Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f3880ff22b96ae7…

MALICIOUS

PDF

74.3 KB Created: 2021-06-28 01:25:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: f85c5644320ac18e6c06df79e8556a3f SHA-1: 25b729ec637431adce1c7c98e35477d50acb2283 SHA-256: 8f3880ff22b96ae7fbc68ed05e94c7901da33687d99c0850da44c493402c4c83
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links pointing to compromised WordPress sites, acting as a link farm. These links likely lead to further malicious content or phishing pages, aiming to deceive the user into downloading a payload or divulging sensitive information.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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 http://for-rent-aalst.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607027650b4a4---2741458625.pdf In PDF document text
    • https://kachhiproperties.com/wp-content/plugins/super-forms/uploads/php/files/t7bbe0lnj2rqelr70m232kf5b6/jidirubifimapek.pdfIn PDF document text
    • http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/htrd3rbp91meuj30mdfssuelp2/lutiporupam.pdfIn PDF document text
    • https://carthink.org/wp-content/plugins/formcraft/file-upload/server/content/files/1606d9b14c80cf---26104807930.pdfIn PDF document text
    • https://twr1115.net/files/fckeditor/file/72583333516.pdfIn PDF document text
    • http://caribsplash.org/wp-content/plugins/formcraft/file-upload/server/content/files/160bf436a552fb---leran.pdfIn PDF document text
    • http://alexanderkanevskyartgallery.com/clientMedia/file/rikadin.pdfIn PDF document text
    • http://www.catalogodecineargentino.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d5562f1291---luwadipidekakodavalot.pdfIn PDF document text
    • http://agcslohian.com/userfiles/file/sigatodebaxuzi.pdfIn PDF document text
    • https://beribuket.ru/wp-content/plugins/super-forms/uploads/php/files/94248b4250ce1f3f57d76babebe53a2a/4510299370.pdfIn PDF document text
    • http://slanfusa.org/clients/47225/File/50099246255.pdfIn PDF document text
    • http://chataphan.com/file_media/file_image/file/rimuzilogovok.pdfIn PDF document text
    • http://www.iamgoingto1996.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac3af886420---nusuluradokap.pdfIn PDF document text
    • http://absolutelyneon.com/userfiles/file/8278778018.pdfIn PDF document text
    • https://www.cedicar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160771c905a8bf---62632436396.pdfIn PDF document text
    • http://phenix-security.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16073cb6608f2e---32755067294.pdfIn PDF document text
    • https://www.geosuiteonline.de/wp-content/plugins/formcraft/file-upload/server/content/files/160bed07882ef5---gomekedukisavudedupamimuk.pdfIn PDF document text
    • https://xn--80aaa1anac6cg.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/344f19a987b0ed64c3e175664223a342/xoderenol.pdfIn PDF document text
    • https://ajitcoatings.com/uploads/1010319218.pdfIn PDF document text
    • http://ashioke.com/images/library/File/8492322165.pdfIn PDF document text
    • https://schreinerheusi.de/wp-content/plugins/formcraft/file-upload/server/content/files/160d5e6ee2a885---98108310571.pdfIn PDF document text
    • https://travelselection.us/wp-content/plugins/formcraft/file-upload/server/content/files/16072be38dc55c---jumojupaxozegazozamumoviv.pdfIn PDF document text
    • https://arenda1s.ru/wp-content/plugins/super-forms/uploads/php/files/286ef5156d4d34990b5638c4ff9b9e1c/4798761753.pdfIn PDF document text
    • http://www.brennholz-heinlein.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608ff4fc31d04---sojowu.pdfIn PDF document text
    • http://atut-biuro.com/uploaded/file/12795806822.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=never+ever+meaningPDF 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_off0000c388.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC388 10060 bytes
SHA-256: e2445f9b3ae61b5a0ef786fbbe95613a02cf14914cc488ea25c4b293caf80f47
font_01_sfnt_off0000d9d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9D7 17000 bytes
SHA-256: 17dbcd4803a9a1d493902957e12337439caf3fca76045701b307d4e53cd596df
font_02_sfnt_off0001042d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1042D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1