Malicious PDF — malware analysis report

Static analysis result for SHA-256 3af6dfc5c7ef0de0…

MALICIOUS

PDF

125.2 KB Created: 2021-09-03 18:35:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-27
MD5: 9e78386237d555646f869397cae09aa3 SHA-1: 1b757216d8bab0dee721bc2f528e4c402406a57d SHA-256: 3af6dfc5c7ef0de07472f94e0dcb988d0b5c562e679c9fe9c5cd1954e6230427
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many pointing to compromised websites or disposable domains, indicating a link farm designed to redirect users to malicious content or phishing pages. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution, aligning with the Spearphishing Attachment technique.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9927

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://coretry.ru/uplcv?utm_term=tavola+periodica+degli+elementi+completa+in+italiano+pdf PDF link annotation
    • http://mistral-paints.cz/userfiles/files/84788421713.pdfIn PDF document text
    • https://baigiangtoanhoc.com/upload/files/lewegopudunomuk.pdfIn PDF document text
    • https://stmpallet.com/ckfinder/userfiles/files/migusuzokiguvulogup.pdfIn PDF document text
    • http://libron.pl/fckupload/assets/file/57523254889.pdfIn PDF document text
    • http://centromp.it/userfiles/files/95020489872.pdfIn PDF document text
    • https://sitebyside.ru/wp-content/plugins/super-forms/uploads/php/files/7a69dc8fc6fdbbf0d28353d145f1ec6c/49240451520.pdfIn PDF document text
    • https://towa-aaa.jp/userfiles/file/71322780332.pdfIn PDF document text
    • https://noukos.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160c3a251cca6c---88918295461.pdfIn PDF document text
    • http://www.maderas-navarro.com/ckfinder/userfiles/files/63392751428.pdfIn PDF document text
    • https://www.growxponential.com/wp-content/plugins/super-forms/uploads/php/files/go8ds7718hd8grkdhp2qleglab/ratini.pdfIn PDF document text
    • http://assistance.uz/images/shared/file/xemuwofu.pdfIn PDF document text
    • https://argentinaproduct.com/ckfinder/userfiles/files/86899422614.pdfIn PDF document text
    • https://nikosdimos.gr/userfiles/file/20683546724.pdfIn PDF document text
    • http://mulroyenvironmental.ie/userfiles/file/ruribopejiwire.pdfIn PDF document text
    • http://tcurryproperties.com/konadnew/userfiles/file/toxirif.pdfIn PDF document text
    • http://luckyassessoria.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608d9a5306d3b---zaxunitejivulodedaw.pdfIn PDF document text
    • http://bubblesoflove.net/wp-content/plugins/formcraft/file-upload/server/content/files/1606c9f55c3314---42110460880.pdfIn PDF document text
    • http://sakirnoopo.ru/wp-content/plugins/super-forms/uploads/php/files/b2aa6ba51daffd662f6796494f9f2000/76169274864.pdfIn PDF document text
    • http://melissajacksonmd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608132b5106f2---xofinesojisetubevanesu.pdfIn PDF document text
    • https://hoavily.com/uploads/files/15170939705.pdfIn PDF document text
    • https://atiksigorta.com/files/paxagegida.pdfIn PDF document text
    • https://kurtwohndesign.ch/userfiles/files/80249740673.pdfIn PDF document text
    • http://topopentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a3ce4db623---menojasibop.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001696a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1696A 10824 bytes
SHA-256: a026e7ec0d81951f4c36f34b9f4b9656c5e7963259aa7bfab91ec42bb8451f0c
font_01_sfnt_off00018230.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18230 20640 bytes
SHA-256: 80aed33367a2dfb05eae15948cde0c8c024e043d038cbe144750dda74d1198fd
font_02_sfnt_off0001b7df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B7DF 16240 bytes
SHA-256: 80d2f50ebd5fb67c42b7995ba73d7812c7e0c7baf6873514e63e5e2f17ab95d7
font_03_sfnt_off0001cddd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1CDDD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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