Malicious PDF — malware analysis report

Static analysis result for SHA-256 a4e88891607a6101…

MALICIOUS

PDF

69.5 KB Created: 2021-09-27 17:05:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 44e509686eefb8c0741ca2ca9cde10ad SHA-1: e829d2ef5930e49d9a5ec654e678a835546a0185 SHA-256: a4e88891607a6101ad8c4ef93206cc68ff64d5c8904f82f4c4f46be2f8726440
164 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised WordPress sites or disposable hosting, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The embedded JavaScript likely facilitates the redirection to these malicious sites, potentially for exploitation or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://infrive.ru/uplcv?utm_term=iphone+gba+roms+download PDF link annotation
    • http://tech-in.info/bramy/userfiles/file/pejoxisizuligugira.pdfIn PDF document text
    • http://cuacuonductudong.com/upload/files/retajagosapuwewi.pdfIn PDF document text
    • http://www.hypnotiseur.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139972a4b658---73022699415.pdfIn PDF document text
    • http://seksdagen.nl/userfiles/file/51412444387.pdfIn PDF document text
    • http://imagespa.mx/wp-content/plugins/formcraft/file-upload/server/content/files/16147c0c0e6798---23028589589.pdfIn PDF document text
    • http://dobryremont.pl/ebobas/portal/app/webroot/img/tmp/file/16315310888999.pdfIn PDF document text
    • http://bonfiremadigan.com/uploads/fckeditor/file/tusoz.pdfIn PDF document text
    • http://cortabellanews.com/userimages/malufenetoduju.pdfIn PDF document text
    • https://clumba-indoor.ru/files/files/jalunajeme.pdfIn PDF document text
    • http://medica-eg.com/userfiles/file/bapukigojetoma.pdfIn PDF document text
    • http://le-bouquet.be/userfiles/files/gowales.pdfIn PDF document text
    • http://rosabaum.de/web/editor/files/wetudulavidonagip.pdfIn PDF document text
    • https://www.golddustdental.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134d2936a78a---joxuruw.pdfIn PDF document text
    • http://productinfo.in/konadnew/userfiles/file/18376790469.pdfIn PDF document text
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/155f80e59799e8e5109427931cf7a554/nixif.pdfIn PDF document text
    • http://htbestcomputer.com/media/ftp/file/43034340207.pdfIn PDF document text
    • http://xn--d1achljw0b.xn--p1ai/content/upload/gulaposoboniwav.pdfIn PDF document text
    • https://valgott.com/images/userfiles/file/70407221694.pdfIn PDF document text
    • http://idolyokocho.com/js/ckfinder/userfiles/files/2688279057.pdfIn PDF document text
    • http://maxitelt.no/wp-content/plugins/formcraft/file-upload/server/content/files/1612ed7b7aecaf---35266648929.pdfIn PDF document text
    • https://kaparatt.com/images/File/xetutexibofadevotegaj.pdfIn PDF document text
    • https://cissud.it/uploads/ck_editor/files/wekimejowuruloto.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_off0000adb9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xADB9 10824 bytes
SHA-256: 6b63c457758ca4698a4400a3ea7587bdbbc55babf8149f1d2d2b16b2b0305e2b
font_01_sfnt_off0000c61b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC61B 16116 bytes
SHA-256: c60be84b6d953588fcbf75d71ed8259f35ba94357ade728d3a2918cb0099d953
font_02_sfnt_off0000ef33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF33 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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