Malicious PDF — malware analysis report

Static analysis result for SHA-256 9338cafc0e61b779…

MALICIOUS

PDF

79.3 KB Created: 2021-09-05 13:19:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: ef2090efa1c38462d2c2f2b4fcc7da6b SHA-1: 6e400db70bd2bd83a628deff052383a37f985bbd SHA-256: 9338cafc0e61b779480db0b4b7e52a585abb8b8dc51da8043787e487e9642265
144 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and numerous links pointing to compromised WordPress sites and disposable domains, suggesting it's designed to distribute further malicious content. The ML classifier strongly indicates maliciousness, and the presence of external links to potentially compromised resources supports a phishing or malware distribution attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 7

  • 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.
  • 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://na3.it/misc/file/remavidunekigexuzunozi.pdf In PDF document text
    • http://a2itsolutions.com/chop/multimedia/userfiles/file/95035027632.pdfIn PDF document text
    • http://poexali.org/static/image/_u/system/files/gemajexudubedapopajebavo.pdfIn PDF document text
    • http://cameronhaddock.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6a825612ff---nuvuxavofexe.pdfIn PDF document text
    • http://baraanduliaptti.org/userfiles/file/87834517994.pdfIn PDF document text
    • https://reaga.net/js/ckfinder/userfiles/files/pexeduvulixamibezuxutes.pdfIn PDF document text
    • https://alzubidi.com/userfiles/files/3924678714.pdfIn PDF document text
    • https://floridaholidayplanner.com/wp-content/plugins/super-forms/uploads/php/files/048f0716df94fe914667f2e3d9856199/wowuxawuj.pdfIn PDF document text
    • https://fsbulletsandbrass.com/userfiles/files/490069424.pdfIn PDF document text
    • http://doublehappyvstheinfinitesadness.com/wp-content/plugins/formcraft/file-upload/server/content/files/160acd4c53dee0---63836070118.pdfIn PDF document text
    • https://criteriacambio.com.br/wp-content/plugins/super-forms/uploads/php/files/asp04hrrifg7smop22efrncksf/kagiropusisowodelorobeves.pdfIn PDF document text
    • https://www.aledrukujemy.pl/ckfinder/userfiles/files/58302786702.pdfIn PDF document text
    • https://webgirls-studio.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf975e5753b---20204097156.pdfIn PDF document text
    • https://amagi.la/wp-content/plugins/formcraft/file-upload/server/content/files/1609ecc47621b7---95677346343.pdfIn PDF document text
    • http://forresterfamilyreunion.com/clients/c/cc/cc72bfd2512333311cc1ef5a4fdef90f/File/64266154445.pdfIn PDF document text
    • https://ipcare.nl/wp-content/plugins/super-forms/uploads/php/files/e74inc9qg18f37cusjqj4a9lqv/gumikaletobapobogu.pdfIn PDF document text
    • http://pressvaluation.net/userfiles/file/37848414.pdfIn PDF document text
    • https://rffsev.ru/wp-content/plugins/super-forms/uploads/php/files/5d21d7574a61b2e7abbd669806e072c0/xufere.pdfIn PDF document text
    • https://stewsites.com/wp-content/plugins/super-forms/uploads/php/files/1d00da43b428e2a9ed0769363f4fc7e6/revajuzat.pdfIn PDF document text
    • https://www.lire-les-notes.com/ckfinder/userfiles/files/97195985701.pdfIn PDF document text
    • http://shtaket46.ru/page_edit/_samples/userfiles/files/nivulaluvabubefubezu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=traffic+engineering+design+principles+and+practice+pdfPDF 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_off0000d1dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1DC 17604 bytes
SHA-256: 9b013e0d6f6d73f79b11bce64009a562cc3d419c61867fcb62c193f5f8009052
font_01_sfnt_off0000ff35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF35 10640 bytes
SHA-256: 8b46eaaf8ebf43a41966edfc1922993f72d4a5a15864018e672f0637f59b5e10
font_02_sfnt_off00011776.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11776 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.