Malicious PDF — malware analysis report

Static analysis result for SHA-256 7fc8abd51e449f8c…

MALICIOUS

PDF

86.1 KB Created: 2021-06-30 11:43:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 5095e5f1f0da48821fdd34d1e3b52485 SHA-1: 8ec0f8ac6342d5930af84c63dfdaa46f91b01486 SHA-256: 7fc8abd51e449f8ceaf01219efbc606bde4670e4cc505141b20d4ab93e5a3305
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous links, many pointing to compromised WordPress sites, suggesting a phishing or redirection attempt. The presence of link farms on disposable hosting and the use of compromised CMS upload storage indicate a pattern of distributing malicious content through deceptive links. No scripts were extracted, but the overall structure and URL patterns are consistent with phishing lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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 https://intelean.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2f8095900d---37407906028.pdf
    • https://topplene.com/upload/ckfinder_temp/files/20210614001956.pdf
    • https://alllegaltask.com/wp-content/plugins/super-forms/uploads/php/files/sjbhkl4k99aocsornemkk7jmrk/jaselu.pdf
    • http://www.adanakursmerkezi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080223145354---xitusorilawonovufojawap.pdf
    • https://beautifullifeuk.com/wp-content/plugins/super-forms/uploads/php/files/b9eafdec9b427db68bc96ac584c7e9cc/11353544323.pdf
    • http://theydeserveastamp.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608725e88e1c9---41476721952.pdf
    • https://growlocals.com/wp-content/plugins/super-forms/uploads/php/files/c98b80f117dcaacc153496262005590b/sududesivefib.pdf
    • https://selectwifi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa9bfc6c30e---36995778418.pdf
    • http://dmn.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160734478eb09e---vikebelo.pdf
    • https://www.democratum.com/wp-content/plugins/super-forms/uploads/php/files/6aca73e6311e7595a9eaf05b5fb96785/44622050839.pdf
    • http://vudafrique.com/wp-content/plugins/super-forms/uploads/php/files/3a5e804a61eb7d64a1877df4936d26c2/76131699217.pdf
    • https://www.chortho.co.uk/wp-content/plugins/super-forms/uploads/php/files/rqohmsdhfbr5eo0p43c03opcp9/wajipumad.pdf
    • http://eszixv.hu/ckfinder/userfiles/files/jilugobisevawoxubulago.pdf
    • http://www.northeastmarquees.com/wp-content/plugins/super-forms/uploads/php/files/1f7f6537976528401f211f3005762ff9/72823781926.pdf
    • http://polskienarty.pl/data/aktualnosci_imgs/file/zuzokasaduwat.pdf
    • http://bmcnx.com/userfiles/file/mosonixojaxezekodatunataj.pdf
    • http://gostium.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608cc04302933---wafikuzodotujipexuxusubod.pdf
    • http://cetinelektrik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160a2163413d7c---rezavilotopusesabajan.pdf
    • https://afayl.com/userfiles/file/vudebixo.pdf
    • http://dabaizhongxue.com/upload_fck/file/2021-6-28/20210628125520483231.pdf
    • http://doo-san.com/userfiles/file/20210608045955.pdf
    • http://songhandiban.com/uploadfile/file/2021062110215273499.pdf
    • http://3handseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b38d48b3189---zuxalomoruxexatubolojo.pdf
    • http://pck.malopolska.pl/wp-content/plugins/super-forms/uploads/php/files/e6e8f411370e3415cb2d99935cc77da0/gobojajovojul.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=describe+any+five+features+of+democracy
    • 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_off0000edd9.bin
c4e0afea839b92234e276aa85e061aca767f1095a57ab549a8a84f6fd5b405e4
pdf-font-stream PDF embedded font (sfnt) at offset 0xEDD9 16820 bytes
font_01_sfnt_off00011941.bin
e1cbdaeb307341a339f20cfe3f2435290f7666ae9dd98def59db57225abb0b33
pdf-font-stream PDF embedded font (sfnt) at offset 0x11941 11012 bytes
font_02_sfnt_off000132f0.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x132F0 16792 bytes