Malicious PDF — malware analysis report

Static analysis result for SHA-256 5c909b364228d57e…

MALICIOUS

PDF

82.3 KB Created: 2021-07-03 20:47:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: cfd2240ceb5a18fd6f6c5ebcf17d097e SHA-1: 184be789a8b1eb3f6a18cccc819ca6022f3a08df SHA-256: 5c909b364228d57edd5c134fb86d7b31d89203744b243e2af089a07a3e3f7f37
172 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier indicating maliciousness. It contains a link farm pointing to compromised WordPress uploads and disposable hosting, suggesting an attempt to distribute malicious content or phish users. The presence of embedded JavaScript further supports the likelihood of malicious activity, potentially for downloading additional payloads or redirecting users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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.
  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://sealordhotels.com/ckfinder/userfiles/files/26181867144.pdf
    • http://skyrunarser.com/js/fckeditor/editor/filemanager/connectors/php/connector.php/upfiles/file/210605203442400502jt16bl.pdf
    • https://www.cdscabling.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160d7db3cd9b92---26059405975.pdf
    • http://objetivovender.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cf8300d4cd6---13593910509.pdf
    • http://ty-universe.com/image/files/20210603_183122.pdf
    • https://b2cexpressdemo.com/userfiles/file/38812174321.pdf
    • http://mfplus.ba/wp-content/plugins/formcraft/file-upload/server/content/files/160a75b925b19b---4067185984.pdf
    • http://crystalnymph.by/wp-content/plugins/super-forms/uploads/php/files/fa7ca230b4d1106d7b1b4e8b5c8a3acb/xalojebiwimaxuv.pdf
    • http://cbelmira.com/wp-content/plugins/super-forms/uploads/php/files/2artmfrgogi72lvhr2i2t14df1/sovug.pdf
    • https://fastcomputer.vn/wp-content/plugins/super-forms/uploads/php/files/3d523fdbbb8cb216c0773f2f32aa2a0d/69912984659.pdf
    • https://eclipsetheaters.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9524fda704---63197874176.pdf
    • https://www.drserapkagan.com/wp-content/plugins/super-forms/uploads/php/files/mj9s2ncp78kq5s4eritn5np5hb/xabaxexawimazaxa.pdf
    • http://xn--9w3b11kh5l.com/ckupload/files/jajodobofufo.pdf
    • https://alfa-pechati.ru/wp-content/plugins/super-forms/uploads/php/files/37616d0999b5cd185af377a44d255103/40303858717.pdf
    • https://jagamimpi.net/contents//files/xikibej.pdf
    • https://kes-stv.ru/wp-content/plugins/super-forms/uploads/php/files/2b55f9a9a83620f109b7d943d33b3cae/pojoder.pdf
    • https://dvg.asia/ckfinder/uploadfiles/files/5954114513.pdf
    • https://www.mclarenpress.com/wp-content/plugins/formcraft/file-upload/server/content/files/160851fb7cf0ec---kegadezugefiletifi.pdf
    • https://donnasalon.ru/wp-content/plugins/super-forms/uploads/php/files/143259aafaafea3ea296dcb056c5530f/dojegati.pdf
    • https://westcoastmovers.ca/wp-content/plugins/super-forms/uploads/php/files/su0vpbvftehesmb1sqako5u86u/31038033626.pdf
    • https://t4g.nasscomfoundation.org/wp-content/plugins/super-forms/uploads/php/files/uqd3jmk69qnv3fjl9fvtqfr9f1/ziredobe.pdf
    • http://pck.malopolska.pl/wp-content/plugins/super-forms/uploads/php/files/2656a20dbf050ae91607876ed413c451/fipagokakowazikixidufoxiw.pdf
    • https://ecef-groupe.com/wp-content/plugins/super-forms/uploads/php/files/bd01phj3mccis72m5u529adar2/96454986531.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=autocad+drawing+convert+higher+version+to+lower+version
    • 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_off0000dde2.bin
befd46fa2c90800b579debde0e02e09b7a7a06f8b9b1cbfa59d8825bb4ca97cf
pdf-font-stream PDF embedded font (sfnt) at offset 0xDDE2 17020 bytes
font_01_sfnt_off00010a4e.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10A4E 16792 bytes
font_02_sfnt_off00012265.bin
e79849cf171b78c19592cc5cb0c35b33105b2549d384c7c4c2c51d6a4714dd99
pdf-font-stream PDF embedded font (sfnt) at offset 0x12265 10880 bytes