorefomi.pdfIn PDF document text
    • http://www.optionassurance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613a448cc9cbb---fitikifogari.pdfIn PDF document text
    • http://www.kzhep.in.ua/wp-content/plugins/super-forms/uploads/php/files/ei7lln7eqqp0bgbblr0g5klug7/46188427444.pdfIn PDF document text
    • https://www.popcaffe.it/wp-content/plugins/super-forms/uploads/php/files/e32ec9df45527ad70b213489f870b6da/xazozobebin.pdfIn PDF document text
    • http://talleresjpg.es/img/file/niziwoberukolajisexexo.pdfIn PDF document text
    • http://salonlomi.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1614134126146f---dagipubejibofujenetetor.pdfIn PDF document text
    • https://matricula.arendic.cl/files/lerixibugukasipak.pdfIn PDF document text
    • https://arendic.cl/files/60327388594.pdfIn PDF document text
    • https://reaga.net/js/ckfinder/userfiles/files/komozoxutuzexarejewu.pdfIn PDF document text
    • http://rydelko.pl/userfiles/file/radozid.pdfIn PDF document text
    • http://babamoleskine.com/files/file/67649973675.pdfIn PDF document text
    • http://pc580.cn/upload_fck/file/2021-9-1/20210901095250673453.pdfIn PDF document text
    • http://nfrostov.ru/upload/files/lejojesisolomobiwovekulil.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=clownfish+voice+changer+download+iosPDF 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_off0000e88a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE88A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000100a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100A1 10840 bytes
SHA-256: 15dc76476a29c74676893a96057167f491df3df7f7fe120a8ce5e6d36f268f5c
font_02_sfnt_off00011974.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11974 17756 bytes
SHA-256: e9d47580f46420ddeb2f4b4158a51537d36fd2fafd55f9de09c21011880daa33

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