Malicious PDF — malware analysis report

Static analysis result for SHA-256 d6e3dec1b01d3742…

MALICIOUS

PDF

85.9 KB Created: 2021-08-21 16:48:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 8aaf7de9383b966f90f4b359e09c865d SHA-1: 5b08349d718bc8ae1e1106d51d00d6b9f109d8ff SHA-256: d6e3dec1b01d3742e58169e9a50126ecaf7bd80656da816669268bb55c56d066
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as malicious by ClamAV and an ML classifier, and contains embedded JavaScript. It also exhibits characteristics of a link farm, with numerous URLs pointing to potentially compromised or disposable hosting, suggesting an attempt to obscure the final destination. The embedded JavaScript likely facilitates the redirection or execution of further malicious actions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://infrive.ru/uplcv?utm_term=sdi+polanight+reviews PDF link annotation
    • http://airconbank.com/upload/fckeditor/file/25571206517.pdfIn PDF document text
    • http://msci.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/1609b2dd13257a---nomezukodofexowixu.pdfIn PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/962sjf3phd3lj5ql64cto7ks5u/vunul.pdfIn PDF document text
    • https://bharatiyabhashaparishad.org/ckfinder/userfiles/files/24500770917.pdfIn PDF document text
    • http://gistfamilyreunion.com/clients/8/8c/8cbf0a40baaab9dd4734ff2cdbb1e120/File/nuteweliguzo.pdfIn PDF document text
    • http://mkconline.com/landmark/ckfinder/userfiles/files/fugariwasavesi.pdfIn PDF document text
    • http://evabody.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1608bba99867ab---31612865834.pdfIn PDF document text
    • https://empylean.com/wp-content/plugins/super-forms/uploads/php/files/64f37tmu549d0kmbb04lgcf9ak/sejikigalekekudefavutum.pdfIn PDF document text
    • http://makaeximworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cbda9238b2---zazikararusaxavolafovexav.pdfIn PDF document text
    • http://tacchigroup.com/public/thread/risorse/file/bajuwuwun.pdfIn PDF document text
    • https://imotrading.com/images/userfiles/15408390542.pdfIn PDF document text
    • https://stavbyhes.cz/ckfinder/userfiles/files/dafumiganonivibor.pdfIn PDF document text
    • http://www.kinoimaging.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160f0123b8c57e---17080495794.pdfIn PDF document text
    • https://charterboatdeliverance.com/uploads/files/femedowewitetudurutakolib.pdfIn PDF document text
    • http://onestep-tokyo.com/userfiles/file/73426178331.pdfIn PDF document text
    • http://tms-operation.com/upload/files/telusukato.pdfIn PDF document text
    • https://soyana.de/js/ckfinder/userfiles/files/66923556537.pdfIn PDF document text
    • https://secolink.sk/userfiles/file/1462831396.pdfIn PDF document text
    • https://movesforfree.com/wp-content/plugins/super-forms/uploads/php/files/fokoho60e6bipgbn46623acjm5/ladanojexatuzudez.pdfIn PDF document text
    • https://advancedbusiness.co/wp-content/plugins/super-forms/uploads/php/files/f5220639a7c6842aa019192cd9c21101/bupaxadudewesewex.pdfIn PDF document text
    • http://amoy-art.com/Upload/file/xizod.pdfIn PDF document text
    • https://anpheatingandac.com/nbloom/fckuploads/file/79059025118.pdfIn PDF document text
    • https://israelonthehouse.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2d609c236b---74537580572.pdfIn PDF document text
    • http://jointrilogy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086da91b64ac---39459615889.pdfIn PDF document text
    • https://bxthirteen.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/c3769b863e53c5d7ead001eb54d7eb67/xixelakavevuz.pdfIn PDF document text
    • 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_off0000eb03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB03 10900 bytes
SHA-256: 6667412ed3adbd56a32bee070b2b612d0e0da510d72b76e74c9b6466e5ef4481
font_01_sfnt_off000103fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103FE 17164 bytes
SHA-256: 13b488af56a37d30b4d884934c1d42000ee5a04f58510cdeb242ebe0a998cf51
font_02_sfnt_off000130a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x130A1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1