Malicious PDF — malware analysis report

Static analysis result for SHA-256 d5da021db1c544b7…

MALICIOUS

PDF

97.3 KB Created: 2021-07-07 13:03:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: c822a7d3745281339729412174732371 SHA-1: 2150f75038757a942ab061661612679ecc9ba2d2 SHA-256: d5da021db1c544b7d839c15ad1392d188cef2a3ca84e3136bdc0a3cc1336278a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a large number of embedded URLs, many of which point to compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate maliciousness, with ClamAV specifically identifying it as a phishing trojan. The document body is heavily obfuscated and unreadable, but the heuristic findings and URL analysis suggest the primary purpose is to redirect users to potentially malicious websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9936

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 https://bodwellassociates.com/wp-content/plugins/super-forms/uploads/php/files/78c3dfc6ec5cf886a53ef0f860e092f0/rimoboxuwerinodawiw.pdf In PDF document text
    • http://www.alwaysflorida.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f202c26e14---kokobiwebexonofa.pdfIn PDF document text
    • https://advantagelic.com/singhania/downloads/file/78751326837.pdfIn PDF document text
    • http://trackeg.com/en/wp-content/plugins/formcraft/file-upload/server/content/files/160a0cffd564f4---81287298561.pdfIn PDF document text
    • http://moreit.ch/productinfo/file/zudavukobutir.pdfIn PDF document text
    • https://eliteswimmingpoolsinc.com/wp-content/plugins/super-forms/uploads/php/files/ki2ntjsgeubr77tuqh8ptbod80/vararapo.pdfIn PDF document text
    • https://atlanthealth.com/wp-content/plugins/super-forms/uploads/php/files/ae9e29e23db50a5948a4ae381b97c8e6/56171818312.pdfIn PDF document text
    • http://congtrinhnhaviet.vn/upload/files/rudezafunajinil.pdfIn PDF document text
    • http://lalitas-thaimassage-spa.de/wp-content/plugins/formcraft/file-upload/server/content/files/16089ce310f3e4---fotipupaxaloja.pdfIn PDF document text
    • http://cupta.org/userfiles/files/20210622001956.pdfIn PDF document text
    • https://pakistanchristiancongress.org/userfiles/file/29314927096.pdfIn PDF document text
    • https://simplehome.ro/ckfinder/userfiles/files/77373589335.pdfIn PDF document text
    • https://www.couleurs-et-jardin.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160ad97c143261---kibedopunojagixawizos.pdfIn PDF document text
    • http://baugeraeteverleih.de/benutzerdateien/xodafazuwixewaxo.pdfIn PDF document text
    • http://leaguengn.com/userfiles/file///melozofuma.pdfIn PDF document text
    • https://tocgia247.com/wp-content/plugins/super-forms/uploads/php/files/g3p5mjl1j00jua7e8qt6f5thlc/97827639141.pdfIn PDF document text
    • http://bocghebinhduong.com/media/ftp/file/29685261879.pdfIn PDF document text
    • http://chocolatycakes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a12ab64f28---15438836325.pdfIn PDF document text
    • https://irisapp.cn/uploadfiles/fckeditor/20210518/file/16212796825917.pdfIn PDF document text
    • http://herodumpsterrental.com/wp-content/plugins/super-forms/uploads/php/files/a64e73e6055bd3e3d5c8e119c2233f71/kutaxaw.pdfIn PDF document text
    • http://antwerp-rentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c88892335a---7221222014.pdfIn PDF document text
    • https://e-lightingcontrols.com/wp-content/plugins/super-forms/uploads/php/files/8a613e43b40022cae64af9cde1c5ca2f/kofad.pdfIn PDF document text
    • http://elonsummerstorage.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afdc3931dc9---zuliloditudaro.pdfIn PDF document text
    • http://amwordpress.org/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca8293569a---77152066107.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=pronouns+and+antecedents+with+dinosaursPDF 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_off00011810.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11810 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00013027.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13027 10608 bytes
SHA-256: 502631eaae843353a7dcb59e9e108357b3814582f80895c8cf3798ce8973ce54
font_02_sfnt_off0001486f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1486F 17892 bytes
SHA-256: 2e2788a8eda0887554e660cfef6f2e607162a3ef801dbe7a71b9113d340a649f

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