Malicious PDF — malware analysis report

Static analysis result for SHA-256 1d33fefb5383db19…

MALICIOUS

PDF

69.3 KB Created: 2021-09-16 08:52:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 0ccb19f6f2f9c1f198665388fefef18e SHA-1: ca12eb4028a3bd4aefdb4d8e48336448f4ee1ecd SHA-256: 1d33fefb5383db190c26387f205234e966c1d899b701e373e8a8f6b50abe6045
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The PDF is identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a phishing lure. Heuristics indicate it's an image-only document with a click-outward action, typical for hiding malicious links. Multiple URLs were extracted, some pointing to compromised CMS upload storage, suggesting an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 1 text block(s), carries a click-outward action, and is only 69 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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.
  • 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://dongphat.net/upload/files/fotadoz.pdf In PDF document text
    • http://ngoinvest.com/uploads/ckfinder/files/4056372693.pdfIn PDF document text
    • http://ksiclubcom.ksiclub.org/svnprojects/DHD/Source/images/files/pobapen.pdfIn PDF document text
    • https://airbays.com/userfiles/file/valesejome.pdfIn PDF document text
    • http://materialdeestudo.top/userfiles/files/596929800.pdfIn PDF document text
    • http://www.jindatunnel.com/up_files/file/luzotesoxukazebajoxedipi.pdfIn PDF document text
    • http://vngo-cc.vn/cooker/public/files/85544902917.pdfIn PDF document text
    • https://www.frankcapassoandsons.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ba0278af85---33842193412.pdfIn PDF document text
    • https://pabausa.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613675632010a---11876866649.pdfIn PDF document text
    • http://accessiblevehicleservices.com/userfiles/file/nivokifupesinividezetum.pdfIn PDF document text
    • https://amesmedicalservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141201160e21---39823508174.pdfIn PDF document text
    • http://aktifbant.com/resimler/files/42695989165.pdfIn PDF document text
    • http://iccarrentals.com/files/file/zijudiw.pdfIn PDF document text
    • http://myxroad.net/upload/userfiles/file///61093296477.pdfIn PDF document text
    • https://ipekyolumedya.com/resim_galeri/file/jogotezelun.pdfIn PDF document text
    • http://zsmnowakowski.pl/userfiles/file/vunusifovunatijog.pdfIn PDF document text
    • http://paulabenveniste.com/UserFiles/file/zuvovokexofixuwafixipuduf.pdfIn PDF document text
    • http://actybrain-consult.com/Upload/files/bagibeladirepepabil.pdfIn PDF document text
    • https://washlounge.in/ckfinder/userfiles/files/56532953588.pdfIn PDF document text
    • https://bishopsalamatkhokhar.org/userfiles/file/jexodoxodupi.pdfIn PDF document text
    • http://fujieshubao.com/zk/UploadFile/file/2021090920041273499.pdfIn PDF document text
    • http://dlabiura.kbo.pl/ckfinder/userfiles/files/dumutunugogusab.pdfIn PDF document text
    • https://ijmscr.com/ckfinder/userfiles/files/24240506894.pdfIn PDF document text
    • https://balance-global.com/wp-content/plugins/super-forms/uploads/php/files/ata4nvk6vd3nol4d5h5uej11d0/kuwuvibawepenodu.pdfIn PDF document text
    • http://www.kigimex.com.vn/ckfinder/userfiles/files/22886824256.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=webfreer+for+android+free+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_off0000b499.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB499 14204 bytes
SHA-256: d9cd507320fc977a60249671e5846a6413332aa74c111a281c78e4c7741ed313
font_01_sfnt_off0000d7c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7C3 10300 bytes
SHA-256: 787faffb6da5fc9047bf27c4e36a8ad2e7ecfe20611167648a224e196b7b2620
font_02_sfnt_off0000ef13.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF13 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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