Malicious PDF — malware analysis report

Static analysis result for SHA-256 fde9a7e41e1ccac4…

MALICIOUS

PDF

84.5 KB Created: 2021-08-30 03:22:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 98146bc7acd547b163e2bcb94d5a6d36 SHA-1: c288202172d1c68490bad559e29ed171d129e769 SHA-256: fde9a7e41e1ccac478b8d30d86c4b5dc04ec690d9569461236253cd91d438c90
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains embedded JavaScript and a significant number of external URIs, many of which point to compromised CMS uploads or are part of a link farm on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to phishing sites or download further malicious content. The embedded JavaScript is likely used to facilitate these redirects or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9679

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
  • PDF differential parser failed info PDF_DIFFERENTIAL_PARSE_FAILED
    The cross-check parser (pdfminer.six) failed on this file: PDF differential parser failed: PDFSyntaxError. Static heuristics still ran and any of their findings above are valid; only the differential cross-check signal is missing.
  • 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://drafthe.ru/uplcv?utm_term=full+time+manager+jobs+near+me
    • http://brandnewgoods.net/userfiles/file/texewuzorudotajojumobid.pdf
    • https://www.idromeccanicasrl.com/idromeccanicasrl.com/wp-content/plugins/super-forms/uploads/php/files/d8f045e4a7d19a0ef9ee5585faf1663c/12174916871.pdf
    • http://caacoding.net/wp-content/plugins/formcraft/file-upload/server/content/files/1612bf21da5868---xorotakezilatelekawo.pdf
    • https://inchiriereelicoptere.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1612b045328980---66190359564.pdf
    • http://baodieptailor.com/uploads/2021-06-16/images/files/panevo.pdf
    • http://solee56.com/ckfinder/userfiles/files/40778830059.pdf
    • http://www.highlandmetals.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1607016bc2f929---11524486441.pdf
    • https://microfocus-realize2020mea.com/wp-content/plugins/super-forms/uploads/php/files/ac337fa22d4cb8804c7c64880c74d7d6/83129623702.pdf
    • http://poorclarescork.ie/images/8578277728.pdf
    • https://eastmangroup.org/ckfinder/userfiles/files/57840655915.pdf
    • http://vamaconsulting.sk/userfiles/file/8664042409.pdf
    • http://goodwynva.com/clients/d/de/de91e19d235d8a3764238851c6b73f99/File/vatapiwub.pdf
    • http://www.mediacomriccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/160d01455bb0b4---89945465327.pdf
    • https://aquaprosmart.com/userfiles/files/13718267632.pdf
    • https://fortlauderdale-carservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160777131bd826---moxafuzutavozup.pdf
    • https://aduanaldelvalle.com/userfiles/file/zezagufuxawix.pdf
    • https://fiambreszav.com/wp-content/plugins/super-forms/uploads/php/files/d8657e99b45607714ae457cb7e27a302/13258712696.pdf
    • http://docando.es/js/ckfinder/userfiles/files/mawati.pdf
    • https://alphacleanwashing.com/wp-content/plugins/super-forms/uploads/php/files/ca2baa14b298ba3331ef6bf3727c7516/65529293131.pdf
    • http://nuraski.pl/wsg/userfiles/rumidejefabagalerawe.pdf
    • https://www.tctnanotech.com/wp-content/plugins/super-forms/uploads/php/files/e2d2a1959ee1540e8ed9c4f944f00d09/7180020313.pdf
    • http://lavera.it/wp-content/plugins/formcraft/file-upload/server/content/files/160bee61b84cc5---84590374943.pdf
    • http://spielundlicht.de/content_provider/documents/files/kufagena.pdf
    • http://laconchigliacasevacanze.it/userfiles/files/6972273189.pdf
    • 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_off0000ee8a.bin
1e6c572ea67fdb929bebde644ab16faa7107c4dc612b7c5dc4e15d0b0ecf0d92
pdf-font-stream PDF embedded font (sfnt) at offset 0xEE8A 10796 bytes
font_01_sfnt_off00010758.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10758 16792 bytes
font_02_sfnt_off00011f6a.bin
3cf6d84360d3b4ee666f5b38be3da178f7d49f7bc32f81a3a99ddcb6e28ca2ed
pdf-font-stream PDF embedded font (sfnt) at offset 0x11F6A 17748 bytes