Malicious PDF — malware analysis report

Static analysis result for SHA-256 e9603e4745f3d56b…

MALICIOUS

PDF

85.0 KB Created: 2021-07-03 13:53:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: 2c8be60e8dcf2d5f5246a8728bb482e8 SHA-1: 9b4892298a6813dd28272e31f9eb71019395bb4f SHA-256: e9603e4745f3d56be9599d278624ced6f620abc5265f76ff99318a04b9ae1c8a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, with numerous URLs pointing to compromised CMS upload directories. These links likely serve as lures for phishing or to distribute further malware payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

Heuristics 6

  • 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 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://pinotcar.com/wp-content/plugins/super-forms/uploads/php/files/6e0e1da86377ad4314c61a58dfaea70a/18531169528.pdf In PDF document text
    • https://diversified-nj.com/wp-content/plugins/super-forms/uploads/php/files/938ac5e74853f1dfd47f4f745d24c8e1/32202614638.pdfIn PDF document text
    • http://cleanyachts.it/writable/public/userfiles/file/47289639097.pdfIn PDF document text
    • http://from.ua/upload/articles/2021/06/18/files/30159434353.pdfIn PDF document text
    • https://cabsfromheathrow.com/userfiles/file/damusoxutozikaropopo.pdfIn PDF document text
    • https://socohoteldanang.com/uploads/image/files/linuxelekevewumazuxesero.pdfIn PDF document text
    • https://ontime-taxi.kg/wp-content/plugins/super-forms/uploads/php/files/3b0dc577893e99b0dac1da139c506228/foganobu.pdfIn PDF document text
    • http://zoncmswebsitebeheer.nl/files/editor/file/26717744241.pdfIn PDF document text
    • http://festivaldeliteraturadepereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/160813463907a9---74792158179.pdfIn PDF document text
    • http://titusrelay.com/clients/e/ef/ef304ccc03541e9e6382bef5f13b0a7d/File/59900628995.pdfIn PDF document text
    • https://www.duffylighting.com/wp-content/plugins/super-forms/uploads/php/files/36496dea4da55a1fd29e45a4b989172f/4000625713.pdfIn PDF document text
    • https://3dreamvr.com/wp-content/plugins/super-forms/uploads/php/files/3664826c0f56aadaf4fe3e5414a8dc75/28584923386.pdfIn PDF document text
    • https://hkparkkonutlari.com/image/files/49091617378.pdfIn PDF document text
    • https://bgmediation-flm.com/userfiles/file/45508897529.pdfIn PDF document text
    • http://bilagroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607215c19bc04---47917791980.pdfIn PDF document text
    • https://www.caesarstravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160907110d2546---46276593137.pdfIn PDF document text
    • http://ei-windykacja.pl/upload/file/lukuni.pdfIn PDF document text
    • https://creativesilhouettes.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160c9b12859447---nevuvoxokafijebava.pdfIn PDF document text
    • http://dolphinkorea.com/files/files/gazigeken.pdfIn PDF document text
    • http://pelesiuvalymas.lt/i/File/11515497213.pdfIn PDF document text
    • https://zoldlepes.hu/userfiles/file/jexif.pdfIn PDF document text
    • https://vdbergelectro.nl/wp-content/plugins/super-forms/uploads/php/files/bc3cf8b56eadac5f6b0f1d649583e864/sirokex.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=what+is+my+niece%27s+son+to+mePDF 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_off0000ea93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA93 17308 bytes
SHA-256: dc1dd52793c4bef3d8479efa07ed3c88fd2752d999f82c87d368a1f4bc571f2a
font_01_sfnt_off0001177a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1177A 10488 bytes
SHA-256: 7e1e01e7aaa3a9c14bd456526f9fd5aa1fd344e3ad02d69bbc535d0f32d8d6d5
font_02_sfnt_off00012f4a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F4A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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