Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef8161644573d023…

MALICIOUS

PDF

69.9 KB Created: 2021-09-28 05:26:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: f8e8739c213e88b9971f13014ec092ce SHA-1: 07189986fa2ca7b7933b4088697bbf69c5da0180 SHA-256: ef8161644573d023c08f0264f9ee3aea460490a464d8c7c97b1da744cb563d43
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. The embedded JavaScript is a common technique for initiating malicious actions within PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://printjet.pl/pliki_user/File/99044267263.pdf In PDF document text
    • http://kirakuramenandsushi.com/uploads/files/fapudonizej.pdfIn PDF document text
    • http://zygzak.eu/foto_dane/wysiwyg/File/fibojapinerexafivog.pdfIn PDF document text
    • http://jacsonsfurniture.com/userfiles/file/dobenowevobowasimopurewup.pdfIn PDF document text
    • http://strap.sk/uploads/files/44510190889.pdfIn PDF document text
    • https://kvartira-zalog.ru/wp-content/plugins/super-forms/uploads/php/files/4be78d968667ade7e5348cf0c46a5ee0/kukefodipobevij.pdfIn PDF document text
    • https://brazilairporttransfers.com/ckfinder/userfiles/files/11927818685.pdfIn PDF document text
    • https://finestblogger.de/wp-content/plugins/super-forms/uploads/php/files/tktkvd3v8h58mo4blopu1nqhh7/motitalixuwovazole.pdfIn PDF document text
    • http://akekaluck.com/ckfinder/userfiles/files/99152394820.pdfIn PDF document text
    • http://48bulls.com/js/upload/files/jibezufinileponadukeg.pdfIn PDF document text
    • https://listocrm.com/userfiles/files/79582227273.pdfIn PDF document text
    • https://wintechindia.in/ckfinder/userfiles/files/44204710812.pdfIn PDF document text
    • http://ahdjcm.com/upload/files/bojowoforusimakome.pdfIn PDF document text
    • http://di-tech.kr/fckeditor/userfiles/file/rimawosejiwa.pdfIn PDF document text
    • http://localhomesales.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1614779245458c---70934747772.pdfIn PDF document text
    • https://halead.com/uploadfile/1632786457.pdfIn PDF document text
    • https://zippy-inc.com/app/webroot/userfiles/files/6315456095.pdfIn PDF document text
    • http://euro-ex.com/images/blog/file/judek.pdfIn PDF document text
    • http://ovstav.cz/app/webroot/files/files/46503793357.pdfIn PDF document text
    • http://www.siphonicflowmandiri.com/upload/files/17581624523.pdfIn PDF document text
    • https://privatecambodiatour.com/userfiles/file/belesimajavur.pdfIn PDF document text
    • https://vanphongphamhienluong.com/upload/files/45937460367.pdfIn PDF document text
    • https://silverstonedevelopments.com/ckfinder/userfiles/files/sikegolilimarukukoseg.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=apps+that+give+you+free+robuxPDF 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_off0000af7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF7B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c78d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC78D 16064 bytes
SHA-256: efff9bab14d736d7b8a379e34872567b6da56c2459689c492c3fd1c7c45f1f24
font_02_sfnt_off0000f0bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0BD 10988 bytes
SHA-256: 678e5da4d737f55ea0bcca1e64fb1f84182d930da26138a8133fe94658d5d2ac

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