Malicious PDF — malware analysis report

Static analysis result for SHA-256 a282388023340caf…

MALICIOUS

PDF

83.4 KB Created: 2021-09-07 14:32:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 28a146d24d69b10d9f2ebedbdd7cdc75 SHA-1: bd3962f282809df672af5ddb456f5aa20f11dbab SHA-256: a282388023340caf1322007ecfd5ea07830f41d7c60c82ffc247fb043b991629
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains embedded JavaScript, which is often used to redirect users to malicious websites. Several heuristics indicate the presence of link farms pointing to compromised WordPress sites and disposable hosting, suggesting a phishing or malware distribution scheme. The ClamAV detection and ML classifier strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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.
  • JavaScript action low PDF_JAVASCRIPT
    PDF contains a /JavaScript action. 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 https://allytemp.ru/uplcv?utm_term=understanding+insurance+law+pdf PDF link annotation
    • https://nscs.org/wp-content/plugins/super-forms/uploads/php/files/4caddbcfbf3e906e1b3af5f6f84d6eef/vodiponifeputojijotovid.pdfIn PDF document text
    • http://mastrodibaglio.it/userfiles/files/gozubofofizoxokenu.pdfIn PDF document text
    • http://xn--tnqz8hz5cb8l.com/upload/files/puvugudovogunadijo.pdfIn PDF document text
    • https://www.bouwenaaneensterkwerkgeversmerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609b50fc55673---xugaperuse.pdfIn PDF document text
    • https://rarahil.org.np/ckfinder/userfiles/files/jomesojedidiworoboxix.pdfIn PDF document text
    • https://xlux.vn/wp-content/plugins/super-forms/uploads/php/files/utjsanr09upnogrtrp0uogc380/11811560726.pdfIn PDF document text
    • http://www.siscbolivia.com/admin/uploaded/fck/file/64007421443.pdfIn PDF document text
    • http://lowry-averyreunion.com/clients/c/c0/c0e4e7922159a76f956c19110b7bfeb7/File/28635026303.pdfIn PDF document text
    • https://bizdrive.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/160892b034e6ed---sixotosof.pdfIn PDF document text
    • http://csim.jp/ckeditor/uploads/files/64163275942.pdfIn PDF document text
    • https://laznia-radom.pl/userfiles/file/mabemux.pdfIn PDF document text
    • http://caribsplash.org/wp-content/plugins/formcraft/file-upload/server/content/files/160733b3d144f1---45739892181.pdfIn PDF document text
    • http://takeacode.net/user/d41d8cd98f00b204e9800998ecf8427e/file/futago.pdfIn PDF document text
    • https://alajuusa.eemedia/contents/file/994641607.pdfIn PDF document text
    • https://jasz-pap.hu/UserFiles/file/56437893544.pdfIn PDF document text
    • https://preciseenergygroup.com/media/75041935403.pdfIn PDF document text
    • http://ekogamma.pl/javascript/ckfinder/userfiles/files/18815019890.pdfIn PDF document text
    • https://primax.fr/wp-content/plugins/super-forms/uploads/php/files/8q21vp0ktnaim645bjlk45tvd3/jetujuzipuvoritagalasefo.pdfIn PDF document text
    • http://market-oborudovanie.ru/upload/file/rutaganefigem.pdfIn PDF document text
    • https://aquariumfargo.com/wp-content/plugins/super-forms/uploads/php/files/23d564a88788118d5170f01679b2df6b/xuzere.pdfIn PDF document text
    • http://pogologistics.com/ckfinder/userfiles/files/70204244141.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e11c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE11C 10868 bytes
SHA-256: f16206c02b5995169cd9e124896f5b5fb9bab25c6d585d01d62481394b919131
font_01_sfnt_off0000fa2b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA2B 17964 bytes
SHA-256: 558ab954b8f199e04d22ebd99c39721b2539b65fcd4b3c4dde4404809421fb07
font_02_sfnt_off00012838.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12838 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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