Malicious PDF — malware analysis report

Static analysis result for SHA-256 96ae9e4974d20994…

MALICIOUS

PDF

80.0 KB Created: 2021-09-23 11:55:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 9f8e4bc07e82a043a5ecd155c211dae3 SHA-1: 6d4df0d9b0902af327f1b6e4a489c1be8e21e583 SHA-256: 96ae9e4974d20994b1438c0b5e4ec22665e8cf4c98dec085e81e6acd4117e861
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and numerous external URIs, many of which point to compromised WordPress sites or disposable hosting, forming a link farm. This suggests the document's primary purpose is to redirect users to malicious content, likely other malicious PDFs or phishing pages, as indicated by the 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' heuristics. The ML classifier and ClamAV detection strongly support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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 http://alacartedesign.de/userfiles/file/45000207443.pdf In PDF document text
    • http://arhive.np-sp.ru/img/file/22354411097.pdfIn PDF document text
    • https://socialacademy.gr/wp-content/plugins/super-forms/uploads/php/files/4326443cf437ec700b0ea161b61695e9/fikijux.pdfIn PDF document text
    • http://myapartment.de/web/editor/files/wudevuwodutowureromov.pdfIn PDF document text
    • http://www.platformliften.info/wp-content/plugins/formcraft/file-upload/server/content/files/16138fb6b819c9---99789172381.pdfIn PDF document text
    • http://boracayg.com/FileData/ckfinder/files/20210922_EFC83274AE692D3B.pdfIn PDF document text
    • http://musiclivemarsala.com/userfiles/files/temimonavulazepezolalogol.pdfIn PDF document text
    • https://propiedades.net/ckfinder/userfiles/files/74605238856.pdfIn PDF document text
    • http://erfanekeshmiri.ir/userfiles/file/meralafejizewolajenuxido.pdfIn PDF document text
    • https://argekaucuk.com/nbg/upload/files/45848529983.pdfIn PDF document text
    • http://suaups.net/userfiles/file/vomidagi.pdfIn PDF document text
    • https://n95america.com/wp-content/plugins/super-forms/uploads/php/files/79bd4bdba4f5cc60febca86255a64438/84531303538.pdfIn PDF document text
    • https://i-intelli.com/ckfinder/userfiles/files/57340115355.pdfIn PDF document text
    • https://brincandoeaprendendo.com/fotosempresa/files/gunubesililulege.pdfIn PDF document text
    • http://revize-elektro.info/UserFiles/File/movixoled.pdfIn PDF document text
    • http://algarestofos.pnh.pt/js/ckfinder/userfiles/files/55015879871.pdfIn PDF document text
    • http://www.mariabeckmann.com/fotos/uploads/files/luromome.pdfIn PDF document text
    • https://www.pactforfamilies.org/ckfinder/userfiles/files/89314642770.pdfIn PDF document text
    • https://shiokuda2.com/contents/files/wodowujigusite.pdfIn PDF document text
    • http://mirembeestate.co.ug/wp-content/plugins/formcraft/file-upload/server/content/files/16134f039e40c5---tobejejopulivate.pdfIn PDF document text
    • https://griby.biz/ckfinder/userfiles/files/darobo.pdfIn PDF document text
    • https://heks-tech.com/app/webroot/userfiles/files/42936987296.pdfIn PDF document text
    • http://oumkua.com/userfiles/file/zasutojadozepek.pdfIn PDF document text
    • http://cachnhietwin.com/luutru/files/7955142910.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=programming+logic+and+design+pdf+downloadPDF 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_off0000d426.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD426 10952 bytes
SHA-256: 9021f2c29d7d851c5dc40dc68cd8e901149d2f396e9b7d820fb95c508c0a963d
font_01_sfnt_off0000ed5b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED5B 17360 bytes
SHA-256: 418c46b0f12d398f758b7a03d80b212fbf82695ea744bd6e47edb177003f6801
font_02_sfnt_off00011a59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A59 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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