Malicious PDF — malware analysis report

Static analysis result for SHA-256 ab283c525b225acb…

MALICIOUS

PDF

70.3 KB Created: 2021-09-27 13:38:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 75747e8978f8b3b6594287d8b151da90 SHA-1: 8c3f9a04145e6347d82208a39e77c937a6fedcf2 SHA-256: ab283c525b225acb616799de77e63ecc0fdcf5ebffb5dc94050796d620ce6e1d
156 Risk Score

Malware Insights

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

This PDF was flagged by ML classifiers and ClamAV as malicious. It contains a link farm with numerous URLs pointing to various domains, some of which appear to be compromised CMS uploads or hosted on disposable infrastructure. The primary purpose seems to be directing users to external, potentially malicious content, consistent with phishing or malware distribution tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 http://www.logistiekverbeteren.nl/ckfinder/userfiles/files/27056608645.pdf In PDF document text
    • http://denkobarbell.com/_upload/files/piradoboruset.pdfIn PDF document text
    • https://cvzona.lt/resources/img/files/nofokujumakagixoperi.pdfIn PDF document text
    • https://alquimia.in/admin/fckeditor/editorfile/65921621781.pdfIn PDF document text
    • http://sumtinathholidays.com/admin/uploadfiles/file/18428397317.pdfIn PDF document text
    • https://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/16144c1cb7680b---basujof.pdfIn PDF document text
    • http://dienmaythanglong.org/uploads/files/34419908554.pdfIn PDF document text
    • http://sungwoneng.com/upfile_editor/2021/files/86265133290.pdfIn PDF document text
    • http://budka39.ru/files/nepupiwodatewuv.pdfIn PDF document text
    • http://www.madiran-cruduparadis.fr/ckfinder/userfiles/files/nubulerufep.pdfIn PDF document text
    • https://swaarm.de/app/webroot/upload/files/4697987359.pdfIn PDF document text
    • http://israel-aliya.com/wp-content/plugins/super-forms/uploads/php/files/f2ac023fbb13d1fadf375e9b0e68cf7e/24280616606.pdfIn PDF document text
    • https://euinsuti.ro/app/webroot/files/userfiles/files/2080144546.pdfIn PDF document text
    • http://a-mega.ua/images/uploads/file/sazaralusenafex.pdfIn PDF document text
    • http://asalsold.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f0790d1192---jovizobapepidewuzelidepus.pdfIn PDF document text
    • http://pensjonatagat.pl/userfiles/file/16624879816.pdfIn PDF document text
    • http://kirakuramenandsushi.com/uploads/files/namawodev.pdfIn PDF document text
    • https://haciendaloscipreses.cl/upload/file/sezuduzulilag.pdfIn PDF document text
    • http://ventexevent.se/uploads/file/famukewipudiveziguwavog.pdfIn PDF document text
    • http://atlantichomeportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/16146fb9288f08---11388851758.pdfIn PDF document text
    • http://abwrosedale.com/uploads/files/misetuwikikesisurikamu.pdfIn PDF document text
    • http://www.thaiboat.net/image/upload/File/51053222549.pdfIn PDF document text
    • http://twtime.com/uploads/files/202109060328272454.pdfIn PDF document text
    • http://herve-coiffure.ci/files/75522193408.pdfIn PDF document text
    • https://purmoradiatoriai.lt/images/files/gatetuvikib.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=best+desktop+browser+for+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_off0000b377.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB377 10816 bytes
SHA-256: 88237ec25b857a2ac82622979456eefef5d3fa8a98744fd86314de4f79319434
font_01_sfnt_off0000cc70.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC70 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e482.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE482 15440 bytes
SHA-256: de46a948f7d90f0c94dee012d8b4756d497a1451d6dd9268a84ae727adb87dc4

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