Malicious PDF — malware analysis report

Static analysis result for SHA-256 1e8da522b75335c2…

MALICIOUS

PDF

77.8 KB Created: 2021-10-18 06:29:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: e849ba376030cd079ba0ff92cae7e57b SHA-1: 671dc29faf4cd8e216fc16d3be7ad28f0dbace45 SHA-256: 1e8da522b75335c211e65b1be542f4261b1d940eba004455329016c25b3602f9
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external links, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to obscure the final destination. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware delivery. The embedded JavaScript is a common technique for executing malicious code within PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9829

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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://oniceh.ru/uplcv?utm_term=project+happily+ever+after PDF link annotation
    • http://www.patricktennis.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1614e4708541c9---wukol.pdfIn PDF document text
    • http://www.poliklinika-hb.cz/userfiles/file/25148158687.pdfIn PDF document text
    • http://ksiclubcom.ksiclub.org/svnprojects/DHD/Source/images/files/49301804415.pdfIn PDF document text
    • https://gkscam.com/userfiles/file/32666400675.pdfIn PDF document text
    • http://fishngrill.iorderfoods.com/uploads/files/jomeduzowepobex.pdfIn PDF document text
    • http://ambulatorioveterinariobubiniregini.eu/userfiles/files/2877524819.pdfIn PDF document text
    • http://hoanhaochemical.com/uploads/files/460938457.pdfIn PDF document text
    • https://toyotaautobody.com/ckfinder/userfiles/files/51646519454.pdfIn PDF document text
    • https://pyccenter.com/images/Upload/file/86379874438.pdfIn PDF document text
    • http://absolutelyneon.com/userfiles/file/lewivigigulim.pdfIn PDF document text
    • https://rh-h1tapi-turbo.com/contents/files/batamovufiwewesarepodi.pdfIn PDF document text
    • http://makesrealsense.com/ckfinder/userfiles/files/jabipedezedefigoxotonewit.pdfIn PDF document text
    • http://hakasasi.id/userfiles/file/kavidebesobeme.pdfIn PDF document text
    • https://beldapin.com/calisma2/files/uploads/12924654581.pdfIn PDF document text
    • http://salman-group.com/userfiles/file/38589628214.pdfIn PDF document text
    • http://jeansresource.com/js/ckfinder/userfiles/files/wiwikik.pdfIn PDF document text
    • https://wcdt.co.th/wp-content/plugins/super-forms/uploads/php/files/qa4c5ju8fum4r7tgvkng0631f4/mekupo.pdfIn PDF document text
    • http://tuvantindat.com/uploads/2021-09-26/images/files/15782660208.pdfIn PDF document text
    • http://antonio-pelella.eu/userfiles/files/95296509359.pdfIn PDF document text
    • http://cadelupo.it/userfiles/files/tosobiwilifow.pdfIn PDF document text
    • http://tongshengchem.com/ckfinder/userfiles/files/varumodedetem.pdfIn PDF document text
    • https://www.winsum.frl/ckfinder/userfiles/files/35350946528.pdfIn PDF document text
    • https://hotelangela.hu/userfiles/file/71769341567.pdfIn PDF document text
    • http://gsoam.ge/wp-content/plugins/formcraft/file-upload/server/content/files/161409e397cfc3---kisajik.pdfIn PDF document text
    • http://christmaslandint.com/userfiles/wujumurarele.pdfIn PDF document text
    • https://kawinlari.com/contents/files/42813426883.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_off0000cd78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD78 10616 bytes
SHA-256: 5ba45731d1fae6b1e6335bea06d7b3d0c56c073e5e935fb3003c64ed4698a227
font_01_sfnt_off0000e5d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5D9 17156 bytes
SHA-256: 708112481dc36d46e25ec2424532d4d7e02de859a269fbe64f23a246c74b59fe
font_02_sfnt_off0001115d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1115D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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