Malicious PDF — malware analysis report

Static analysis result for SHA-256 71e6378632c41240…

MALICIOUS

PDF

70.4 KB Created: 2021-09-26 19:55:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 0a89c7a909769eb4fb5586b679de4c23 SHA-1: 1dfa8cd693472bd3943677a947f8d44e0e1de8b4 SHA-256: 71e6378632c41240af049a9968a58ead259251fe6c492d75554c67aac40ddf6b
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress upload directories. The ML classifier and ClamAV detection strongly indicate maliciousness, with ClamAV identifying it as Pdf.Phishing.Trojan. The file's structure suggests it's designed to lure users to external sites, likely for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

Heuristics 6

  • 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.
  • 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://www.higher-energy-trampolineclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141a99672350---31911804948.pdf In PDF document text
    • https://mollis.rs/files/bolajetanalofejibuseg.pdfIn PDF document text
    • https://trinityautorepairs.com/uploads/files/36801190380.pdfIn PDF document text
    • http://hocomesun.com/upload/kogikutiva.pdfIn PDF document text
    • https://tidurmalam.com/contents/files/89503279444.pdfIn PDF document text
    • http://xn--22cjbbm2eyae3ehabdb4kqdtae3dxnnc1fhf.com/user_img/files/47730094964.pdfIn PDF document text
    • http://dodogs.ru/sites/default/files/file/95240942740.pdfIn PDF document text
    • http://vdadanang.vn/app/webroot/assets/files/34103239924.pdfIn PDF document text
    • https://hotararicedo.ro/files/files/wijitaredakerazid.pdfIn PDF document text
    • http://ideatity.com/ckfinder/userfiles/files/30111373426.pdfIn PDF document text
    • http://www.gametimecatering.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613809587495a---xesugumeluzanu.pdfIn PDF document text
    • https://tonymusic.se/UserFiles/files/fajavofapedijafexu.pdfIn PDF document text
    • http://ginzaoakland.com/uploads/files/gapudujobofud.pdfIn PDF document text
    • http://sin-hua.org/userfiles/zuwegero.pdfIn PDF document text
    • http://jjburgerut.com/uploads/files/dofatovoralunadodixivoza.pdfIn PDF document text
    • http://aaas.handyfriendship.com/upload/files/laposexugonemitupa.pdfIn PDF document text
    • https://larrialdiak.es/files/galeria/files/vofopufed.pdfIn PDF document text
    • https://ppuhperspektywa.pl/files/edytor/file/90730013675.pdfIn PDF document text
    • https://technok.cz/wp-content/plugins/super-forms/uploads/php/files/c06e43b636c2fcdd3d54fb46d4eeec9e/kupif.pdfIn PDF document text
    • http://xn--pr3b03lcdvwu9dpynqkc.com/DATA/file/20210914102333.pdfIn PDF document text
    • http://wsystem.sk/userfiles/files/18531359498.pdfIn PDF document text
    • https://fivetc.net/uploads/files/doludamidonanizofima.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=sharn+city+of+towers+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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000af47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF47 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c759.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC759 17056 bytes
SHA-256: a1ab80574a897b45eab20a800f71a93eb5a001d7123f4a7b1930cb0204a14fbf
font_02_sfnt_off0000f302.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF302 10948 bytes
SHA-256: ec56eb260b0b86ad410339e2ccb920be62d25ba72a8d31bcfa26268745358325