Malicious PDF — malware analysis report

Static analysis result for SHA-256 9fb471418e65ea94…

MALICIOUS

PDF

82.5 KB Created: 2021-09-13 19:23:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 611ac2171dbc0b4f3dfc49eea49fd343 SHA-1: 791a1daaba9c7c09ebca30c3ecb2d355de8d8115 SHA-256: 9fb471418e65ea94d92f8eca04ed376bb06de8ce701619d4c13863977d4f75d4
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was flagged by multiple heuristics as malicious, including a high-severity PDF_RANDOM_URL_LINK and ML_NYX_PDF_MALICIOUS. It contains a large number of embedded links pointing to various domains, many of which appear to be compromised WordPress sites. The presence of these links suggests an attempt to redirect users to malicious content, likely for phishing or malware distribution. No scripts were extracted, but the overall structure indicates a link farm designed to host or redirect to malicious files.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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 http://queuemanagementsystems.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137704b604db---29216649800.pdf In PDF document text
    • https://holycrosshealthcare.com/userfiles/files/jarefilolerat.pdfIn PDF document text
    • https://xn--espaoldetalca-lkb.cl/var/www/html/upload/file/nodebofabupesetakogipife.pdfIn PDF document text
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a90d5d1bec---66472817216.pdfIn PDF document text
    • http://www.jcca.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/16132bb60b17b3---tatilogofibukuzex.pdfIn PDF document text
    • https://anitt.in/ckfinder/userfiles/files/badeba.pdfIn PDF document text
    • http://caminodesantiagoenmoto.com/assets/ckfinder/core/connector/php/uploads/files/45941391863.pdfIn PDF document text
    • http://myucpb.com/userfiles/file/86351952754.pdfIn PDF document text
    • http://hoteldazegliotorino.com/userfiles/files/juwekururutupedugofipoze.pdfIn PDF document text
    • https://endobible.com/userfiles/file/33562226770.pdfIn PDF document text
    • https://ip-pharma.net/data/files/92416504535.pdfIn PDF document text
    • http://pharmabiosolutions.com/filespath/files/20210910111530.pdfIn PDF document text
    • http://probeg2000.ru/files/userfiles/files/rubikesedozujuredimemed.pdfIn PDF document text
    • http://kulturazebrak.cz/userfiles/74602911417.pdfIn PDF document text
    • https://eguiders.com/uploads/61307818743.pdfIn PDF document text
    • http://erago.cidees.com/uploads/files/linipafakebaziwi.pdfIn PDF document text
    • https://miraclechuppahs.com/userfiles/file/51457511549.pdfIn PDF document text
    • http://carraracucinecomponibilitrapani.it/userfiles/files/53925860510.pdfIn PDF document text
    • https://247christianity.org/fckeditor/userfiles/file/xufisosipigab1631193351.pdfIn PDF document text
    • https://purefeeling8.com/data/file/53016548400.pdfIn PDF document text
    • https://bbensonmft.com/wp-content/plugins/super-forms/uploads/php/files/7b9d0a188e5cc3167dc87a5f1300b45f/81271203307.pdfIn PDF document text
    • http://matras-devison.ru/upload/file/tukokugixapabetagopi.pdfIn PDF document text
    • http://taxilitomerice.cz/ckfinder/userfiles/files/tagilerafef.pdfIn PDF document text
    • http://paitoonbox.com/userfiles/files/fenewuseje.pdfIn PDF document text
    • https://mallarpurnaisuva.org/go/file/wosamagafejubuzurokowezo.pdfIn PDF document text
    • https://upbfassadenbau.com/upload/file/linifawumoxezifenopitako.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=wcc+3+mod+apk+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_off0000e02a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE02A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f83c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF83C 17132 bytes
SHA-256: a1bc7498270d2666d257bb5f09fd6e1629431582f7da82daacda93b87f435582
font_02_sfnt_off000124b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124B1 10428 bytes
SHA-256: 6e3ec749d3c8bd3ac46ade6b8b435cb5d79f099d6f7a76f56c4e70fa6271d3ec

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