Malicious PDF — malware analysis report

Static analysis result for SHA-256 9de65b60dc3c47ce…

MALICIOUS

PDF

99.7 KB Created: 2021-06-28 23:27:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: c8a07292041685d3935145f118156497 SHA-1: fb7b6f6bf92a9011390e3f0ad62030820e9c1d1e SHA-256: 9de65b60dc3c47ce7a1e372827d273bb38be2ed4b2a3c1d24172755ab20dd42e
164 Risk Score

Malware Insights

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

This PDF was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains a link farm pointing to compromised WordPress upload storage, suggesting an attempt to host malicious files. The presence of a 'download button' lure further supports a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9936

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://www.medicalalliedtraining.com/wp-content/plugins/formcraft/file-upload/server/content/files/160779a98ecf5c---mezifirad.pdf
    • https://www.treehousecare.org/wp-content/plugins/formcraft/file-upload/server/content/files/16070eae3c81ef---nideroginimeriwivebogigo.pdf
    • https://www.entornopublicitario.com/wp-content/plugins/super-forms/uploads/php/files/1f3d65dfb0b15b2c3acb75064b20ad41/49051245425.pdf
    • http://www.gcsystem.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160847e49ba8be---temazubobidaxe.pdf
    • http://dragonera.cn/admin/userfiles/file/supexibelivilakekusu.pdf
    • http://citra.cl/userfiles/file/kebigumebekepulovuzep.pdf
    • http://kaplanpm.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a467e8114f0---bawixuvirufazijomubefamub.pdf
    • http://barrarioservicos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160ab928c00ac2---namejevuwadovopa.pdf
    • https://alignerco.com/wp-content/plugins/super-forms/uploads/php/files/4ff1c74c43e698b35e1a06b52570c537/vikedatirofupozal.pdf
    • https://tonitomov.com/picture/file/rorazodenisajelafubigon.pdf
    • http://bannermaul.com/userData/board/file/torusatitesonopi.pdf
    • http://changwontour.kr/FileData/ckfinder/files/20210616_8389264086031929.pdf
    • https://ncfouting.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a9176c7878---37682289789.pdf
    • https://www.cfo-search.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092f71702eb7---virusab.pdf
    • https://mygoaltv.org/ipp/images/uploads/files/pifigojudikerekin.pdf
    • http://ruilong-ironwork.com/CKEdit/upload/files/28189764711.pdf
    • https://aymsoft.us/aym_image/files/56946856175.pdf
    • http://xn--b1ahhafccpgkb2bxo.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/221c144d355eea885dd5e1c0cc8a933a/83112387846.pdf
    • http://amfmeg.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a5743c4caf1---tepajaveresurodifinabeje.pdf
    • https://neavocats.com/wp-content/plugins/super-forms/uploads/php/files/d1286198cd396bc562e96dce8672377f/pemiripel.pdf
    • https://voicelux.ru/wp-content/plugins/super-forms/uploads/php/files/0075f7d87ea926a7d910b67eb50821ca/voxipixixadojororajewajev.pdf
    • http://stark-tools.ru/images/uploaded/92547437489.pdf
    • http://asbu.net/uploads/FCK_files/file/xamev.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=outlook+web+app+sign+up
    • 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_off00012199.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12199 16792 bytes
font_01_sfnt_off000139ab.bin
911bdf4f6199218b3ce819e2f0c8dab49057046dd1b120824b064c0343e0b611		 pdf-font-stream PDF embedded font (sfnt) at offset 0x139AB 17980 bytes
font_02_sfnt_off00016911.bin
8c97abf6181cc9d2f0b516ad2ef87385246f7d93acc9091ed4b3227d13443040		 pdf-font-stream PDF embedded font (sfnt) at offset 0x16911 10768 bytes

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