Malicious PDF — malware analysis report

Static analysis result for SHA-256 e2e448823c66e0e7…

MALICIOUS

PDF

76.1 KB Created: 2021-09-02 22:43:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 4b2cf140dbe369936a175c0e338171ee SHA-1: d1ef26ec43bccb6c4ed29eda9eeb3d53c46c2cac SHA-256: e2e448823c66e0e7024bc615e6eb69b7e24267d0b44ea40685b41649bacb1150
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript, which is a common technique for executing malicious code. It also features a large number of external URLs, many hosted on compromised WordPress sites, suggesting a phishing or malware distribution campaign. The ClamAV detection and ML classifier further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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
  • 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://queure.ru/uplcv?utm_term=sphygmomanometer+manual+pdf PDF link annotation
    • http://razzledazzleevents.in/userfiles/file/13067044004.pdfIn PDF document text
    • http://localhomesales.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16073c8c288f34---judugewokalaxorikokelos.pdfIn PDF document text
    • https://aokman-drive.com/d/files/depojogu.pdfIn PDF document text
    • https://www.inkfactory.pk/wp-content/plugins/formcraft/file-upload/server/content/files/160aa2e2f41923---janexevojo.pdfIn PDF document text
    • https://www.msolartop.cz/wp-content/plugins/formcraft/file-upload/server/content/files/160c96cb229c95---65478025375.pdfIn PDF document text
    • http://www.immiflex.com/wp-content/plugins/formcraft/file-upload/server/content/files/16103f607c35aa---vebef.pdfIn PDF document text
    • https://www.funes.gob.ar/ckfinder/userfiles/files/nasovijetunexesiw.pdfIn PDF document text
    • http://limpiasol.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c86dcc28a2---24855978086.pdfIn PDF document text
    • http://rufullthrottle.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087db28cfd07---87846421769.pdfIn PDF document text
    • http://gentlemensquartersbarbershop.com/wp-content/plugins/super-forms/uploads/php/files/01e8451240d19407127a3fee2dbbc15f/62783630327.pdfIn PDF document text
    • https://swalaya.in/userfiles/file/45164703914.pdfIn PDF document text
    • http://autodilykanka.cz/cmsimple/images/file/87057392873.pdfIn PDF document text
    • http://www.lavalledesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d5604320e7---pusutofepar.pdfIn PDF document text
    • https://marciasmithconsulting.com/wp-content/plugins/super-forms/uploads/php/files/37e5a98d5176285ab1f93e47a6bf009b/41101770917.pdfIn PDF document text
    • https://niboparis.com/upload/fckeditor/files/20253119641.pdfIn PDF document text
    • https://fitnessrev.net/wp-content/plugins/super-forms/uploads/php/files/rcsi3f51vf76dsich45kn62eji/sadasepowelisifupaso.pdfIn PDF document text
    • http://nickels.design/ckfinder/userfiles/files/93046861082.pdfIn PDF document text
    • https://naseeha.org/wp-content/plugins/super-forms/uploads/php/files/2743971972ac7d63216fbd4b880aabe3/92862249034.pdfIn PDF document text
    • https://tonitomov.com/picture/file/73182248248.pdfIn PDF document text
    • https://valergences.fr/userfiles/file/vuwegawewuzekuwe.pdfIn PDF document text
    • https://imahima.xyz/js/ckfinder/userfiles/files/zurezori.pdfIn PDF document text
    • http://nuovojob.com/userfiles/files/91473093146.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_off0000c25a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC25A 18152 bytes
SHA-256: e21a7be80448875159058d1aaaf1d4b0fdc3b3dc96e0e1ace14f83109f1f874f
font_01_sfnt_off0000f1c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1C4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000109db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109DB 10976 bytes
SHA-256: fc01e9a502c9762efab3f24dac4afc503c5f67ffbddcbbbd783a2c5297d3fb9e

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