Malicious PDF — malware analysis report

Static analysis result for SHA-256 2eedbc93e78680bd…

MALICIOUS

PDF

71.1 KB Created: 2021-09-01 22:44:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 9b8680a0e25ccfc4e52def8e23741024 SHA-1: fe6bb15500f5c1230a9806ab3f822daefb20d2e8 SHA-256: 2eedbc93e78680bd015e4c5d58cc2999683efa743e3487e43fcf4d02de1da75d
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many hosted on compromised WordPress installations, indicating a link farm or phishing lure. The ClamAV detection and ML classifier strongly suggest malicious intent, likely to redirect users to malicious content or facilitate further compromise. No scripts were extracted, but the PDF structure itself is used to host these malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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://suativisamsungtaihanoi.net/upload/files/43496948768.pdf In PDF document text
    • https://12shio2.com/contents//files/sobob.pdfIn PDF document text
    • http://akcjonariusz.com/UserFiles/file/nijusozopudexo.pdfIn PDF document text
    • https://autosofortkauf.ch/wp-content/plugins/super-forms/uploads/php/files/5fup92m96kb52r4vcablq337ol/57482753236.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160873050bcf5a---kufej.pdfIn PDF document text
    • https://www.lokalesichtbarkeit.de/wp-content/plugins/super-forms/uploads/php/files/mg22g4i9gh20u0fjempjapn8to/dugaxonaluxivosezaz.pdfIn PDF document text
    • http://www.heksan.com.pl/file/50130239839.pdfIn PDF document text
    • http://orchid-daikanyama.com/userfiles/file/vutiwixe.pdfIn PDF document text
    • http://chochosanencino.com/uploads/files/fibefapuvoj.pdfIn PDF document text
    • http://xn--3e0b556bhrbowi6undva.com/ckupload/files/kukegijagut.pdfIn PDF document text
    • http://getawaynewzealand.co.nz/wp-content/plugins/formcraft/file-upload/server/content/files/1611c436143850---88795686361.pdfIn PDF document text
    • https://yuktiedu.com/wp-content/plugins/super-forms/uploads/php/files/24004a590156a8053a296564da625f97/61444662562.pdfIn PDF document text
    • http://cocoal.com/uploads/file/mekovusu.pdfIn PDF document text
    • http://xn--80aafbanafwvcftiqfecrg2a.xn--p1ai/pict/file/81507740639.pdfIn PDF document text
    • http://iehyun.com/editorupload/file/dexujukomidemajanisisedup.pdfIn PDF document text
    • https://www.tctnanotech.com/wp-content/plugins/super-forms/uploads/php/files/daa4f319f1870afe7f2899cae54ab10c/direxu.pdfIn PDF document text
    • http://www.lightingandhvacexpo.com/wp-content/plugins/super-forms/uploads/php/files/fb9b739fb3a8145f4e782c029c4872e1/vemuxojagono.pdfIn PDF document text
    • https://shrmivirtual.org/wp-content/plugins/super-forms/uploads/php/files/0578d86df74193d713e1c6212a5bf97d/rupituvuzewefivabejidi.pdfIn PDF document text
    • http://stromzeleny.cz/file/sebubuvi.pdfIn PDF document text
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/9v2ntir17ssb4e6gmlqhofbof1/likezo.pdfIn PDF document text
    • https://fmpride.com/wp-content/plugins/super-forms/uploads/php/files/42be9413bf49b1b95f8b2e5b305a81c4/46414666247.pdfIn PDF document text
    • https://juhaszautovill.hu/userfiles/file/fotagew.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=canvas+numerical+answerPDF 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_off0000b76c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB76C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cf7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF7E 15720 bytes
SHA-256: eb332b107d0884fbae240097caa665a9fca9d129e66f0834f234d3af79c943d1
font_02_sfnt_off0000f7a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7A2 10456 bytes
SHA-256: 81a9ea53cdc8e1219d53069f9da1008a9c8ce1164cfe7ee3d3e1d1cef2e3d797

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