Malicious PDF — malware analysis report

Static analysis result for SHA-256 e1107086afbba5ad…

MALICIOUS

PDF

79.4 KB Created: 2021-09-06 09:31:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: f0e24ff72012f5dd7a0ff29b2b4ca9f5 SHA-1: 19a881e0812b0f380902e0f3b897baa9c2bbf4ea SHA-256: e1107086afbba5ad48bcf01448429837dc37a330b2a03cbb64049b5f23253f22
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload storage or disposable hosting, indicating a link farm designed to distribute malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware delivery via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://crewmak.ru/uplcv?utm_term=modern+abc+books+pdf+download PDF link annotation
    • http://gangwonbnb.com/FileData/ckfinder/files/20210603_5579F51D5C3FB1AE.pdfIn PDF document text
    • http://drapikowski.pl/uploaded/fck_files/file/16688716219.pdfIn PDF document text
    • http://entryexpress.online/chapter_images/files/napukemesu.pdfIn PDF document text
    • https://datajournonepal.org/files/17402277206.pdfIn PDF document text
    • http://beiwendq.com//data/attachment/file/40442683240.pdfIn PDF document text
    • http://www.lbf-cosmetics.com/website/wp-content/plugins/formcraft/file-upload/server/content/files/1606db94f1a503---zotukububofixatetujakuvo.pdfIn PDF document text
    • http://confidenzacsapagy.hu/upload/86102538928.pdfIn PDF document text
    • https://provisionsinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e56f999c3c5---lobubenebidurifepuripu.pdfIn PDF document text
    • http://xn--80aaffebba2apgigwiiececnggk9e4k.xn--p1ai/pict/file/vomisisefe.pdfIn PDF document text
    • http://guides2alpes.fr/uploads/file/gosajazavovasubinifimufim.pdfIn PDF document text
    • https://selectwifi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160acdbdc613e6---80274731361.pdfIn PDF document text
    • https://xn--80aanugxqi.xn--p1ai/admin/ckfinder/userfiles/files/42732747760.pdfIn PDF document text
    • http://pitafest.com/clients/1/13/1337b7689af00ddd847345d48bd720ff/File/40290368511.pdfIn PDF document text
    • http://luxmeterthai.com/ckfinder/userfiles/files/60197627594.pdfIn PDF document text
    • http://aldo-ins.com/userfiles/file/38917361811.pdfIn PDF document text
    • http://burelomdo.com/ckfinder/userfiles/files/dagutogenowekomegil.pdfIn PDF document text
    • http://zlato-stribro-investice.com/upload/files/dakid.pdfIn PDF document text
    • http://sowitech.vn/upload/files/68912281101.pdfIn PDF document text
    • https://adepotcustom.com/UploadFiles/file/20210513224434181.pdfIn PDF document text
    • https://www.plsok.com/wp-content/plugins/super-forms/uploads/php/files/438b9ffeb3633eee6947dc4e96a5b4d5/88175101440.pdfIn PDF document text
    • http://baharemadinah.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b667770432---lizoxunoxiv.pdfIn PDF document text
    • https://www.rydalmereprestige.com.au/wp-content/plugins/super-forms/uploads/php/files/8dqh4i5kd8iph144v2q4h7u1uq/luvujurozo.pdfIn PDF document text
    • http://nowator-zpu.pl/userfiles/file/jalutoveximaw.pdfIn PDF document text
    • http://s292376414.onlinehome.fr/datas/imgmail/file/29400225103.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_off0000d3be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3BE 10732 bytes
SHA-256: ca3ada51412761c967f5e802bfa923fb071bac79bb78fa9ff8e23a2486652b6a
font_01_sfnt_off0000ec5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC5E 16840 bytes
SHA-256: 53b3e856ad5bfb235cc27087d9fa7c3cc122947e04aad43c911b8f305be51cb4
font_02_sfnt_off000117f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117F8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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