Malicious PDF — malware analysis report

Static analysis result for SHA-256 c1858c59ba0838dd…

MALICIOUS

PDF

101.7 KB Created: 2021-08-13 20:58:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: 9c0b6d0e0665e5105403d4fdbc1c3497 SHA-1: 0647dd56e3ac2c93b961294bc299beda254634f6 SHA-256: c1858c59ba0838ddb6cd0ce7e53a4c915fc2faabcf6eeb20695f6adb26f8667f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, directing users to potentially compromised websites that host further malicious PDF files. The presence of multiple links to disposable hosting and compromised CMS upload storage suggests an effort to distribute malware through a deceptive link structure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9900

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 http://sy-smile.com/upload/files/47868585558.pdf In PDF document text
    • http://www.alwaysflorida.com/wp-content/plugins/formcraft/file-upload/server/content/files/160874ba64d1f7---jeretorutesetuzo.pdfIn PDF document text
    • http://onnetsolution.in/userfiles/file/29773183644.pdfIn PDF document text
    • http://tuttotop.com/userfiles/files/11262589972.pdfIn PDF document text
    • http://targhevaticane.it/userfiles/files/duxafu.pdfIn PDF document text
    • https://marblobaths.ph/app/webroot/img/files/88522931436.pdfIn PDF document text
    • https://hoovermaids.com/wp-content/plugins/super-forms/uploads/php/files/44f17ef625a8ce2aed80050e48c1400f/fasilabal.pdfIn PDF document text
    • https://termofriz.rs//files/17824781736.pdfIn PDF document text
    • https://howardsteeves.com/wp-content/plugins/super-forms/uploads/php/files/d8817d0257db01b9aa90dd29e93a317b/pirilu.pdfIn PDF document text
    • https://xn--80adj7cxa.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/517c864154e4a16c30e0fe89c84712fe/dazesajaser.pdfIn PDF document text
    • http://www.onlinetemsilci.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ecd9f341c7---memaxanamenib.pdfIn PDF document text
    • http://www.luminicaambiental.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a82ba451c30---jiwavet.pdfIn PDF document text
    • https://shinyjewellers.com/wp-content/plugins/super-forms/uploads/php/files/hniev0at1mkc0kr2lao7lphg83/baluneritofutakusid.pdfIn PDF document text
    • http://thanhnhomdinhhinh.net/uploads/files/geman.pdfIn PDF document text
    • http://wang023spa.com/userfiles/202107file/2021070707465470554.pdfIn PDF document text
    • https://montpellier-business-plan.com/mbp/upload/images/images/upload/ckfinder/fidebewoj.pdfIn PDF document text
    • https://mattweidnerlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dd7727d9e06---lewarilaka.pdfIn PDF document text
    • https://fajanav.com/aym_image/files/xezapavasepiredozezapofa.pdfIn PDF document text
    • https://binarbaidfabrication.com/public_html/userfiles/file/19259218374.pdfIn PDF document text
    • https://completecollegestrategies.com/wp-content/plugins/super-forms/uploads/php/files/ebf81bc032dfdb27088df873ff899deb/26547310917.pdfIn PDF document text
    • http://bestpokeya.com/uploads/files/82887748181.pdfIn PDF document text
    • http://7tec.ru/userfiles/files/buposapevuvuguvidezu.pdfIn PDF document text
    • http://bilagroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609eb2d992626---buluxiravoxibimojumu.pdfIn PDF document text
    • http://tomlitkom.ru/ckfinder/userfiles/files/97121195432.pdfIn PDF document text
    • https://plentis.eu/ckfinder/userfiles/files/mopixugonepun.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=rider+waite+tarot+booklet+pdfPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010dd5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DD5 19936 bytes
SHA-256: 4e6423132b1a6f5c1518dc67c41f7e8e040496317e38c2cb449d95164f75334e
font_01_sfnt_off00014162.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14162 16164 bytes
SHA-256: fd494554c7a7a2c4488382a78096c535ff133766c7221992be4f6a58596b2467
font_02_sfnt_off000156d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x156D8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00016eef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16EEF 10584 bytes
SHA-256: 4011c22871d49896d8eb289aa198436d40f5bee2b2c9b5e887c6109617b40f65

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