Malicious PDF — malware analysis report

Static analysis result for SHA-256 a2c2616ff722bee4…

MALICIOUS

PDF

86.8 KB Created: 2021-06-28 08:22:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: b8f8c95fa60bf9b96bb812a0821a75af SHA-1: e452d81f45949622d1d1abe6df02b57f15d7f154 SHA-256: a2c2616ff722bee4c246e0bacfec242c26700bc7f8f4e419c0d798515abf3c8d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics indicate the document functions as a link farm, directing users to multiple external URLs hosted on potentially compromised or disposable domains. While no scripts were explicitly extracted, the PDF structure and the nature of the URLs suggest it is designed to lead users to malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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://jamurgoreng.net/contents//files/44647720504.pdf In PDF document text
    • http://aldara-latinoamerica.com/userfiles/file/65259351296.pdfIn PDF document text
    • http://ahdongjiu.com/upload_fck/file/2021-6-24/20210624091513943186.pdfIn PDF document text
    • http://envigest.cz/upload/file/57307466318.pdfIn PDF document text
    • http://israel-aliya.com/wp-content/plugins/super-forms/uploads/php/files/697baa9a8c80d48a25076f420693a4d6/2516390575.pdfIn PDF document text
    • http://photographybynami.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606da1ce6dcdd---67673267355.pdfIn PDF document text
    • http://www.medical-psychology.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1608117841fb80---43847677552.pdfIn PDF document text
    • http://thaimassagemodel.com/ckfinder/userfiles/files/gazekimewadiwoderagurafab.pdfIn PDF document text
    • https://bonpetsupply.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084ffa042498---34340671086.pdfIn PDF document text
    • https://wcdt.co.th/wp-content/plugins/super-forms/uploads/php/files/c4jln17lre48q8s0n5k29jmgkf/luguruwemugom.pdfIn PDF document text
    • http://svenstavik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a8ab934976---xovudenuroditukoxiwi.pdfIn PDF document text
    • http://urgentcarepb.net/userfiles/file/59459123312.pdfIn PDF document text
    • http://ssaisarang.com/ckfinder/userfiles/files/77829610434.pdfIn PDF document text
    • http://mattstergamer.com/wp-content/plugins/super-forms/uploads/php/files/gru6vib0lpqgvek94ke0hffppu/dujag.pdfIn PDF document text
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/1amiscdc5h7nd57igal4fq9qj7/warakulevi.pdfIn PDF document text
    • https://amenagementsoleil.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ee09e5dfa5---46518640344.pdfIn PDF document text
    • https://discoverapartmentsforrent.com/wp-content/plugins/super-forms/uploads/php/files/0cb6df3e006b63a6d7818b2320abcd03/55271759774.pdfIn PDF document text
    • http://diplomat2014.ru/ckfinder/userfiles/files/34475292557.pdfIn PDF document text
    • https://inchiriereelicoptere.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160735b643e045---rejeduviperimumilonu.pdfIn PDF document text
    • https://joefairless.com/wp-content/plugins/super-forms/uploads/php/files/e5997a495f64c21ffc75ea1ac9da6522/vajogaxuvukaziruxevi.pdfIn PDF document text
    • https://wegofa.com/userfiles/file/38117108185.pdfIn PDF document text
    • https://rebel-guitars.com/wp-content/plugins/super-forms/uploads/php/files/faaab4363a84832d3fc175577e5a8fb7/68071776432.pdfIn PDF document text
    • http://myucmas.com/userfiles/file/tilaboxemolo.pdfIn PDF document text
    • http://ilovechardonnayhills.com/userimages/fumezulosi.pdfIn PDF document text
    • http://strahovka66.ru/userfiles/file/xonotifi.pdfIn PDF document text
    • http://www.movingintofreedom.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607577fac7b49---58593003651.pdfIn PDF document text
    • http://www.tobywells.org/media/fckdir/file/78032326050.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=what+can+i+make+out+of+cucumbersPDF 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_off0000f06d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF06D 16936 bytes
SHA-256: 2510aad0a6aaa5dded6a1dcde611b07877c2456b66dd9ae1643f402c7154e033
font_01_sfnt_off00011c8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C8F 10880 bytes
SHA-256: 861bdde48adb9b2bb3e217c4c8963d1a97a69136c6e7f67ca1ba0c04717eaaa1
font_02_sfnt_off00013590.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13590 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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