Malicious PDF — malware analysis report

Static analysis result for SHA-256 8977ed7b6d42260d…

MALICIOUS

PDF

110.8 KB Created: 2021-07-03 07:08:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 49889d83e87d488c365d8e988dd54f0e SHA-1: 057db17d91287b37e9e4c752112ea3f7fdd7382f SHA-256: 8977ed7b6d42260dccb9cbb4f4a32139828e3cfb3d53091d4b4cfc4496be7d2c
172 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and multiple links pointing to compromised websites, suggesting an attempt to trick the user into downloading a malicious file. The ML classifier and ClamAV detection strongly indicate malicious intent. The presence of a download button lure further supports this phishing-like attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9886

Heuristics 8

  • 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.
  • 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 https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/48b3f9ae3f74f8137e039d1c2bfa0fd6/wexupegedototukexu.pdf In PDF document text
    • http://marketherballize.com/ckfinder/userfiles/files/dirid.pdfIn PDF document text
    • http://averon.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607ebf0ef3884---90108285161.pdfIn PDF document text
    • http://mariekevanvlierden.nl/survey/userfiles/files/rawupebifanitijeto.pdfIn PDF document text
    • http://taketty.xyz/js/ckfinder/userfiles/files/dakidaranukezotobidojije.pdfIn PDF document text
    • https://dermo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607eb6cce4042---figotisumoveri.pdfIn PDF document text
    • http://dnepropress.net/files/file/368767492.pdfIn PDF document text
    • https://www.duffylighting.com/wp-content/plugins/super-forms/uploads/php/files/e60a9940e7efbf8b32deb541a3971fb7/fapababerezasomupamuma.pdfIn PDF document text
    • https://nhaccugiare24h.com/uploads/userfiles/file/5170397059.pdfIn PDF document text
    • http://alicekhenrylawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/ziserajesopuwarulo.pdfIn PDF document text
    • http://www.consorcio.edu.pe/wp-content/plugins/formcraft/file-upload/server/content/files/160d872f1ea330---30160752354.pdfIn PDF document text
    • https://www.sixteengrams.com/wp-content/plugins/super-forms/uploads/php/files/hakaiq0ul0iqf86qo9iv2h2nnc/32461960298.pdfIn PDF document text
    • https://cuisinescartier.ca/upload/editor/file/47055021242.pdfIn PDF document text
    • http://polskienarty.pl/data/aktualnosci_imgs/file/texinezakojikuvelopo.pdfIn PDF document text
    • https://computerzone.pk/file/3382507545.pdfIn PDF document text
    • http://wbbray.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607449e2d1c17---vuzakazi.pdfIn PDF document text
    • https://amirep.com/wp-content/plugins/super-forms/uploads/php/files/50d892a713b232479069c29c1b7d360d/vexixajiro.pdfIn PDF document text
    • https://evg-prague.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1609d4fbb732dd---wibik.pdfIn PDF document text
    • http://brucemsmithlaw.com/clients/e/e2/e252bfde01ef004f685a9648d307a4b9/File/gezugumogatadamakoregu.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/xebipi.pdfIn PDF document text
    • http://lnshiyue.com/userfiles/file/20210620211615_655458363.pdfIn PDF document text
    • http://www.gainerwindows.ca/wp-content/plugins/super-forms/uploads/php/files/v58iglrhg2anq2p9ngspupkj94/pemolusa.pdfIn PDF document text
    • https://earplighting.com/wp-content/plugins/super-forms/uploads/php/files/0b9740c35d6918826480e3df450884ea/wikedubafomawog.pdfIn PDF document text
    • https://indacphuc.com/wp-content/plugins/super-forms/uploads/php/files/89n7aclaa6mmhmv262lf10bqcc/10303909620.pdfIn PDF document text
    • https://rescue.bg/wp-content/plugins/formcraft/file-upload/server/content/files/160c62a2e6a2b0---53475264808.pdfIn PDF document text
    • https://www.chauffeur-prive-nice.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1609c85439c488---7294320775.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=common+logical+fallaciesPDF 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_off00014ff5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14FF5 17564 bytes
SHA-256: c3408cc3276e94abe13ea1df7cf7ac04dd67f78307d6ea8b63d0d9f3f89c6716
font_01_sfnt_off00017dfc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17DFC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00019613.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19613 10512 bytes
SHA-256: 76faf347ed26ded05639e8a897d80aa48f458481b6dfd260fa552fb815467bb3

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