Malicious PDF — malware analysis report

Static analysis result for SHA-256 ac8c40d0c041d584…

MALICIOUS

PDF

75.9 KB Created: 2021-09-06 08:52:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 2269dd22cc4fd56fc6cd3650dc552821 SHA-1: 58d6c435ba6cec096d864402e9145e93142cb4bf SHA-256: ac8c40d0c041d584ae09df42b44b5f8b36da20f991078b23d6c52d4f0afbb89f
164 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and multiple external URIs, many of which point to compromised WordPress sites acting as a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is a common technique for exploiting PDF vulnerabilities or redirecting users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 http://english-island.pl/wp-content/plugins/super-forms/uploads/php/files/t7lod5na0jin19g01r4gncgfj1/livuzusazizazabulesetikam.pdf In PDF document text
    • http://goldenteriyaki.com/uploads/files/75092270051.pdfIn PDF document text
    • http://diagonal.org.ar/wp-content/plugins/formcraft/file-upload/server/content/files/16119d0ba7d487---19344809070.pdfIn PDF document text
    • http://rajasthanmetals.com/userfiles/file/gijedefa.pdfIn PDF document text
    • https://www.coconutlodge.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085dc7607dfa---gezuzisup.pdfIn PDF document text
    • http://faceconnects.com/ci/userfiles/files/lutizej.pdfIn PDF document text
    • http://share-world.tw/userfiles/file/24765245498.pdfIn PDF document text
    • https://samiznojmo.cz/wp-content/plugins/super-forms/uploads/php/files/9df1c28f32e690cf5041478294568990/20569952501.pdfIn PDF document text
    • https://baconbites.com/wp-content/plugins/super-forms/uploads/php/files/20pojpgqelubhc1ljpjtlgr1e1/25867010424.pdfIn PDF document text
    • https://www.advids.co/wp-content/plugins/formcraft/file-upload/server/content/files/160741044a20ae---dusebupup.pdfIn PDF document text
    • https://www.heainc.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f2a84998efd---loguruwobifibut.pdfIn PDF document text
    • http://kraljicabih.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf3eaa47fb1---5517260612.pdfIn PDF document text
    • https://marblobaths.com/app/webroot/img/files/68198194651.pdfIn PDF document text
    • http://www.uvhk.com/wp-content/plugins/formcraft/file-upload/server/content/files/16129a9ad83484---najuxefuruzefuji.pdfIn PDF document text
    • https://couvreur-hautdoubs.fr/internet_new/images_et_fichiers//file/99342195278.pdfIn PDF document text
    • https://condicionamentofisico.com/arquivos/file/juwokifixitevozu.pdfIn PDF document text
    • http://razaviota.ir/basefile/razaviotair/files/41049170402.pdfIn PDF document text
    • https://at1-turbo-j3t.com/contents//files/ruxugedabulevomerinok.pdfIn PDF document text
    • http://www.hcibatiment.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160f19773b7a71---bozazipunoluzokoxukeva.pdfIn PDF document text
    • http://yuha.be/_files/file/84440644138.pdfIn PDF document text
    • https://chachachat.info/js/ckfinder/userfiles/files/85005440344.pdfIn PDF document text
    • http://granitnet.hu/editor_up/46033209399.pdfIn PDF document text
    • http://altadirezione-consulting.it/userfiles/files/77508339966.pdfIn PDF document text
    • http://foreverymuslim.net/home1/forevev3/public_html/foreverymuslim/upload/file/lajilode.pdfIn PDF document text
    • http://stadtbild-intervention.de/Quansis/ckfinder/userfiles/files/tuzurijavokuxusutemepoxa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=100+number+line+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_off0000c70a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC70A 10428 bytes
SHA-256: 3bcca70062b6466a17b324ae80fe933ec2ce9dd9c95291934ee0a86a41ac33b7
font_01_sfnt_off0000de4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE4B 17272 bytes
SHA-256: c6f3d79758736a32101da472fcbdfeedd488c02586ea49dcd20aff154f05ce6b
font_02_sfnt_off00010a1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A1B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1