Malicious PDF — malware analysis report

Static analysis result for SHA-256 ca5e67573152e9c5…

MALICIOUS

PDF

84.8 KB Created: 2021-09-04 08:08:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 68dff2c455f1c6e0f06506ce235fd7fa SHA-1: ca204add21687eaa2b4de5966c13208db674819d SHA-256: ca5e67573152e9c5b0d7915d93ae1e2ebe71972cf133ad06e871a70b3a9785ad
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous links to external websites, many of which appear to be compromised or disposable hosting, suggesting a link farm for malware distribution or phishing. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were explicitly extracted, the presence of external links and the nature of the heuristics point towards a phishing or malware delivery mechanism, likely initiated via spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://archism.ru/uplcv?utm_term=strength+of+materials+sadhu+singh+pdf+free+download PDF link annotation
    • https://lasvegasrebath.com/wp-content/plugins/super-forms/uploads/php/files/fe352eb0518419412f0272d9e3258de1/71869453853.pdfIn PDF document text
    • http://www.kevinbrooks.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607dbfa67cda0---11227532715.pdfIn PDF document text
    • http://lab4050.com/upload/editor/file/37324999831.pdfIn PDF document text
    • http://laboratoriodiprogettazione-ve.it/userfiles/files/93765296927.pdfIn PDF document text
    • https://soudurelausiere.ca/upload/editor/file/25025351355.pdfIn PDF document text
    • http://innotec-industrie.be/userfiles/file/7260806301.pdfIn PDF document text
    • https://netshopnepal.com/userfiles/file/19158305136.pdfIn PDF document text
    • https://nirkongrp.com/ckfinder/userfiles/files/17323943874.pdfIn PDF document text
    • http://safeabortionnepal.com/userfiles/file/mixol.pdfIn PDF document text
    • https://mindweave.co.uk/wp-content/plugins/super-forms/uploads/php/files/52on6n2i2u34vtihg49mmhdaii/taganulefajanasogela.pdfIn PDF document text
    • http://asbufestival.com/uploads/FCK_files/file/75025305433.pdfIn PDF document text
    • http://a-range.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1610a46ae368c4---tuvivunuvanaf.pdfIn PDF document text
    • https://etadelloro.it/images/file/bavesomoninoko.pdfIn PDF document text
    • https://ilexgold.com/app/webroot/files/userfiles/files/59013523909.pdfIn PDF document text
    • https://liniagdanskzydowo.pl/files/15657229476.pdfIn PDF document text
    • http://qtjdb.com/UploadFile/2021/05/11/file/20210511_105157_103.pdfIn PDF document text
    • http://eduomania.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071ec0ba56a6---96444034539.pdfIn PDF document text
    • http://dataction.org/demo/dataction/media/99577420473.pdfIn PDF document text
    • http://altinay-law.com/images/file/biragulefemaxuwumipuwo.pdfIn PDF document text
    • http://friulanapanini.com/images/file/8281261854.pdfIn PDF document text
    • http://jagatjyotischool.org/jagatjyotischool/userfiles/file/tuwadaduwerujidoveruradun.pdfIn PDF document text
    • https://www.bouwenaaneensterkwerkgeversmerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1611bfb5bd823a---31717495077.pdfIn PDF document text
    • https://higher-reason.com/wp-content/plugins/super-forms/uploads/php/files/4t073vgie3adggndd63to6fto0/632240043.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610eda0917f39---22577611795.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_off0000e288.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE288 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fa9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA9A 19232 bytes
SHA-256: 197c24e553d120ff8741b3f0be1bd176b01e737932d3fbaca005a7741e7d9c91
font_02_sfnt_off00012b87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B87 11208 bytes
SHA-256: 66c517ddc9efab3f8161757dfa91d3ef2a9a38b105e66f9ace8cc3ecc841c4f4

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