Malicious PDF — malware analysis report

Static analysis result for SHA-256 8043859a77533097…

MALICIOUS

PDF

85.4 KB Created: 2021-09-10 20:08:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: ecc8ff66e9def5f21506c19edc7d032e SHA-1: 405429726a2895ee2594045d784ba2244fb2b1fc SHA-256: 8043859a775330972939f41502f9ef995e3a24ac83f8eb547e5494b12227d466
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains embedded JavaScript and numerous external URIs, many of which point to disposable hosting or compromised CMS upload directories, suggesting it functions as a link farm to distribute further malicious content. The presence of embedded JavaScript indicates an attempt to execute code within the PDF viewer.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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
  • 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 http://phamtrangia.site/upload/files/28193618984.pdf In PDF document text
    • http://synagoge-stommeln.de/ckfinder/userfiles/files/85660213875.pdfIn PDF document text
    • https://pasationtravellers.com/root/FCKeditor/file/18353628286.pdfIn PDF document text
    • http://stin-verdon.fr/assets/Image/files/51477455376.pdfIn PDF document text
    • https://estidevelopers.com/wp-content/plugins/super-forms/uploads/php/files/dbf20b11c8ab9b08f168ca5dcc76e018/bijibapelaxenawatafuwe.pdfIn PDF document text
    • http://isystem.hu/userfiles/file/pomiw.pdfIn PDF document text
    • http://55pluscommunityspecialist.com/userfiles/files/zibom.pdfIn PDF document text
    • http://www.whirlpool-beachcomber.at/wp-content/plugins/formcraft/file-upload/server/content/files/161374e8bd9761---lamijivazu.pdfIn PDF document text
    • http://seto.cz/uploads/81158889755.pdfIn PDF document text
    • https://gkatsov.com/userfiles/file/20784177906.pdfIn PDF document text
    • https://alzubidi.com/userfiles/files/xabidepalujiwuz.pdfIn PDF document text
    • https://luathoanghuy.com/uploads/files/vezatatubasego.pdfIn PDF document text
    • https://www.bluegreenshouseboats.in/wp-content/plugins/formcraft/file-upload/server/content/files/16134a0e0bfb4b---71948750531.pdfIn PDF document text
    • https://livbiopharma.com/userfiles/file/25624450605.pdfIn PDF document text
    • https://www.naabelectric.com/userfiles/files/5812640450.pdfIn PDF document text
    • https://awinresource.com/uploadfile/file/jokirenebumoxixaju.pdfIn PDF document text
    • http://timebank.ru/sites/default/files/photos/pagefile/vusivozozet.pdfIn PDF document text
    • https://sealskinz.ru/files/file/73688612510.pdfIn PDF document text
    • http://mid-europe-ex.com/images/blog/file/14517235773.pdfIn PDF document text
    • https://www.agro-zavod.ru/app/webroot/js/ckfinder/userfiles/files/xisexejekivex.pdfIn PDF document text
    • http://gewoongroen.eu/app/webroot/files/userfiles/files/gopofalixibemupeb.pdfIn PDF document text
    • http://519pf.com/userfiles/files/51147789224.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=quiet+place+2+watch+online+hdPDF 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e851.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE851 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010068.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10068 10708 bytes
SHA-256: bf441f5c97ac39f429d86667261e9322c4ac9ec5a04b3802625ce96156da7672
font_02_sfnt_off0001191a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1191A 18176 bytes
SHA-256: 4d1f5a472c0ebe0d6fa2d214d30681ccd899bc45cf6ba5918eb713b301138055

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