Malicious PDF — malware analysis report

Static analysis result for SHA-256 34d70cae28466818…

MALICIOUS

PDF

79.8 KB Created: 2021-09-10 20:45:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 40ae094947242c89f4fa5814210c1092 SHA-1: 0dd514e108ccad551ac4327047f26e451e3126aa SHA-256: 34d70cae28466818e4249cbc302c062d97fe7f708d6bc56bef027a2c4f0f5da1
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF contains embedded JavaScript, a common technique for malicious PDFs to execute code or redirect users. The presence of multiple external URIs, including those hosted on compromised WordPress sites and disposable domains, strongly suggests a phishing or malware distribution campaign. The ML classifier and ClamAV detection further confirm its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://spain-ex.com/images/blog/file/97024354407.pdf In PDF document text
    • http://www.ebsjosepirosamaria.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ff54d11d59---22132494878.pdfIn PDF document text
    • http://prodesign31.ru/wp-content/plugins/formcraft/file-upload/server/content/files/161394cc0b6781---luzipu.pdfIn PDF document text
    • https://markmont.eu/editor_uploads/system/files/67366846935.pdfIn PDF document text
    • http://kursverwaltung.fit-n-essen.ch/ckfinder/userfiles/files/girorozukitetazivegofuwo.pdfIn PDF document text
    • http://www.kzhep.in.ua/wp-content/plugins/super-forms/uploads/php/files/k2a2769s00dfcv846491ht5k51/18794433668.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/4ru2nj36uk8toul3mvj6nkg44i/98998289730.pdfIn PDF document text
    • http://magogaralbamoble.com/galeria/files/97298318528.pdfIn PDF document text
    • https://riosemarescentrodemergulho.com/ckfinder/files/16004922861.pdfIn PDF document text
    • https://pharmawell.eu/ckfinder/userfiles/files/kafezaz.pdfIn PDF document text
    • http://mea-travel.pl/userfiles/file/78847250506.pdfIn PDF document text
    • http://ubytovani-budejovice.cz/picture/vtextu/file/96389584902.pdfIn PDF document text
    • http://yokosohk.com/files/fckfiles/file/gepizevibifove.pdfIn PDF document text
    • http://bebelino.ru/userfiles/file/91569639511.pdfIn PDF document text
    • http://jiin-torng.com/uploadfiles/20210906194802.pdfIn PDF document text
    • http://760_709737661.mildmedia-dev.eu/uploads/userfiles/files/23878273624.pdfIn PDF document text
    • http://swhwsolution.it/ckeditor-ckfinder-integration/uploads/files/781775759.pdfIn PDF document text
    • http://csc0731.com/userfiles/file/20210907220001_wyecox.pdfIn PDF document text
    • http://www.laterveer-biesenbeek.nl/ckfinder/userfiles/files/nivuvejixasamebogevotoda.pdfIn PDF document text
    • http://leprofit.ee/cmsfile/contentfiles/lowezomadiset.pdfIn PDF document text
    • http://etepi.pt/js/ckfinder/userfiles/files/67972758950.pdfIn PDF document text
    • https://sweetestspaparty.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136e192810ee---42241387438.pdfIn PDF document text
    • https://zlatartopalovic.rs/files/kebisupefazonopo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=cpu+cooler+apk+proPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syIn 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_off0000db4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB4C 18024 bytes
SHA-256: b31cfe66627a8100580f27e3634bd3eb33dc556a18e11b34a2c3099947137528
font_01_sfnt_off000109bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109BF 10128 bytes
SHA-256: c26375d3766440a3ae1763d5fc7a808da9c4613614f781393d7db8425e0191f9
font_02_sfnt_off00012087.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12087 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1