Malicious PDF — malware analysis report

Static analysis result for SHA-256 77035569be9d77a7…

MALICIOUS

PDF

80.8 KB Created: 2021-09-05 07:47:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: e5de06788061002c89ddba51474c9b26 SHA-1: 5244ea30c307f883c9600a2be72f4510c56a61f0 SHA-256: 77035569be9d77a7598a9977f07d7a58d7dcc46b70def9311a0990d30c0a3974
172 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file detected as malicious by ClamAV and an ML classifier. It contains embedded JavaScript, which is often used to download and execute further payloads or redirect users to malicious websites. Several heuristics indicate the PDF is part of a link farm, with many URLs pointing to compromised CMS uploads or disposable hosting, suggesting an attempt to distribute phishing content or malware. The presence of a download button lure further supports a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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 http://noithatlekhanh.com/Images_upload/files/75485097557.pdf In PDF document text
    • http://depcip.com/app/views/panel/ckfinder/userfiles/files/jozarofiz.pdfIn PDF document text
    • http://karmand24.ir/basefile/ehotel724ir/files/sotujibokafavosaxidoma.pdfIn PDF document text
    • http://galluccifaibano.com/userfiles/file/48626059613.pdfIn PDF document text
    • http://www.191seo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c4d5de93ba7---tomikuvofijekogegom.pdfIn PDF document text
    • https://alihuata.com/userfiles/file/gorakagusep.pdfIn PDF document text
    • https://rhuyscampingcar.fr/images/files/devebixup.pdfIn PDF document text
    • http://baanpowertrain.com/wp-content/plugins/formcraft/file-upload/server/content/files/160da18a763403---wavigozukimajaxagifefubix.pdfIn PDF document text
    • http://thanhlapcongtykiengiang.com/upload/ck/files/23346543455.pdfIn PDF document text
    • https://sport-jicin.cz/dokumenty/gixuf.pdfIn PDF document text
    • https://www.revistadefiesta.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ea3fe314b4---jenasesavigi.pdfIn PDF document text
    • https://kientrucqhouse.com/uploads/image/files/texujuzuwegoloseleradajak.pdfIn PDF document text
    • http://high-keenltd.com/userfiles/file/vokesosavotovafo.pdfIn PDF document text
    • http://abwgulfport.com/uploads/files/87161516874.pdfIn PDF document text
    • http://01host.ru/userfiles/files/mivabogijuwifixinov.pdfIn PDF document text
    • http://stl-hk.net/userfiles/lusatomar.pdfIn PDF document text
    • http://okuninka-biale.pl/userfiles/file/80509402536.pdfIn PDF document text
    • https://www.andimoda.com/wp-content/plugins/super-forms/uploads/php/files/81d420485368e95cc13eb148a0845547/judigenubanevixetuwesus.pdfIn PDF document text
    • http://wrtour.com/FileData/ckfinder/files/20210601_5E30ED8D19425847.pdfIn PDF document text
    • http://logopeda-empatia.pl/content/file/wexafabijo.pdfIn PDF document text
    • http://rama-sp.com/rama/webroot/js/ckfinder/userfiles/files/41742193574.pdfIn PDF document text
    • http://portalinmobiliario24.com/uploades/fckeditorfile/nunodonoj.pdfIn PDF document text
    • http://businessdevelopmentcenter.pl/uploads/userfiles/files/towuretudetefira.pdfIn PDF document text
    • https://balajihighfields.in/userfiles/file/48891021321.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=download+aplikasi+merubah+word+ke+pdf+offlinePDF 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d558.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD558 18084 bytes
SHA-256: b7a705a8bd5428b58aeb9f0804f303c62b8f232efb5f72228a88e812878f4792
font_01_sfnt_off000103ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103ED 11084 bytes
SHA-256: ad13fbc81d1674771a95834a285ffbf47ed2009f7e7c1f758d07636cc5a39e68
font_02_sfnt_off00011d54.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D54 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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