Malicious PDF — malware analysis report

Static analysis result for SHA-256 2c3bd75d5b95ade3…

MALICIOUS

PDF

92.2 KB Created: 2021-06-29 06:59:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 0811d34c6cd30eefcf4e5a96e57b2e95 SHA-1: b01f0de981f4adbf34f1281debc2782be8616206 SHA-256: 2c3bd75d5b95ade37c36394271486138a7b51b7ee49b4cbd3a24ebb0fd9e4d40
104 Risk Score

Malware Insights

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

The PDF document contains numerous links to compromised WordPress sites and other domains, suggesting an attempt to host and distribute malicious files. The presence of a 'download button' heuristic further supports the lure-based attack pattern. The ML classifier strongly indicates malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

Heuristics 6

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://crysiq.ru/uplcv?utm_term=happy+birthday+bubble+letters
    • https://shayangroup.net/wp-content/plugins/super-forms/uploads/php/files/10eead4e4ff9ec732bd36f26c9c498cc/givebemosozevu.pdf
    • https://oncetrabzon.com/resimler/files/zoluv.pdf
    • http://escolacaritas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160767901d7e1d---tevaxuwogogivuwawibovus.pdf
    • http://trans-serwis.com/userfiles/file/fawofu.pdf
    • http://donateagift.eu/userfiles/file/mopitame.pdf
    • http://mega.kz/media/upload/files/xenev.pdf
    • https://dineflon.com//files/nefibaputamixuwulez.pdf
    • https://trunglamdecor.com/uploads/userfiles/file/kivijeputegaveve.pdf
    • http://quickvideo.nl/userfiles/file/43739796897.pdf
    • https://theelementrama9.com/userfiles/files/ladowebemekazuto.pdf
    • http://www.garriagricola.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac80fa69310---98790288602.pdf
    • https://cffcommunications.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/160b310cd6ec7f---40334223365.pdf
    • http://icltindia.in/userfiles/file/77253703840.pdf
    • https://www.hontoys.com.au/wp-content/plugins/super-forms/uploads/php/files/9b52jkvrjjibjuruah0a54d6tc/28970234570.pdf
    • http://victorylimo1.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607814d78358b---29768130472.pdf
    • http://amwordpress.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607145fc7ec59---rukifufejeviwexuj.pdf
    • https://www.elementstraining.co.uk/wp-content/plugins/super-forms/uploads/php/files/4uotfd6raumrkq8q557i86bu48/53434672530.pdf
    • http://theopenhouseclub.com/wp-content/plugins/super-forms/uploads/php/files/8a22576f7b3dcf659f66ee03ffa96cde/mujimaroretigekivobaxa.pdf
    • http://xn--dlek-5qa.com/admin/UserFiles/file/mevolumoruxipupapi.pdf
    • https://hsegroup.ru/wp-content/plugins/super-forms/uploads/php/files/pqf4j3h6o4knelvt36i6097gi5/doxojesif.pdf
    • https://jerseyshorepirates.com/userfiles/files/54635585109.pdf
    • https://ladychief.com/wp-content/plugins/super-forms/uploads/php/files/9005a0b7abf8037365c4cd87a7a2a1c6/62056615519.pdf
    • https://benqmusicworkshop.com/fupload/file/giguminila.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000102c0.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x102C0 16792 bytes
font_01_sfnt_off00011ad7.bin
262ecd0c2eb67b41ce051bfb62d6ccadd689157a9bf104480d319023b8088377
pdf-font-stream PDF embedded font (sfnt) at offset 0x11AD7 10612 bytes
font_02_sfnt_off000132f7.bin
b99b06e82d597f89f1056d7a792e3879739f9679fc8986ee90e180a927734b56
pdf-font-stream PDF embedded font (sfnt) at offset 0x132F7 17952 bytes