Malicious PDF — malware analysis report

Static analysis result for SHA-256 24385ad89de38700…

MALICIOUS

PDF

67.8 KB Created: 2021-09-16 21:09:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 371987bf9ad1bac82b36550ec735e404 SHA-1: 2a42d477bb5fef58eb97a2b80bc1ca87438fcff9 SHA-256: 24385ad89de387008c997d9f65ed4584f4d59c2d10be4bf13d8214407ddb0ddc
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress sites and disposable hosting, indicating a link farm designed to distribute malicious content or phish users. ClamAV detection and ML classification strongly suggest malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9957

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://portalkucharski.pl/app/webroot/media/files/kuwisi.pdf In PDF document text
    • https://ijtm.in/userfiles/file/23398963436.pdfIn PDF document text
    • http://cetinelektrik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/161307b6242998---puvijafabaxuruwewa.pdfIn PDF document text
    • http://eggtesting.com/admin/uploads/file/zesexipo.pdfIn PDF document text
    • http://huntland.hu/upload/file/badurusivesevi.pdfIn PDF document text
    • http://ksiclub.org/projects/achievemore/admin/upload/fckImages/file/lufujejuf.pdfIn PDF document text
    • http://purepassion.pl/userfiles/file/dozexewikowugez.pdfIn PDF document text
    • http://lutechmed.com/Images_upload/files/zadilodolixiba.pdfIn PDF document text
    • http://orderkai.com/uploads/files/55451416004.pdfIn PDF document text
    • http://archbot.pl/files/file/42938149318.pdfIn PDF document text
    • http://fishngrill.iorderfoods.com/uploads/files/zabalulotujaxexox.pdfIn PDF document text
    • http://eikenhorstgroep.nl/userfiles/file/dojagavaxivi.pdfIn PDF document text
    • https://classconnbio.com/img-jacson/files/xowipo.pdfIn PDF document text
    • https://dbhattacharjee.com/ckfinder/userfiles/files/13309421812.pdfIn PDF document text
    • http://studiotecnicobonoli.com/userfiles/files/debopepiduvej.pdfIn PDF document text
    • http://ednak.com/wp-content/plugins/formcraft/file-upload/server/content/files/161395989b5cb3---44060913110.pdfIn PDF document text
    • http://startent.ru/SITE/files/editor/file/verofavapagewaregetabopo.pdfIn PDF document text
    • http://k12kos.com/ckfinder/userfiles/files/58182223824.pdfIn PDF document text
    • http://lilit-realty.com/wp-content/plugins/super-forms/uploads/php/files/qemett7bjpb1ciklakv7m5ids4/xebubodiwexu.pdfIn PDF document text
    • http://residenzaeden-albisola.com/userfiles/files/27797508864.pdfIn PDF document text
    • http://760_709737661.mildmedia-dev.eu/uploads/userfiles/files/jajoranosubiwevapesozitib.pdfIn PDF document text
    • http://comicpapyrus.com/wp-content/plugins/super-forms/uploads/php/files/bb431fb1e73f0650bbfee984e43f1cb0/pirumuxojinaremeputisenu.pdfIn PDF document text
    • http://zhongguohuachun.com/d/files/ratibodemefonidufonafexig.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=kindle+download+androidPDF 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_off0000af06.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF06 10052 bytes
SHA-256: e05e1436c20ad4f4d278c0dc17117ef70b8db59ac9dd2adbb2474f54faaa63f8
font_01_sfnt_off0000c56e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC56E 14728 bytes
SHA-256: a55ee854201df19f0599dc3755ab6abee1cda8c7749ff7d61e4064c27e664b0c
font_02_sfnt_off0000e9ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9FF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1