Malicious PDF — malware analysis report

Static analysis result for SHA-256 36aa5160f588c80d…

MALICIOUS

PDF

74.6 KB Created: 2021-09-07 22:19:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 65e7e19c26fede347a8666fe66489d43 SHA-1: 2405d01b6f762bb58a4fc2a491b4fb5b46bd9e6d SHA-256: 36aa5160f588c80d2f0cd5e6206da7eda0d60094634fae2d6b58cbc716320b98
156 Risk Score

Malware Insights

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

This PDF was identified as malicious by a machine learning classifier and ClamAV, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to multiple compromised or disposable hosting sites. The presence of numerous embedded URLs, many pointing to potentially malicious content, supports the conclusion that this document is designed to lead users to harmful destinations.

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://www.paparazzirestaurant.com.au/wp-content/plugins/super-forms/uploads/php/files/51657e2cfd392fbafe102888e7597970/juserelax.pdf In PDF document text
    • http://steakclubhn.com/campannas/file/dowusideroxokapo.pdfIn PDF document text
    • https://marblo.com/app/webroot/img/files/kisunakorisamamedosa.pdfIn PDF document text
    • https://wildarium.com/ckfinder/userfiles/files/6787022134.pdfIn PDF document text
    • http://springswellness.net/wp-content/plugins/formcraft/file-upload/server/content/files/160aaf945ebd46---javikinofedunesitupukuz.pdfIn PDF document text
    • https://loskutova.site/wp-content/plugins/super-forms/uploads/php/files/3a3b3ce8fe8bef9ab1ded10c6ad1bc22/92073054609.pdfIn PDF document text
    • https://dnsbp.com/all4help/fckuserfiles/file/10424342774.pdfIn PDF document text
    • https://ietc-oman.saktoon.com/userfiles/files/bijuduvatosupezivi.pdfIn PDF document text
    • http://www.annaleehuber.com/content_files/file/xirojuduxazuwepupafavojop.pdfIn PDF document text
    • https://kakvkusno26.ru/wp-content/plugins/super-forms/uploads/php/files/7a25d65a5be9f38c57695ed8a5bb3afc/52141784061.pdfIn PDF document text
    • https://asztromiskolc.hu/ckfinder/userfiles/files/36675829352.pdfIn PDF document text
    • http://tahyuh.com/uploads/files/202109040718334082.pdfIn PDF document text
    • https://brickbodysupplements.com/newerac2c/userfiles/file/lafaremutabenif.pdfIn PDF document text
    • https://sassanoproperties.com/FCKeditor/file/78088073742.pdfIn PDF document text
    • http://cgt-fo-csc.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607fb98e6d44d---48972902092.pdfIn PDF document text
    • http://inphuduong.vn/upload/files/49377119374.pdfIn PDF document text
    • http://www.colegiometa.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/160fd502a665e9---zizepas.pdfIn PDF document text
    • http://webinaris.org/ckfinder/userfiles/publics/files/mogos.pdfIn PDF document text
    • https://afanasyev-design.ru/wp-content/plugins/super-forms/uploads/php/files/0234a423dc008909b34cbe215bf3fbef/jaletusijogujunedaga.pdfIn PDF document text
    • https://ecohort.biz/userfiles/files/rirozaditarifafuroziv.pdfIn PDF document text
    • http://fapannimario.it/userfiles/files/66818159516.pdfIn PDF document text
    • http://www.hkwebdesign.com.hk/wp-content/plugins/formcraft/file-upload/server/content/files/16078a680316ce---mavobemuru.pdfIn PDF document text
    • http://vinhhangvien.com/upload/files/52494774688.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=bonding+chemistry+worksheetPDF 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_off0000c189.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC189 10956 bytes
SHA-256: f5fa47c21b99082f2c6a8ac161aa11f4c063314cd14abf51399816dba12dde0a
font_01_sfnt_off0000daa4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAA4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f2b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2B6 16404 bytes
SHA-256: e82ab219bd9cc4db3f5bc62e0d721d5a21326c5b20f5c4a55f062fe39b9dd5e1

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