Malicious PDF — malware analysis report

Static analysis result for SHA-256 a44ad56910ca7f5e…

MALICIOUS

PDF

88.1 KB Created: 2021-09-24 00:22:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 22958508a32162e5c6db691fe7f9a935 SHA-1: 44018a70164ee7064e22fc59d0d1799283bd4a83 SHA-256: a44ad56910ca7f5ebbe63c3bddc76eb8f13afc80cd3520664d82caf3e59386b4
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains embedded JavaScript, which is often used to redirect users to malicious websites or download further payloads. The heuristics indicate that the PDF acts as a link farm, with many URLs pointing to disposable or compromised hosting, suggesting an attempt to distribute malware or conduct phishing. The ML classifier and ClamAV detection strongly support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9954

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 http://gamebonda.com/ckupload/files/zelikodafajulagutixixave.pdf In PDF document text
    • https://tssch.in/tssch/application/admin/uploads/file/62181874581.pdfIn PDF document text
    • http://cbafjvn.com/uploads/userfiles/file/befijiwumigure.pdfIn PDF document text
    • http://robalton.es/Albums/images/file///41030810359.pdfIn PDF document text
    • https://csn-alliance.com/data/files/virodivivud.pdfIn PDF document text
    • https://chungcungoaigiao.vnpec.xyz/uploads/files/54295300983.pdfIn PDF document text
    • http://xn--80aaaghhaztbcd1agjgbccsgfftf.xn--p1ai/pict/file/metobuzedosifinowatin.pdfIn PDF document text
    • http://ledlight-lamp.com/mingyi/images/userfiles/file/ranalefabinedakevulubaw.pdfIn PDF document text
    • https://gbagencement.fr/uploads/file/98242717976.pdfIn PDF document text
    • https://yuktiedu.com/wp-content/plugins/super-forms/uploads/php/files/7e9048b030ef499cc489cbf0acb9780c/tolemipezo.pdfIn PDF document text
    • https://luxurytravel-show.com/wp-content/plugins/super-forms/uploads/php/files/39fa88ebf3730e49d5f235fad9cdd5e4/gasikazanizanuzitejik.pdfIn PDF document text
    • http://ingore.cn/upload/files/fixunukefopurirenezox.pdfIn PDF document text
    • https://mimpiindah1.com/contents/files/vagunopozavuze.pdfIn PDF document text
    • http://www.leads-bd.org/app/webroot/js/ckfinder/userfiles/files/49509921291.pdfIn PDF document text
    • https://www.mclarenpress.com/wp-content/plugins/formcraft/file-upload/server/content/files/161332fa7b61dd---kakiginazigipotagikeg.pdfIn PDF document text
    • http://wish-pharma.com/upload/files/subugerewozifimi.pdfIn PDF document text
    • http://studiorinaldibedin.eu/userfiles/files/85548241274.pdfIn PDF document text
    • https://epagneuls-bretons.fr/caningest/images/file/wajopotodinefujoje.pdfIn PDF document text
    • https://lacausedeslivres.com/userfiles/file/46433309307.pdfIn PDF document text
    • http://dom-nenilovo.ru/wp-content/plugins/super-forms/uploads/php/files/1b37187621833b27cc0f21723d9fe423/74659138149.pdfIn PDF document text
    • https://vinasimex.com/uploads/file/61032957253.pdfIn PDF document text
    • http://www.sctiec.com/up_files/FCK/file/ropef.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=nascar+apk+modPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d7ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7ED 10272 bytes
SHA-256: 685197ae9a28755a2434ff7551102bbf0437804320036b94a03bfef9c81904cf
font_01_sfnt_off0000ef09.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF09 16164 bytes
SHA-256: a0f26d9ec2bc0bbc84dfb8c1a224a49f7f70479ac92e21d726acd811d43f3bd1
font_02_sfnt_off000104aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104AA 21004 bytes
SHA-256: 0b487ba24c19a8abb6e60b2948e11e2062c72603dbcd57aa0fa4e7fcdb746fec
font_03_sfnt_off00013a4e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A4E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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