Malicious PDF — malware analysis report

Static analysis result for SHA-256 d57705cfcc339b3a…

MALICIOUS

PDF

93.3 KB Created: 2021-06-26 14:01:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 8eb777798e6678c79cd4dd3e155ecb8e SHA-1: 9e7335a5782abf4b3248bac3676b7b54f3db9023 SHA-256: d57705cfcc339b3ac23ad50230d772149c69ae0cc276ff1404baf89d96da4c13
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF contains embedded JavaScript and a significant number of external URIs, many of which point to compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. The embedded JavaScript is likely used to obfuscate the malicious links or perform further actions upon opening.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9927

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://ketchas.ru/uplcv?utm_term=the+fifth+beatle
    • https://growlocals.com/wp-content/plugins/super-forms/uploads/php/files/9d33aca55993587aa358786f8f792f23/muwujopewunagiv.pdf
    • https://www.asahinadigital.com/wp-content/plugins/super-forms/uploads/php/files/gi3dtr3v6neisf9djmshm1bfms/zesalazemav.pdf
    • https://ewms.vn/wp-content/plugins/super-forms/uploads/php/files/78ugrqkab45v13710v4776cmgv/mafeved.pdf
    • https://www.lindopoint.it/wp-content/plugins/super-forms/uploads/php/files/6d90ead4b7ce16b1938458d92c628b1c/54990107886.pdf
    • https://sidexsideaudio.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c04255d973---resewemabod.pdf
    • http://vdgairconditioning.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a663e8ea645---mojure.pdf
    • https://www.webplease.it/wp-content/plugins/super-forms/uploads/php/files/i32bp8oncbs69iafg792ro35hg/lubomok.pdf
    • http://tamker.hu/userfiles/file/fapizonojipinatopu.pdf
    • https://goez3.com/10005001208290177/ckfinder/userfiles/files/47831941862.pdf
    • http://udmvdpo.ru/images/files/80185051599.pdf
    • http://arserwood.com/js/fckeditor/editor/filemanager/connectors/php/connector.php/upfiles/file/2106041952417073627fj5ey.pdf
    • https://shared401k.com/wp-content/plugins/super-forms/uploads/php/files/4a7a33b38f3bafdd2b48b8d7a730563d/kimenubumesebukagamov.pdf
    • http://viaterrestre.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606d0bd6e1c9f---78529259729.pdf
    • http://frigotechreina.com/userfiles/files/32113651674.pdf
    • http://khanaphatgroup.com/UserFiles/file/4269888810.pdf
    • https://www.ideaklinik.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077c57ef3d2c---40125866069.pdf
    • https://dreamscapes.ca/dream_scapes/userfiles/files/dibugeparosobupoketirowam.pdf
    • http://makaeximworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/160910806bcaa2---24943849582.pdf
    • http://bjjiffy.com/upload/10649007986.pdf
    • https://expungemyrecordnj.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a44539b2a70---22439512428.pdf
    • https://wpsqld.com.au/wp-content/plugins/super-forms/uploads/php/files/4c9ed17e57d2b63c5accc230f427aaf7/72658827730.pdf
    • http://carszana.com/image/upload/File/99223602715.pdf
    • https://freedomtampons.com/wp-content/plugins/super-forms/uploads/php/files/1fafbb3c2868ae6b5964b47ccb66fd74/jasukegubekebiderebamonib.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f015.bin
1adfdddbbb539b0357353100cc3c20d9fc7da8e1a4c891c1fb18d1067060dfa8
pdf-font-stream PDF embedded font (sfnt) at offset 0xF015 9920 bytes
font_01_sfnt_off00010618.bin
240635121dc16e7bc210c3fa4898b3d4ea6c622a5ae46ce0f8aa9ee0819a976a
pdf-font-stream PDF embedded font (sfnt) at offset 0x10618 19120 bytes
font_02_sfnt_off000138b0.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x138B0 16792 bytes
font_03_sfnt_off000150c1.bin
fd494554c7a7a2c4488382a78096c535ff133766c7221992be4f6a58596b2467
pdf-font-stream PDF embedded font (sfnt) at offset 0x150C1 16164 bytes