Malicious PDF — malware analysis report

Static analysis result for SHA-256 e658a1aef2e16e8d…

MALICIOUS

PDF

71.1 KB Created: 2021-09-09 18:15:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 3f38db7d24acccb401e3b3e420269bee SHA-1: 4411dd81914039ccba9c62e72d987de76a98664d SHA-256: e658a1aef2e16e8d8d235102afbdf56aaad797bd21b0b3fe55a888625acf0a92
156 Risk Score

Malware Insights

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

The PDF file contains numerous external URIs and link farms pointing to potentially compromised websites, as indicated by heuristics like PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the structure and URLs indicate a lure to external malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://nomylo.ru/uplcv?utm_term=karaoke+maker+apk PDF link annotation
    • http://kingsbrite.com/kingsbrite.com/userfiles/file/rimuxozezaza.pdfIn PDF document text
    • http://lamekatus.ee/uploads/ckeditor/files/65341738773.pdfIn PDF document text
    • http://patroha.hu/file/kutezibokinigukefumu.pdfIn PDF document text
    • http://augustaelectricalwork.com/editorData/file/wifipekimag.pdfIn PDF document text
    • https://gionggiacam.com/ckfinder/userfiles/files/25696851138.pdfIn PDF document text
    • http://daegyung.kr/userfiles/file/20210903000559.pdfIn PDF document text
    • https://www.hotel-restaurant-plainfaing.fr/ckfinder/userfiles/files/bepozak.pdfIn PDF document text
    • http://nfc-lampang.com/user_img/files/nejirupo.pdfIn PDF document text
    • https://autotoner123.com/home/autotone/public_html/ckeditortest_WORKING/ckfinder/userfiles/files/besajuta.pdfIn PDF document text
    • https://independentmusicleague.com/wp-content/plugins/super-forms/uploads/php/files/a0f765ba67b2fee3a2db8bda8f0e529c/pogozaporaniv.pdfIn PDF document text
    • http://toyotarent.kr/FileData/ckfinder/files/20210902_127F65541BAFF76C.pdfIn PDF document text
    • http://eot.mn/uploads/userfiles/files/zerev.pdfIn PDF document text
    • https://lean-ds.com/upload/editor/file/bavixarebod.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/24a70e3151a20cd3b66270f0a55b718b/givunabevagim.pdfIn PDF document text
    • http://bedrucken24.de/userfiles/file/74810621794.pdfIn PDF document text
    • http://www.deadclan.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16139423b50ecb---fofokixo.pdfIn PDF document text
    • https://www.bluegreenshouseboats.in/wp-content/plugins/formcraft/file-upload/server/content/files/16134f6d2a83cb---vulotap.pdfIn PDF document text
    • http://studiotecnicoligioni.com/userfiles/files/2159000026.pdfIn PDF document text
    • http://www.deco-interieure.com/userfiles/file/81133536142.pdfIn PDF document text
    • http://robertfeinberglaw.com/images/edit_images/file/fopizivomurofukalesev.pdfIn PDF document text
    • https://sushixusa.com/userfiles/files/91501775869.pdfIn PDF document text
    • https://membermimpi.com/contents/files/lulubo.pdfIn PDF document text
    • https://fsbulletsandbrass.com/userfiles/files/ferivosovosazaxo.pdfIn PDF document text
    • http://thanhnienxp.com/vietkiendo/upload/file/46593456091.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_off0000b617.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB617 9988 bytes
SHA-256: bfab5554b8467ac348da1011aaec332c742dca2cf5a6a79c0ec26ed716ed9a42
font_01_sfnt_off0000cc3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC3C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e44e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE44E 16708 bytes
SHA-256: 9973f478ca5fe95f8f37b55e6d96bcd9875936d87c791fe314d58b4bf58979e1

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