Malicious PDF — malware analysis report

Static analysis result for SHA-256 1bee79fe6dae77f7…

MALICIOUS

PDF

89.5 KB Created: 2021-09-08 10:30:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 479041f37319f0cbf708454c7f2cf076 SHA-1: 3e5450e33895793f2db7a3cbb31334916f3f88a2 SHA-256: 1bee79fe6dae77f7961366c7020b2ac783afa67f5184464322af57dcb6eae76b
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. It contains numerous links, many pointing to potentially compromised or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The presence of multiple PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9913

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://luckyfood.itweald.com/uploads/files/612add5f8b948.pdf In PDF document text
    • https://brawlcall.jordanadams.com/ckfinder/userfiles/files/xilijegawinevomovab.pdfIn PDF document text
    • https://tcufroghouses.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3b3e93067a---regupifus.pdfIn PDF document text
    • http://abnicum.com/files/file/nezebikisuresi.pdfIn PDF document text
    • http://szzxwx.com/Upload/Upload/file/20216161034238137.pdfIn PDF document text
    • https://eclipsetheaters.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc15ac55fa8---kukukeg.pdfIn PDF document text
    • https://motoquadro.de/userfiles/file/loxejo.pdfIn PDF document text
    • https://braviengenharia.com.br/wp-content/plugins/super-forms/uploads/php/files/p97jbho28o3lr5qm8f6vgre3mb/bukopirakalimasunesem.pdfIn PDF document text
    • http://www.magicapro.it/wp-content/plugins/formcraft/file-upload/server/content/files/160badf18330ae---15285563040.pdfIn PDF document text
    • https://xn--p3t29jo1ed4o4xw.tw/upload/files/wekumiwebizukutazuvemumo.pdfIn PDF document text
    • https://petroblend.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a8be8a4c33---18560795726.pdfIn PDF document text
    • https://quatden.vn/webroot/img/files/86864021609.pdfIn PDF document text
    • http://kiajihlava.cz/UserFiles/File/daworizu.pdfIn PDF document text
    • http://tecsun-moscow.ru/docs/file/70571359386.pdfIn PDF document text
    • http://www.eau-msu.ru/ckfinder/userfiles/files/37068279040.pdfIn PDF document text
    • http://luxlustry.ru/img/upload/jagijipuwagakoweliwuz.pdfIn PDF document text
    • https://hsegroup.ru/wp-content/plugins/super-forms/uploads/php/files/vbjscshqgu6iqnv741gqles5q3/20182729703.pdfIn PDF document text
    • http://debeight.net/UserFiles/File/98218653764.pdfIn PDF document text
    • http://autowagon.it/userfiles/files/xunafetuwivufuvaj.pdfIn PDF document text
    • http://www.gaviprintpack.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072def8062d5---zufat.pdfIn PDF document text
    • http://fasson.vip/images/editor/files/26267159122.pdfIn PDF document text
    • https://almoheetmanpower.com/public_html/userfiles/file/bavomapegasisajabepok.pdfIn PDF document text
    • http://bulk-supplies.com/userfiles/file/xemoxuruvu.pdfIn PDF document text
    • http://www.pattyn360.com/upload/forum/files/74254677013.pdfIn PDF document text
    • https://www.finestkindcharter.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609281a295999---pivuwekeveburabali.pdfIn PDF document text
    • http://haciogullari.com/depo/sayfaresim/file/66971843839.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=worksheet+sa+magkasalungat+na+salitaPDF 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_off0000f588.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF588 18840 bytes
SHA-256: 5b95929f1d428f37fe17be7b2dab7380b935a0cd56192e5f4a1f669bcd8c0f35
font_01_sfnt_off00012718.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12718 10740 bytes
SHA-256: 856d483f35a5555147c309200e647ea32c4a2ebc7cc1506da40ac4e3a6f3d83c
font_02_sfnt_off00013fa5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13FA5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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