Malicious PDF — malware analysis report

Static analysis result for SHA-256 e506cd86d84a2315…

MALICIOUS

PDF

76.3 KB Created: 2021-09-24 12:12:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 4c18dacbd0dc93ecba242e31d0c3e1a7 SHA-1: ba008e81072d24f7a9a1e0559b047d764426739f SHA-256: e506cd86d84a2315f6cd5438ea8caeceb4f4a1dab73dc54bfba80410e1b2c644
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. It contains embedded JavaScript and numerous external URLs, many hosted on compromised CMS uploads or disposable domains, suggesting it is used to download and execute a secondary payload. The presence of JavaScript points to an attempt to exploit PDF vulnerabilities or deliver malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 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 https://philabc.ru/uplcv?utm_term=today+french+league+matches PDF link annotation
    • http://go-pxl.com/uploads/files/dodikaluruvejaniwatekib.pdfIn PDF document text
    • https://elicopter-de-inchiriat.ro/wp-content/plugins/formcraft/file-upload/server/content/files/161324a5f38505---46721112418.pdfIn PDF document text
    • http://grandp.ru/userfiles/file/64174051204.pdfIn PDF document text
    • http://fcvperu.org/data/fcvperu/userfiles/file/61570694373.pdfIn PDF document text
    • http://ctmmaximoravenna.com/ckfinder/userfiles/files/72454931755.pdfIn PDF document text
    • http://www.ville-civaux.fr/admin/js/ckfinder/userfiles/files/sipipufumevubitigufek.pdfIn PDF document text
    • https://www.lorenzofranzone.it/wp-content/plugins/super-forms/uploads/php/files/9089fa8bc0c8fad90d581cfd759aee03/2007671341.pdfIn PDF document text
    • http://ecoaga.com/documentos/file/76405479636.pdfIn PDF document text
    • http://arcdesantmarti.com/biocop/Images/images-editor/file/84112669291.pdfIn PDF document text
    • http://studiofapas.it/userfiles/files/penivunuxelevofuvokewoka.pdfIn PDF document text
    • http://leruichem.com/upload/files/xolojapokewe.pdfIn PDF document text
    • http://theofficefurniturestore.com/ckfinder/userfiles/files/84445016304.pdfIn PDF document text
    • http://2safe4u.cz/UserFiles/File/tudixonezonikup.pdfIn PDF document text
    • https://emilline.dk/ckfinder/userfiles/files/34999047700.pdfIn PDF document text
    • https://vitanov.rs/files/janumukowirabazuwoba.pdfIn PDF document text
    • https://esperanzadeavila.com/fotos/file/24522219410.pdfIn PDF document text
    • https://tpijobportal.com/ckeditor/ckfinder/userfiles/files/78070030493.pdfIn PDF document text
    • http://sonnenheizung.ch/fckeditor/editor/images/file/1498372651.pdfIn PDF document text
    • http://blueleaves.ru/userfiles/file/17237901541.pdfIn PDF document text
    • http://internet-trade.eu/UserFiles/file/bimivosejuse.pdfIn PDF document text
    • http://gomientrung.vn/uploads/image/files/gadarexugezudaguretu.pdfIn PDF document text
    • https://beautifullifeuk.com/wp-content/plugins/super-forms/uploads/php/files/25458ce798130c43bf7a12adc5ab947c/feluvegedosuzuxepowefeku.pdfIn PDF document text
    • http://decamiones.com/userfiles/file/83905974508.pdfIn PDF document text
    • http://balmybnb.com/t/tutorfirm/uploads/ck/files/27168251478.pdfIn PDF document text
    • 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_off0000c39f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC39F 11008 bytes
SHA-256: 2abe51cd4bb5aa700896f1b345b93bd05564e95a8b681e0250005f6b14b7fa55
font_01_sfnt_off0000dcd9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCD9 17896 bytes
SHA-256: 1f69c055e10571bdced5038225dcf9976b23d17c91cd0fd02a273638edddba35
font_02_sfnt_off00010b6f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B6F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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