Malicious PDF — malware analysis report

Static analysis result for SHA-256 addebc90a633f67f…

MALICIOUS

PDF

102.9 KB Created: 2021-09-05 08:10:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: e06dd9543cec74382e590e58c0923216 SHA-1: 0401f06141bd7289f03e509cf95adcb6eb793ebf SHA-256: addebc90a633f67f65817ba82b331f7b164149370b3e7c39949db7193a1aa24a
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised websites, specifically targeting WordPress upload directories. These links host other PDF files, suggesting a multi-stage download or phishing campaign. The ML classifier strongly indicates malicious intent, and the presence of a link farm on disposable hosting further supports this. No scripts were extracted, limiting the analysis of direct execution capabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

Heuristics 5

  • 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.potterycommercials.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608ea4258087e---vujerimerogogojitanumejo.pdf In PDF document text
    • http://plenar.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1606caa717e1ec---wifoma.pdfIn PDF document text
    • http://almar-bus.pl/userfiles/file/tutebig.pdfIn PDF document text
    • http://sriagasthiyarastro.com/FCKeditor/userfiles/file/suxedefuletamowin.pdfIn PDF document text
    • http://garantc.ru/userfiles/file/fagitifowelerojevuv.pdfIn PDF document text
    • http://artechq8.com/beta/uploads/files/ribulafe.pdfIn PDF document text
    • https://www.helpfulhunks.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1609a7f1c9d473---15281761781.pdfIn PDF document text
    • http://favorit.pl/userfiles/file/vakewirawefe.pdfIn PDF document text
    • https://www.northamericatalk.com/wp-content/plugins/formcraft/file-upload/server/content/files/16103c689ce18d---wasirokowofosu.pdfIn PDF document text
    • http://jtour.vn/userfiles/file/zasafuve.pdfIn PDF document text
    • https://pfhotel.gr/ckfinder/userfiles/files/42402069314.pdfIn PDF document text
    • http://pomodorolennep.de/gfx/userfiles/files/40368156086.pdfIn PDF document text
    • http://hillsdalehorseboarding.com/ckfinder/userfiles/files/93632797151.pdfIn PDF document text
    • https://visaonline-vn.com/wp-content/plugins/super-forms/uploads/php/files/ud78vu7rg60mlqb3bd1o8u0hgp/35292481251.pdfIn PDF document text
    • http://www.studiolegalefusimorelli.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e3472edb010---deburuvugobe.pdfIn PDF document text
    • http://gildiamasterov.ru/userfiles/file/wutuxurefujedeleriwube.pdfIn PDF document text
    • http://chrisnoblelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/37156756732.pdfIn PDF document text
    • https://iguanapools.com.au/wp-content/plugins/super-forms/uploads/php/files/gu3uin9cqpmolb1128uea46m2a/kopaxawuwojopip.pdfIn PDF document text
    • https://esvigo.com/upload/files/leviwuvapuzuduxuneji.pdfIn PDF document text
    • http://arci-mp.fr/admin/File/89169404264.pdfIn PDF document text
    • http://martonelektro.hu/files/file/vugezesalinidemuzudidib.pdfIn PDF document text
    • https://readxyz.com/wp-content/plugins/super-forms/uploads/php/files/576d7186973ff99ec776a578fca769ac/kewepinobon.pdfIn PDF document text
    • https://adian.eus/files/galeria/files/vurinakexuvipuwevepodevax.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=sample+rental+lease+agreement+pdfPDF link annotation
    • https://rt9.rspo.org/ckfinder/userfiles/files/gilujelogowifomafogiwinog.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00012b69.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B69 10704 bytes
SHA-256: 372719f73004f8b2fb562a7591c83a88acce57aa22eadce0853996ab239501a6
font_01_sfnt_off000143bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x143BD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00015bcf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15BCF 19208 bytes
SHA-256: f1492661e678a33566df5ae03bd5db9aa27caebc23f10e42472f10e6b5ce370b