Malicious PDF — malware analysis report

Static analysis result for SHA-256 fc6a8a03843ebb65…

MALICIOUS

PDF

86.8 KB Created: 2021-09-01 01:16:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 37becbc526c1906b5f1068b3c1fc83a7 SHA-1: b32e2456b13a0cfc2d0cdc2bac41c32017d96d3a SHA-256: fc6a8a03843ebb65c95bf32a696d3086820b531fd51e9dbad0fc0ac661a70edf
156 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 phishing or trojan threat. It contains numerous URLs, many hosted on compromised CMS platforms, suggesting it functions as a link farm to distribute malicious content or phish users. The presence of embedded URLs and the nature of the heuristics point towards an attempt to redirect users to external, potentially harmful, websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 6

  • 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 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://huntic.ru/uplcv?utm_term=roller+coaster+personification PDF link annotation
    • https://bluetact.com/locktactyuma/userfiles/file/motebalonojenaforebav.pdfIn PDF document text
    • https://hyundaia.ru/userfiles/file/natada.pdfIn PDF document text
    • https://oknoplus-omsk.ru/wp-content/plugins/super-forms/uploads/php/files/9fd45575b76c37fcae25c8521f5a75fb/99467316820.pdfIn PDF document text
    • http://cityhighclassof77.com/clients/9/9e/9ea685038b5a197d2022a69b8c6b162a/File/zifanukovonaxozoxu.pdfIn PDF document text
    • https://2greenchicks.com/wp-content/plugins/super-forms/uploads/php/files/55b2fb76b467e8a6375b569811c3fc65/44056487231.pdfIn PDF document text
    • https://miamivanservice.net/wp-content/plugins/formcraft/file-upload/server/content/files/160e2d00683f42---bulaketelexaleguw.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608406595930c.pdfIn PDF document text
    • http://bsp-oblspl.org/ckfinder/userfiles/files/jisuxunupevu.pdfIn PDF document text
    • https://k-newsletter.com/ckupload/files/remukululonuvegulisexi.pdfIn PDF document text
    • http://skrabl.pl/www/rpbd/fck/file/rutavusox.pdfIn PDF document text
    • http://ibshop.gr/uploads/_uploads/files/96910487275.pdfIn PDF document text
    • https://www.waterlooarmsnewforest.co.uk/wp-content/plugins/super-forms/uploads/php/files/271db7adf71db54d519c29faebada6ec/gezixudijaxixiz.pdfIn PDF document text
    • http://momsystem.ru/public/file/misomexagorukibeduzegato.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/27175376065.pdfIn PDF document text
    • https://qamarapps.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612139d5b43e7---najafulo.pdfIn PDF document text
    • http://www.lightingandhvacexpo.com/wp-content/plugins/super-forms/uploads/php/files/41d392e76e3f13143c6e1ce49daaf131/wifelufivivepabon.pdfIn PDF document text
    • https://creationstationdance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba674116bc0---lelidupaxitedukoxebipapoj.pdfIn PDF document text
    • https://intekcanada.com/ckfinder/userfiles/files/kikokadobuvogasopufe.pdfIn PDF document text
    • http://socialbomjesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/16072139b17d1b---68961768117.pdfIn PDF document text
    • https://yarsan.ru/wp-content/plugins/super-forms/uploads/php/files/49c01e7a29aaa9748bbdac9c09255fd6/19916962724.pdfIn PDF document text
    • http://projectbudapest.hu/wp-content/plugins/formcraft/file-upload/server/content/files/16091467be954a---vulunoxigoz.pdfIn PDF document text
    • http://orkoien.com/userfiles/files/sepupefina.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/161008bcc93eff---xonofo.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_off0000ea6f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA6F 10516 bytes
SHA-256: 81519b6d48d337af675fe53dd66192df27c69109b8355cc476a8afdc030ce4ac
font_01_sfnt_off0001027e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1027E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011a90.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A90 19156 bytes
SHA-256: 0cf66d952b689fd32bf29f16e6f1737c811bf3b8dd8d6f211b67264b8cec9dbb

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