Malicious PDF — malware analysis report

Static analysis result for SHA-256 e875de1a770bbdb0…

MALICIOUS

PDF

87.5 KB Created: 2021-09-12 18:37:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: bbb8895b89041a2374d9fb8f329c9061 SHA-1: d7afb471ed3fa171c20c6c611e01c69d1893bb72 SHA-256: e875de1a770bbdb0c5dc9ac253c8e04ac0596b6a8c1807d70422c08c6d368dd9
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier as malicious. It contains a high number of embedded links, many pointing to compromised WordPress installations and disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The presence of PDF_RANDOM_URL_LINK and PDF_SEO_DISPOSABLE_LINK_FARM heuristics indicates a deliberate effort to obscure the final destination and potentially evade detection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 7

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://irlanc.ru/uplcv?utm_term=best+launcher+for+customization PDF link annotation
    • https://bentzendesign.se/wp-content/plugins/formcraft/file-upload/server/content/files/16130e9c6790a8---36069721206.pdfIn PDF document text
    • https://www.lang-mayer.de/wp-content/plugins/formcraft/file-upload/server/content/files/16138d209380bf---muditazitod.pdfIn PDF document text
    • http://ankaraeksioglu.com/resimler/files/71304540573.pdfIn PDF document text
    • http://worldtile.net/jangheung/userfiles/file/32196557718.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/bae1ec25a4e0dd3c4998f7da99c5d9c2/2434515680.pdfIn PDF document text
    • http://maremio.ru/admin/ckfinder/userfiles/files/budujojimaliw.pdfIn PDF document text
    • http://wellfoto.cz/pictures/files/roredono.pdfIn PDF document text
    • http://ozt.zielonetarasy-cieplice.pl/uploads/userfiles/files/mitelofokatuzizuvujow.pdfIn PDF document text
    • https://storage-in-motion.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613cd3bf982f5---69363713605.pdfIn PDF document text
    • http://borisovhlebprom.by/var/upload/file/gojozuruda.pdfIn PDF document text
    • http://ekotop.eu/userfiles/file/julitawujolabilaboboxis.pdfIn PDF document text
    • http://mas.vacations/wp-content/plugins/formcraft/file-upload/server/content/files/1613d5c63de210---54048222485.pdfIn PDF document text
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/smoddeuqcl07ep1rm5ul3rf861/riveselexofiliduxe.pdfIn PDF document text
    • http://hz-karavany.cz/ckfinder/userfiles/files/wuketemosu.pdfIn PDF document text
    • http://imssp.by/data/images/fxeditor/file/55775507881.pdfIn PDF document text
    • https://webgirls-studio.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138f3ff379b8---mezewujamuwajaw.pdfIn PDF document text
    • https://autopsrus.aerovents.com/ckfinder/userfiles/files/28476746863.pdfIn PDF document text
    • http://kdbelektrotechniek.nl/uploads/file/30675252594.pdfIn PDF document text
    • http://ms-krmelin.cz/app/webroot/files/files/kiwikiwowebusezo.pdfIn PDF document text
    • http://izeninfo.net/admin/upload/files/wofemuzinezogugoxilogu.pdfIn PDF document text
    • http://elitsatodorova.com/uploadfiles/file/naligoremekubolowilivefu.pdfIn PDF document text
    • http://griesvoegwerken.nl/UserFiles/file/rabomipufeboju.pdfIn PDF document text
    • https://jv-cms.crazy-jessie.nl/uploads/files/28320928887.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_off0000f249.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF249 17176 bytes
SHA-256: c126ded90999e17213719cf6873f7c74dfe6be0260a3e63abd8be2a990b5b821
font_01_sfnt_off00011f03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F03 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001371a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1371A 10816 bytes
SHA-256: e491512ca9d48a230d5141d93bc064d4ed4cd2c2b463841161a95efd1a21b020

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