Malicious PDF — malware analysis report

Static analysis result for SHA-256 7cc0a115b405f6cc…

MALICIOUS

PDF

86.2 KB Created: 2021-06-26 23:00:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 3c4b203c1cf78820f94c5fcbb15fa92d SHA-1: f93d552fe800101a86dea4d29c1ad530a7be6c95 SHA-256: 7cc0a115b405f6cc56642ce8e016ad228d9beaf9a8e93b95b7e614ff422a69a2
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains embedded JavaScript and multiple URLs pointing to compromised WordPress sites, indicating an attempt to redirect users to malicious content. The heuristic 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' strongly suggests these links are part of a malicious infrastructure designed to host or distribute further payloads. The ML classifier and ClamAV detection further support the malicious nature of this file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 7

  • 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.
  • 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 http://www.shipsupply.co.mz/wp-content/plugins/formcraft/file-upload/server/content/files/16084bdb47124b---tukavokapafubudazufo.pdf
    • http://thanhlamresort.vn/wp-content/plugins/formcraft/file-upload/server/content/files/160c3e5cfdbfd1---60857821072.pdf
    • https://vakukh.ru/wp-content/plugins/super-forms/uploads/php/files/9db80367eee9487af2f46573b94c2846/kujojizutap.pdf
    • http://matrixuniverzum.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160b08798179be---25408774008.pdf
    • https://heykidsletscook.info/wp-content/plugins/super-forms/uploads/php/files/82f98d3a9d8435feefee3c3c25cc319b/letotekewamebu.pdf
    • https://churchosonline.com/wp-content/plugins/super-forms/uploads/php/files/3af0264d10cec302a9bf9515d0aea8fe/36774097005.pdf
    • http://nassagroup.org/app/webroot/js/ckfinder/userfiles/files/falexokolax.pdf
    • http://perfekttorun.pl/pliki/ratokozonojetewomepe.pdf
    • https://criteriacambio.com.br/wp-content/plugins/super-forms/uploads/php/files/a222hj2q2d1p197r1ejid0ov03/40942295522.pdf
    • http://lawcab.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16079af2958e54---xitasesiverefetotuwelu.pdf
    • http://birnagarcollege.in/userfiles/file/fipugopolutozafexe.pdf
    • https://ktmcollege.org/public_html/userfiles/file/namozeripotofu.pdf
    • http://amfmeg.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b6813d98cac---11438017224.pdf
    • http://strahovka66.ru/userfiles/file/20303827972.pdf
    • http://autoscuolavalerio.it/userfiles/files/77114702495.pdf
    • http://elmiraclassiccountry.com/wp-content/plugins/super-forms/uploads/php/files/mg1lrvi3t8cvsprcv33k444b80/30572765986.pdf
    • http://emurus.jp/userfiles/file/85817877137.pdf
    • http://www.marcado.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160a4974818750---tumoseweza.pdf
    • http://www.goataxiservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e2f8264e0a---tijamuwuvoruwoxov.pdf
    • http://sarahscupcakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b2c78245c55---37074523643.pdf
    • https://rtvpuls.com/ckfinder/userfiles/files/23146136720.pdf
    • http://www.shipsupply.co.mz/wp-content/plugins/formcraft/file-upload/server/content/files/1609b0900d4548---67861731633.pdf
    • http://a-kamen.com/userfiles/file/11736474376.pdf
    • https://www.eziblank.com/wp-content/plugins/super-forms/uploads/php/files/efqae2rsdugkc7kai9cs11t2t6/wesufubut.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=do+you+have+to+have+two+guinea+pigs
    • 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_off0000ece1.bin
6a8236c50d28c715c536bc131a7cfba018136d0680dae24efca23ae61d12dcde
pdf-font-stream PDF embedded font (sfnt) at offset 0xECE1 16824 bytes
font_01_sfnt_off000118ce.bin
df49836eb4f5dab1a78c387566a49192467d1b67a46fa6df50ea23273b4b52c6
pdf-font-stream PDF embedded font (sfnt) at offset 0x118CE 10752 bytes
font_02_sfnt_off0001319e.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1319E 16792 bytes