Malicious PDF — malware analysis report

Static analysis result for SHA-256 9bf09920158b1772…

MALICIOUS

PDF

100.0 KB Created: 2021-07-18 08:27:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 1099c575389166be5ca9879e5472ca67 SHA-1: bf336cdec6a2e034027c830389961eca3f20c9b6 SHA-256: 9bf09920158b1772b80f1f5e3b948e4b703b91226dbe29a61cc6173c8a6b7612
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to potentially compromised websites, indicated by heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM'. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. While no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a malicious campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9936

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 http://brothersaluminium.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/16088831351806---36529166214.pdf In PDF document text
    • https://rmp-traueranzeigen.de/cms/files/bisepidigovozo.pdfIn PDF document text
    • http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/pohdmj7d5nl52nsggc91aasof7/bixobewofawimo.pdfIn PDF document text
    • http://www.zywawiara.pl/pliki/masagajoziwu.pdfIn PDF document text
    • http://premiumresourcing.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079adb732dd0---62767942113.pdfIn PDF document text
    • https://www.asahinafunnels.com/wp-content/plugins/super-forms/uploads/php/files/o70o0620mk1vghiiurefl403pm/govaduduzizetaxerut.pdfIn PDF document text
    • https://abugfreemind.com/userfiles/file/datezilufalon.pdfIn PDF document text
    • https://gmonlinestore.com/wp-content/plugins/formcraft/file-upload/server/content/files/160759d0899a9e---xozisipejo.pdfIn PDF document text
    • https://solo-enoant.com/content/files/files/14493213131.pdfIn PDF document text
    • http://albatrossmrn.com/konadnew/userfiles/file/pukunuvofewaveg.pdfIn PDF document text
    • https://bonpetsupply.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e138e72953---sebedudesovejesupoxabopur.pdfIn PDF document text
    • https://www.aserspa.net/wp-content/plugins/super-forms/uploads/php/files/ehj9f6ubiqea5ku084k0t5hp24/18157794664.pdfIn PDF document text
    • https://couvreur-hautdoubs.fr/internet_new/images_et_fichiers//file/nowibasovufibuxi.pdfIn PDF document text
    • http://www.socalgreatwhite.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094921bd138b---7206758428.pdfIn PDF document text
    • http://saamfactory.com/wp-content/plugins/super-forms/uploads/php/files/6920d7b33cb755459f765ca15c262783/54627466079.pdfIn PDF document text
    • http://fixafilm.se/userfiles/file/85109881006.pdfIn PDF document text
    • https://minutesnap.com/wp-content/plugins/super-forms/uploads/php/files/e9e3d77677d1f6f2e4ccbc32d09081e2/botemavikat.pdfIn PDF document text
    • http://alwaysfavorentertainment.com/clients/879371/File/72779843338.pdfIn PDF document text
    • https://newtech-utm.pl/userfiles/file/vazopawejejasu.pdfIn PDF document text
    • https://rotitelor.com/contents//files/23396770133.pdfIn PDF document text
    • http://marthomaiticherukole.com/userfiles/file/zavizibixiwajakogo.pdfIn PDF document text
    • https://psychotherapie-dr-albrecht.de/wp-content/plugins/formcraft/file-upload/server/content/files/16086e8f16434c---57151967146.pdfIn PDF document text
    • http://ibtaker.ps/userfiles/file/bemifafosujosuwig.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=introduction+to+the+art+of+programming+using+scalaPDF 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_off00011fc3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FC3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000137d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x137D5 17936 bytes
SHA-256: a4e3030301311e55dc66e7e0097c4305b02e809e14b8ae87925be5dc5c898c03
font_02_sfnt_off0001672f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1672F 11120 bytes
SHA-256: df259174b32bc160a43d9e279206f35f54dfbecdfb4adc2cf4238b37fe55e501

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