Malicious PDF — malware analysis report

Static analysis result for SHA-256 be884d79ca8ccf27…

MALICIOUS

PDF

75.7 KB Created: 2021-09-10 21:43:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: f931f39a426d11fa8705d4ff25052e83 SHA-1: 5176cc48d3dc5598fd6907f0e5ae9bc77d050091 SHA-256: be884d79ca8ccf27f8961666d34aeef3486599fba95dfc579ec7f2a26d379cb8
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains embedded JavaScript and numerous links to external URLs, many of which are hosted on compromised websites or disposable domains. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of embedded JavaScript suggests an attempt to execute code or redirect the user to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

Heuristics 8

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://irlanc.ru/uplcv?utm_term=i+am+paul+walker+online+free PDF link annotation
    • http://newgrids.com/userfiles/file/tedugegiboxukusojirabire.pdfIn PDF document text
    • https://massagetheory.ca/wp-content/plugins/super-forms/uploads/php/files/90f42473ff19469d84666adb446f0544/dujis.pdfIn PDF document text
    • https://kaparatt.com/images/File/86110489039.pdfIn PDF document text
    • http://vetranhtuong.info/luutru/files/31161133718.pdfIn PDF document text
    • https://k31szmq42-nu28.com/contents/files/noletogojarobi.pdfIn PDF document text
    • https://wietsevoermans.nl/ckfinder/userfiles/files/31037555085.pdfIn PDF document text
    • http://startent.ru/SITE/files/editor/file/32287134818.pdfIn PDF document text
    • http://theydeserveastamp.org/wp-content/plugins/formcraft/file-upload/server/content/files/16135dcb727d84---tigivukilumuzagexipotof.pdfIn PDF document text
    • https://parc-hotel.info/file/wewevikubisasudodoso.pdfIn PDF document text
    • http://taiwan-tsai.com/upload/files/36510154823.pdfIn PDF document text
    • https://interior-mark.com/ckfinder/userfiles/files/92341594777.pdfIn PDF document text
    • http://carraracucinecomponibilitrapani.it/userfiles/files/397949838.pdfIn PDF document text
    • https://gyn-koe70.de/obrazky/file/9742257689.pdfIn PDF document text
    • http://cppzone.ru/users/blogs/file/depolumepok.pdfIn PDF document text
    • http://xprchemical.com/upload/files/67302198803.pdfIn PDF document text
    • http://cuanhuaabshanquoc.vn/files/kunimaxetatazelenazi.pdfIn PDF document text
    • https://giltmorestukko.hu/ckfinder/userfiles/files/sadavibawom.pdfIn PDF document text
    • http://kompassztuki.pl/Image/files/61789554635.pdfIn PDF document text
    • https://www.cfo-search.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133c5d28676f---bizozusixidumotalalatifal.pdfIn PDF document text
    • http://dok-vo.ru/userfiles/file/wisegotufaj.pdfIn PDF document text
    • https://nawaasha.org/userfiles/file/63119419914.pdfIn PDF document text
    • http://jshtextile.com/UserFiles/file///61544352768.pdfIn PDF document text
    • https://jmtours.co/aym_image/files/xolevolekolalagigenoj.pdfIn PDF document text
    • http://robertoantoniz.com/resources/original/file/4907596916.pdfIn PDF document text
    • http://77owship.netsociality.com/upload/files/75577657149.pdfIn PDF document text
    • https://sensormaticltd.com/app/templates/js/ckfinder/userfiles/files/kufenalub.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_off0000c518.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC518 17180 bytes
SHA-256: a9ef456745a6a4c71a3be9da3080453bfc6ccc6cbba8934c570d9dd6bb380971
font_01_sfnt_off0000f1a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1A1 10484 bytes
SHA-256: 8ecca055c4725e50ec6fb2333c7a7fc5b11e116bde79fbb8298cc2837fe47fd0
font_02_sfnt_off00010968.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10968 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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