Malicious PDF — malware analysis report

Static analysis result for SHA-256 a8d790d6f8b2e72a…

MALICIOUS

PDF

85.4 KB Created: 2021-09-20 15:29:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: b363cc7adaabb8f31a2d6aa378b54959 SHA-1: e632187c59346c5dc57b96c481b270ec756192b4 SHA-256: a8d790d6f8b2e72a96a30b04510a111c4847fb62c1e07b9b6b897e0ba2399ea0
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains embedded JavaScript and numerous external URIs, many of which point to compromised or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of embedded JavaScript indicates an attempt to execute code within the user's browser or PDF reader.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://cpc-serbia.org/js/files/tosikeloxus.pdf In PDF document text
    • http://wangguanhardware.com/userfiles/file/lorepojer.pdfIn PDF document text
    • https://preprodpcb.com/userfiles/files/rujejedapodolimut.pdfIn PDF document text
    • http://reliancefla.com/admin/images/file/dipisibamuwiz.pdfIn PDF document text
    • https://alicantea.centralcms.cloud/galeria/files/vifinaxebizo.pdfIn PDF document text
    • https://noriupapildu.lt/ckfinder/userfiles/files/6414584471.pdfIn PDF document text
    • http://specimport.by/files/files/jubilejejifefotusiv.pdfIn PDF document text
    • http://villaturri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ea482e0565---34142421688.pdfIn PDF document text
    • http://studiopiergentili.it/userfiles/files/wixiz.pdfIn PDF document text
    • https://www.gpaci.org.br/cms/ckfinder/userfiles/files/64324007665.pdfIn PDF document text
    • https://gelblighting.com/userfiles/files/jafudunof.pdfIn PDF document text
    • https://unitytradecapital.com/ckfinder/userfiles/files/41745483513.pdfIn PDF document text
    • http://sieuthikhoacaocap.vn/upload/files/33530711264.pdfIn PDF document text
    • http://www.everhouse.lt/wp-content/plugins/formcraft/file-upload/server/content/files/16142d1a73127a---silorigusagebutanebaxe.pdfIn PDF document text
    • http://ekachaiguitarist.com/ckfinder/userfiles/files/96415479674.pdfIn PDF document text
    • https://jecoexports.com/ckfinder/userfiles/files/vujigerotixifolus.pdfIn PDF document text
    • https://boumqueur-edition.com/upload/fckeditor/file/tulit.pdfIn PDF document text
    • http://taiwanglassgroup.cn/userfiles/file/jeriworuk.pdfIn PDF document text
    • https://otterdisplay.com/userfiles/file/65168565537.pdfIn PDF document text
    • http://vswet.ru/f/jiwuzowibovakofovokawed.pdfIn PDF document text
    • http://enjoybowlramenandpoke.com/uploads/files/wijapixemodanulisadabodub.pdfIn PDF document text
    • http://lotuscourtpune.com/wp-content/plugins/super-forms/uploads/php/files/dc07d1b7be39e195dc1edc8ea0404079/kunevugirarerid.pdfIn PDF document text
    • https://skopjemuzikon.pmgrecordings.com/ckfinder/userfiles/files/47800881584.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=activecollab+android+appPDF 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_off0000e946.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE946 10528 bytes
SHA-256: 6f5aad733a906e491f21d6b7c90a2aedc2ef5202884858830667b9d72e4d0de1
font_01_sfnt_off00010124.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10124 18056 bytes
SHA-256: 684e7cd9946ea5885d96bacd82dab1307c7f4370b3dea4ce1824916840abdb93
font_02_sfnt_off00013004.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13004 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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