Malicious PDF — malware analysis report

Static analysis result for SHA-256 d2fdd9c8de37b375…

MALICIOUS

PDF

100.3 KB Created: 2021-08-25 14:48:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: f0bfdc151fcbfb43cc3b8cec33eb672c SHA-1: 85c98b6a11649518fe3b8e127ae5110fcf4514bf SHA-256: d2fdd9c8de37b3752f9bd286b96b49513fd7fde0af1e999147be3a0057d31b64
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a link farm pointing to multiple compromised CMS upload directories, indicating an attempt to host malicious content. Heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' strongly suggest this is a phishing or redirection lure. The ML classifier and ClamAV detection further confirm its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9979

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://actioncoach.com.my/wp-content/plugins/formcraft/file-upload/server/content/files/1608e17ad806ab---69257809643.pdf In PDF document text
    • http://irk-yoga.ru/upload/files/32207254263.pdfIn PDF document text
    • https://novitas.ro/files/lirogekogasarurol.pdfIn PDF document text
    • http://aksaaydinlatma.com/img/editor/image/file/32258900083.pdfIn PDF document text
    • http://funkyspa.net/ckfinder/userfiles/files/gomudejobo.pdfIn PDF document text
    • http://azizavacanze.com/userfiles/files/46792902810.pdfIn PDF document text
    • http://preserveproperties.com/userfiles/files/dawosanip.pdfIn PDF document text
    • http://www.nowsingapore.co.id/wp-content/plugins/formcraft/file-upload/server/content/files/16074fa30a0990---dinunuvivifokogupiruwovu.pdfIn PDF document text
    • http://sjhrz.com/images/upload/File/kalufijofebanide.pdfIn PDF document text
    • http://www.gabrielamaciel.net/images/content/file/gipadolijowutemuwazatum.pdfIn PDF document text
    • https://www.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/161156367bf02e---jidenerawejosofurapovepa.pdfIn PDF document text
    • http://benardoutlite.com/admin/fckeditor/fckdata/file/4276264210.pdfIn PDF document text
    • https://mymovingestimate.com/wp-content/plugins/super-forms/uploads/php/files/26fc6938e9674c4a731b3d6d4b54aabc/wufajejegadorubeki.pdfIn PDF document text
    • http://oldtimerclub-thueringerberg.at/images/file/jikavoxani.pdfIn PDF document text
    • https://digireg.ru/upload/mataxaxoxupunoruwaze.pdfIn PDF document text
    • https://trsbarriersdirect.com/wp-content/plugins/super-forms/uploads/php/files/0deirv0s0e8pvlfis8s8m23bhu/zuzoranadalib.pdfIn PDF document text
    • https://outsourcedbackoffice.co.uk/wp-content/plugins/super-forms/uploads/php/files/54472733278bf41149ed168736e260bf/topusunokejevor.pdfIn PDF document text
    • https://swift-tw.com/lcc/upload/files/39225615564.pdfIn PDF document text
    • http://cnmrobotics.com/files/files/gaxakiz.pdfIn PDF document text
    • http://kindervakantieweekdeurne.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a9b08c18b6c---pukimawiraxumegifefi.pdfIn PDF document text
    • https://dollarplus98.com/images/upload/files/vigelemizelimemigituf.pdfIn PDF document text
    • http://goddesshair.net/upload/users/files/72670860462.pdfIn PDF document text
    • https://1877painters.com/FCKeditor/file/74012433677.pdfIn PDF document text
    • http://muzeumostrowiec.pl/obrazy/file/wetanarimesejokomizud.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=what+is+an+sds+forPDF link annotation
    • 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_off0001275b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1275B 10264 bytes
SHA-256: 9caa02f9752d5ec320c0c2a415e21525cd9582df9c0cc1686885b3dc5f6a495a
font_01_sfnt_off00013e5b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E5B 16972 bytes
SHA-256: 7426c86411094abc1136b43bd6f1a9df9e6eb59980dd8fc17778b7e0fe9fd999
font_02_sfnt_off00016ab4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16AB4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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