Malicious PDF — malware analysis report

Static analysis result for SHA-256 35568837020e44fe…

MALICIOUS

PDF

92.3 KB Created: 2021-08-12 23:54:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 8482985e5c36eac16b0c89b5b3f22884 SHA-1: a2c44a290536a12f70fc03cd25943aa10e3b1ca5 SHA-256: 35568837020e44fe1b9c17b0cfff8e00d7d4fbc49c4b851c8d56076b11f72133
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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.
  • 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 http://generale-bureautique.fr/gdb/files/file/57445673935.pdf
    • https://annekienlen.fr/imagesfile/76202023421.pdf
    • http://skyrunarser.com/js/fckeditor/editor/filemanager/connectors/php/connector.php/upfiles/file/210731040620511248vi57t5.pdf
    • https://oncetrabzon.com/resimler/files/rugurexisiviz.pdf
    • https://www.tifdip.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d1ce2624cf9---kuposovu.pdf
    • https://gachbinhduong.com/upload/file/gimibivojubusiz.pdf
    • http://nomorecpapmachine.com/userfiles/files/86376741653.pdf
    • http://graphicon.hu/wp-content/plugins/formcraft/file-upload/server/content/files/161074d7db210b---5667981475.pdf
    • http://training-solutions.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1608cbd8c1a8f5---87400590933.pdf
    • https://avenirpourtous.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160a8cf1f4467d---samiwetirejikix.pdf
    • http://studiotecnicoprato.eu/userfiles/files/nuvozupitososotusu.pdf
    • https://aedwea.com/upload/foto/64821477050.pdf
    • https://mytutr.com/wp-content/plugins/super-forms/uploads/php/files/3a7484ac35b5c3f85de92f1a1a7ac00f/30560319372.pdf
    • http://jmestateplanning.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/15552919327.pdf
    • https://www.colegiodesafio.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/160c1e3c64fe93---38150773460.pdf
    • http://ascensionchina.com/userfiles/file/16899302625.pdf
    • http://lhs1965.com/clients/880801/File/rikulujetupuwanewezo.pdf
    • http://moon-villa123.com/CKEdit/upload/files/55797546414.pdf
    • http://www.platformliften.info/wp-content/plugins/formcraft/file-upload/server/content/files/160b2c74f42d92---ruvuwudare.pdf
    • http://thuduchouse.vn/pics/file/bivotakozuxujereb.pdf
    • http://triumphtoday.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609ec53966681---75751756390.pdf
    • http://www.xpresswedding.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094297f97457---temusu.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=chess+horse+3d+model+free+download
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010577.bin
73d058433d945ff638b9978e3052c1d5477cc58caad65ca37ab019f339d6508a
pdf-font-stream PDF embedded font (sfnt) at offset 0x10577 10720 bytes
font_01_sfnt_off00011e0b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11E0B 16792 bytes
font_02_sfnt_off0001361d.bin
606ed5dd79b5a381c0350b199b12dade1f66d932edc66b36411a251eafbc3d40
pdf-font-stream PDF embedded font (sfnt) at offset 0x1361D 17588 bytes