Malicious PDF — malware analysis report

Static analysis result for SHA-256 6e520c73d444bc03…

MALICIOUS

PDF

83.8 KB Created: 2021-09-03 02:08:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 9ffcdb154536b4a2bd008ff61939dd47 SHA-1: 0c987052c1ea0fee2f1497ee70ec17da7c433d90 SHA-256: 6e520c73d444bc03d360c5214c9efc322edbc91d245ac9dbb9f0ffa603cb9a0c
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to disposable hosting or compromised CMS upload directories, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

Heuristics 6

  • 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.
  • 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://www.emmabowman.com/wp-content/plugins/super-forms/uploads/php/files/4a47ae2edd695d3d9e15b235b052b1a3/80534690509.pdf In PDF document text
    • http://etpatatietpatata.com/userfiles/files/solopadevov.pdfIn PDF document text
    • http://tandprotheses.com/ckfinder/userfiles/files/xebenejiwifuretunabom.pdfIn PDF document text
    • http://archissimo.eu/userfiles/files/linajupovi.pdfIn PDF document text
    • http://dalaichau.com/files/48866451073.pdfIn PDF document text
    • http://mh-gartengestaltung.de/userfiles/file/50226500534.pdfIn PDF document text
    • http://ehomeforeclosure.org/images/file/tijav.pdfIn PDF document text
    • https://piuspvc.it/userfiles/file/98723375025.pdfIn PDF document text
    • https://led7.ru/file/16551747277.pdfIn PDF document text
    • http://csptech.net/admin/userfiles/file/xazopuvevuzirulinosisoza.pdfIn PDF document text
    • http://www.everhouse.lt/wp-content/plugins/formcraft/file-upload/server/content/files/1608a73279ca69---lamukexidepasipomerowez.pdfIn PDF document text
    • http://aranykoronakft.hu/userfiles/file/jixixesobelozepunilijo.pdfIn PDF document text
    • http://www.haztartasigepszakuzlet.hu/pics/file/bagutinekipejozamezoper.pdfIn PDF document text
    • https://rajatotogroup3.com/contents//files/63746792938.pdfIn PDF document text
    • http://ps-chiptuning.hu/userfiles/files/goxabazopekinaris.pdfIn PDF document text
    • https://themodernla.com/wp-content/plugins/super-forms/uploads/php/files/164e4cf925ed1b7dc80297b5e385afbd/86767530136.pdfIn PDF document text
    • http://emons-verlag.net/testarea/cwsCMSlight/media/files/bejiwewuxivolunozel.pdfIn PDF document text
    • http://www.expertnutritionadvisor.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bfdc3c8d202---duran.pdfIn PDF document text
    • https://www.cibaospalaser.com/wp-content/plugins/super-forms/uploads/php/files/9gk54p1guoaqlj08si1n558q42/56849277154.pdfIn PDF document text
    • http://ibiforstarlight.org/clients/3/3c/3cfcca4e360ca8807b7dd7d6e7cbeae0/File/kokijibazivunimixumas.pdfIn PDF document text
    • https://humanistbeauty.com/wp-content/plugins/super-forms/uploads/php/files/iojajbqkt6npj72e6hq8b12pn4/karurakena.pdfIn PDF document text
    • https://zemiigori.com/uploads/file/kinopol.pdfIn PDF document text
    • http://www.veronicaneal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/1607b6b000fb8b---15111296883.pdfIn PDF document text
    • http://gz-theoutfit.com/UploadFiles/FCKeditor/20210621185734.pdfIn PDF document text
    • http://tvoirostov.ru/ckfinder/userfiles/files/70400824852.pdfIn PDF document text
    • http://jnafarms.com/clients/864068/File/rugikenetudapitozeb.pdfIn PDF document text
    • http://circolosilverblufitnessclub.eu/userfiles/files/24693296572.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=verset+biblique+sur+la+foi+pdfPDF 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_off0000d992.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD992 10740 bytes
SHA-256: 96fa20ca7e3b1b4f0899da0820893a29f5eda194ca1d2cae8245cd1a6c7ad635
font_01_sfnt_off0000f1f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1F3 21524 bytes
SHA-256: 71a17c93007c73149c288d0399d57ceed24ecea9ab45770c510511285c77f257
font_02_sfnt_off0001278d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1278D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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