Malicious PDF — malware analysis report

Static analysis result for SHA-256 67ec16073b6f0da5…

MALICIOUS

PDF

82.5 KB Created: 2021-10-14 11:01:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: bc905d67a5448d6b9f6f4d28b3882a72 SHA-1: 4ad9b7da79c65143a38d08125ffea7b76e2a2876 SHA-256: 67ec16073b6f0da50d22360ddea0b66a9be95dd9d86ea8b25eeb9c1578d384fe
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple links pointing to compromised websites hosting other PDF files. These links are presented in a way that suggests they are search results or download links, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly support the malicious nature of this file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://thepetrichortouch.com/wp-content/plugins/super-forms/uploads/php/files/e0pocna51ubgm5vblb27ouumfh/15604582172.pdf In PDF document text
    • http://anipetkingdom.com/webroot/img/files/77410654735.pdfIn PDF document text
    • https://projetovm.com/uploads/files/97000706652.pdfIn PDF document text
    • http://ipceurope.com/assets/file/kumonavefejinoralulur.pdfIn PDF document text
    • https://greshamgilessalon.com/wp-content/plugins/super-forms/uploads/php/files/dd0a6a622b7e030e2ba61940661a67ab/wezel.pdfIn PDF document text
    • http://xlpe.net/Images_upload/files/bidufipitafoko.pdfIn PDF document text
    • http://feg.vn/uploads/files/63243183319.pdfIn PDF document text
    • https://www.isgs.org/wp-content/plugins/super-forms/uploads/php/files/9a165740d55ec3115ea83dce5f039b88/kotivedelofovanuguf.pdfIn PDF document text
    • http://itcck.org/upload/editor/file/35270560745.pdfIn PDF document text
    • http://cps-mbstu.edu.bd/app/webroot/js/ckfinder/userfiles/files/fasokikipa.pdfIn PDF document text
    • http://dlabiura.kbo.pl/ckfinder/userfiles/files/gabovege.pdfIn PDF document text
    • https://sintasyapi.com/img/userfiles/file/volatokawenexiroxo.pdfIn PDF document text
    • http://skybuildinfraprojects.com/uploads/zunazixi.pdfIn PDF document text
    • http://dissanna.com/temp/fckeditor/file/kajojifevakaj.pdfIn PDF document text
    • http://mastervin.ru/files/file/42703268049.pdfIn PDF document text
    • http://bippex.com/filespath/files/20210925183137.pdfIn PDF document text
    • http://caratow.eu/userfiles/file/zawonaduzejefigoni.pdfIn PDF document text
    • http://indemo.pl/Image/files/gaderokebowejapo.pdfIn PDF document text
    • http://studioagronomoserragiotto.eu/userfiles/files/58250766905.pdfIn PDF document text
    • https://petroservice-eg.com/userfiles/file/fegepusilewujititum.pdfIn PDF document text
    • http://thietbidienmpe.net/upload/files/23210989522.pdfIn PDF document text
    • https://next-engineering.com/userfiles/files/juvewomafimaminatoteg.pdfIn PDF document text
    • https://thinkglobalcompliance.com/ckfinder/userfiles/files/97233084403.pdfIn PDF document text
    • https://gmt-tw.com/app/webroot/userfiles/files/73361064952.pdfIn PDF document text
    • https://tiguan-wiki.ru/file/43407754731.pdfIn PDF document text
    • https://volgogradexpo.ru/ckfinder/userfiles/files/zufowifovokero.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Gsjc/~3/HKUGBsJGI0E/uplcv?utm_term=halsey+without+me+song+mp3+downloadPDF 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_off0000dae9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAE9 11204 bytes
SHA-256: a7fdd6b53f76ee9bac6356acd4c4e1a6510965831714dd36a3d41fc296e38392
font_01_sfnt_off0000f4cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4CF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010ce1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CE1 17556 bytes
SHA-256: 739d08a4701224f3410017e6c07db31f313bbe37ba9f51106abaa8aff1de210f

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