Malicious PDF — malware analysis report

Static analysis result for SHA-256 4320d13c6d279cb5…

MALICIOUS

PDF

85.7 KB Created: 2021-09-18 05:33:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: ca02d2d532bde72b99e4ff57b0a48e3d SHA-1: 0796c62fe84596b6b8c13f19c4ab54c17d5d9813 SHA-256: 4320d13c6d279cb5c59b18fe0eeba1f31a51e61de4c14e2cff224ad3fe5672cb
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to various domains, many of which are identified as link farms on disposable or potentially compromised hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of multiple external URIs and link farm heuristics supports the classification as a malicious link distribution mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://nhasachnguyenvancu.com/Images_upload/files/2022305373.pdf In PDF document text
    • https://hefcom-hydraulics.com/ckfinder/userfiles/files/lajib.pdfIn PDF document text
    • https://emailing-online.fr/uploads/userfiles/file/kogufoguvipununiladunotit.pdfIn PDF document text
    • https://www.traveltimevipp.com/wp-content/plugins/super-forms/uploads/php/files/af82684e51694cee699ff3e497913fd6/nibixopirupogusam.pdfIn PDF document text
    • https://infiniteprospects.com/FCKeditor/file/zirawa.pdfIn PDF document text
    • http://munnarteabungalows.com/userfiles/file/guposove.pdfIn PDF document text
    • http://ohmamakitchen.com/uploads/files/tomedonikopusudobupakali.pdfIn PDF document text
    • https://manhremhoangvan.com/wp-content/uploads/files/woronerekidoto.pdfIn PDF document text
    • https://7foro.exceltur.org/exceltur_nuevo/ckfinder/userfiles/files/9477329188.pdfIn PDF document text
    • https://bearings.vn/images/ckeditor/files/kevitiwiw.pdfIn PDF document text
    • http://skyrybupaslaugos.lt/uploads/files/guronejowexazotewiboli.pdfIn PDF document text
    • http://suliaox.com/v15/Upload/file/20219131353549551.pdfIn PDF document text
    • http://eko-baby.ru/userfiles/file/11896466332.pdfIn PDF document text
    • http://matonaklawfirm.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/66699609452.pdfIn PDF document text
    • http://carrozzeriardue.it/userfiles/files/tagufibipamafarimurax.pdfIn PDF document text
    • http://www.puhito.hu/uploads/pinem.pdfIn PDF document text
    • https://stormester.no/files/file/sasimowawinuwevul.pdfIn PDF document text
    • http://phunggia.biz/userfiles/file/66534758364.pdfIn PDF document text
    • https://binarbaid.com/public_html/userfiles/file/mesasepuxozuleduvorum.pdfIn PDF document text
    • http://paddockj.com/user_data/editor/ckfinder/core/connector/php/upload/files/88046489779.pdfIn PDF document text
    • http://admio.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16140b9e1c8b8f---misewuragim.pdfIn PDF document text
    • https://nationalcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/161416d6c09d02---86680681716.pdfIn PDF document text
    • https://proff-doors.ru/wp-content/plugins/super-forms/uploads/php/files/2682a70109f1778e815f4295e869fc47/32251765090.pdfIn PDF document text
    • https://bestofbucerias.com/upload/file/18465433486.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=android+drm+pluginPDF 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_off0000e719.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE719 19836 bytes
SHA-256: ee42dab4a70e4fac6ae25806f61dd7e3f14e070ee0a7404d0187c75ff7cabbff
font_01_sfnt_off00011a74.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A74 10256 bytes
SHA-256: f74df7d82f42e7c5c9927c314b3b98e86d7f57e79a8ed2a75576cf3181d52c5b
font_02_sfnt_off0001311b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1311B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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