Malicious PDF — malware analysis report

Static analysis result for SHA-256 75d31cc2309000b5…

MALICIOUS

PDF

86.4 KB Created: 2021-08-05 03:45:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 1ac5ed04229de1c6bb57820f6f790eb1 SHA-1: 33f6eb88e770f03ec1a32b693406f5c11c1fe31f SHA-256: 75d31cc2309000b5cab7effc0ed047bf1c2db6dc9206c5dda47865bbab8dcf59
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as malicious by ClamAV and an ML classifier, with heuristics indicating embedded JavaScript and a link farm pointing to potentially compromised WordPress sites. The embedded JavaScript likely executes malicious code, and the link farm serves to obscure the ultimate destination, which is probably a phishing or malware distribution site. The presence of numerous unknown URLs suggests a broad attempt to distribute the malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://puertoestereo.com/wp-content/plugins/super-forms/uploads/php/files/omn4d6dotq7udbb31oug4nsumf/85937846146.pdf In PDF document text
    • http://claphamtaxi.com/survey/userfiles/files/kewez.pdfIn PDF document text
    • http://boschvietnam.vn/files/usersfiles/files/xemowutawevewanubowav.pdfIn PDF document text
    • https://debcopharma.com/userfiles/file/menilixapaguriguwog.pdfIn PDF document text
    • https://tasteadmin.com/ckfinder/core/connector/php/custom/wysi_uploads/files/8328862537.pdfIn PDF document text
    • https://alate.org/admin/fckeditor/editorfile/lipopinu.pdfIn PDF document text
    • https://galerie-louise.be/userfiles/files/wetesinago.pdfIn PDF document text
    • https://donnasalon.ru/wp-content/plugins/super-forms/uploads/php/files/d025e5ed0bcbe1ad516c15785e3ad6c5/jiposagegefigulapinonow.pdfIn PDF document text
    • http://zeminyerkaplama.com/upload/ckfinder/files/jukew.pdfIn PDF document text
    • http://melly-incendie.fr/img_db/25240741349.pdfIn PDF document text
    • http://unsersohn.ch/images/file/14627842021.pdfIn PDF document text
    • http://due.pt/js/ckfinder/userfiles/files/dutubifamopiperebefudulo.pdfIn PDF document text
    • https://www.higher-energy-trampolineclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/160de40baf3a0e---67138161700.pdfIn PDF document text
    • https://stka.gr/ckfinder/userfiles/files/71289360511.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/3p0f7a4gc7mlhg7afdq97s0o3m/91623011029.pdfIn PDF document text
    • http://alexandersorokolaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/15963334345.pdfIn PDF document text
    • http://ankurgroups.com/userfiles/file/bodusabitufediwavabuwido.pdfIn PDF document text
    • https://yingzhaoliuart.com/upload/file/munogok.pdfIn PDF document text
    • https://www.rekalibracija.com/wp-content/plugins/super-forms/uploads/php/files/7eb65d4286bac61ecde93e35c4cb811e/77729251556.pdfIn PDF document text
    • https://seataclightingalaska.com/wp-content/plugins/super-forms/uploads/php/files/5dc2d0d1686461eaf9961c43221ca0fe/vebokitusufuw.pdfIn PDF document text
    • http://lichnyiybrand.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160bad813145b3---kufulufadipelabegi.pdfIn PDF document text
    • http://55thocscompany.com/clients/62662/File/7069064351.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=spanish+affirmative+tu+commands+pagarPDF 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_off0000ebc3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBC3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000103d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103D5 17932 bytes
SHA-256: 2f1bfafa4d37e759aecf9006022edd3195b1bbfd8701539dd8cdcb18e0baebff
font_02_sfnt_off00013193.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13193 11264 bytes
SHA-256: d3d69199f96351107faec240240fe2515003edde4ed35ab82a5a950c6f8724e5

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