Malicious PDF — malware analysis report

Static analysis result for SHA-256 d5989d8240980b89…

MALICIOUS

PDF

81.8 KB Created: 2021-09-10 03:38:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: d29a17cf9a031472e789d94871d82f66 SHA-1: e6627f6cd187711b78b799a2eec360fa4746679f SHA-256: d5989d8240980b899633250d01d585d74d847fd6635bbfa9e7a3b35e75081c30
164 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and a significant number of external URIs, many of which point to compromised CMS upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded JavaScript likely facilitates the execution of further malicious code or redirects the user to phishing or malware download sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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 https://irlanc.ru/uplcv?utm_term=video+calling+video+download PDF link annotation
    • http://www.farparts.cl/wp-content/plugins/formcraft/file-upload/server/content/files/1612f34c850b9f---89312447712.pdfIn PDF document text
    • http://teaterskolen-efteruddannelsen.dk/ckfinder/userfiles/files/mesewo.pdfIn PDF document text
    • https://avflash.nl/upload/files/bejivofig.pdfIn PDF document text
    • https://www.ediliziaindustriale.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134ba47c7a35---woluxadox.pdfIn PDF document text
    • http://patriabrno.cz/userfiles/files/xofivowu.pdfIn PDF document text
    • https://nitm.ac.in/nitmeghalaya/ckfinder/userfiles/files/78898981154.pdfIn PDF document text
    • http://kaizousha.com/js/upload/files/22052547228.pdfIn PDF document text
    • https://biodez.lt/i/File/43172304619.pdfIn PDF document text
    • http://mamaskitchenorder.com/uploads/files/14270354772.pdfIn PDF document text
    • http://meuble-tunisie.com/userfiles/file/fasokojanexib.pdfIn PDF document text
    • http://aelma.com/sites/default/userfiles/file/pevuzofexoginubawake.pdfIn PDF document text
    • http://zaun-produzent.de/userfiles/file/zopipejedokutexuxadi.pdfIn PDF document text
    • https://oncetrabzon.com/resimler/files/29551128530.pdfIn PDF document text
    • http://quiltingacademy.com/fckeditor/userfiles/file/pegavodorefazuxada.pdfIn PDF document text
    • http://huh.hu/UserFiles/File/43241466141.pdfIn PDF document text
    • http://szjg.hu/images/file/41116476910.pdfIn PDF document text
    • http://sumosushingrill.com/uploads/files/lizorenesunuve.pdfIn PDF document text
    • http://salonlomi.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16134edef36db4---litojazefozomusamesekimu.pdfIn PDF document text
    • https://www.verimevzabavu.cz/ckfinder/userfiles/files/61982168411.pdfIn PDF document text
    • https://na-nule.ru/wp-content/plugins/super-forms/uploads/php/files/gqrfgbgtegmmiu8sfajrq37093/58339264042.pdfIn PDF document text
    • http://www.museopizarra.com/ckfinder/userfiles/files/49749686812.pdfIn PDF document text
    • https://www.intermediastudios.com.mx/wp-content/plugins/super-forms/uploads/php/files/44bc4c22c5dd8aa203e10cfa0fb22580/neripitakit.pdfIn PDF document text
    • https://ratodua.com/contents/files/xewajuripibuvufesimoja.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_off0000dc83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC83 17816 bytes
SHA-256: aa222bf6ff33df1c9b5a00764e101b2e8a4c01b3a53f1b936246f0e76165c3a1
font_01_sfnt_off00010a75.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A75 10300 bytes
SHA-256: a86933d6c7903eec82a233b91742c609e8c3e008e37bb9b6807468d5fa01de3f
font_02_sfnt_off0001218d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1218D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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