Malicious PDF — malware analysis report

Static analysis result for SHA-256 d1bfceb82937a21f…

MALICIOUS

PDF

87.2 KB Created: 2021-07-23 00:01:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 8cc72cdd2f14be1af68fe0e33d2c017f SHA-1: 9c990ce36f94817cd3cd7bdd7715e33466ee18aa SHA-256: d1bfceb82937a21f00ced15eef4a46c2f6f568eb4abb03b78f059196561176c5
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code within PDF documents. The sample also exhibits characteristics of a link farm, with numerous URLs pointing to potentially compromised WordPress sites, suggesting an attempt to redirect users to malicious content. The ClamAV detection and ML classifier further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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 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 https://deewo.de/wp-content/plugins/formcraft/file-upload/server/content/files/160912fab0188b---14280944364.pdf
    • http://fogathajtohirek.hu/fckfiles/file/nupetusuratapixadugub.pdf
    • http://architects-desk.com/uploadsfile/danoxono.pdf
    • http://toastwarenhuis.nl/app/webroot/files/userfiles/files/losomujalir.pdf
    • http://www.vitrierbxl.be/wp-content/plugins/formcraft/file-upload/server/content/files/1608f4cd558026---69852492505.pdf
    • http://exactblue.com/wp-content/plugins/formcraft/file-upload/server/content/files/160840583caee2---xuwajuxa.pdf
    • http://asianaccounting.com/admin/fckeditor/userfiles/file/80858022960.pdf
    • http://www.jamesbgriffinlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ea131a310d---rotaduje.pdf
    • http://traiteur-ribot.fr/userfiles/file/wesujirifawa.pdf
    • https://sirikulsteel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cad1c234350---sofapegijozetixosemidotax.pdf
    • https://tortugafilms.ca/adminfiles/file/dugexer.pdf
    • http://ordineveterinarivenezia.eu/userfiles/files/43237223456.pdf
    • https://lashmakerpro.it/wp-content/plugins/super-forms/uploads/php/files/6k837gsoc24uqncsfk88rsao11/27028062394.pdf
    • https://qualitylightsolutions.com/wp-content/plugins/super-forms/uploads/php/files/aa06e7ca125d44ab5d83b71b600c6a7f/bujugi.pdf
    • https://anthonygillant.com/userfiles/file/fotikuji.pdf
    • http://elonsummerstorage.com/wp-content/plugins/formcraft/file-upload/server/content/files/160947c2eee380---93269331183.pdf
    • http://cristal-in.fr/userfiles/file/natip.pdf
    • http://www.alrafeef.com/faisaliya/js/ckfinder/userfiles/files/60433322709.pdf
    • http://espressoperfetto.nl/app/webroot/files/userfiles/files/tizopozulisozawovuze.pdf
    • https://evocative.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160bd0722109e8---puxumu.pdf
    • http://fitviewer.de/files/file/29931713827.pdf
    • http://studiotecnicoarduini.eu/userfiles/files/zajuzedu.pdf
    • http://www.itbaloch.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608232e11c862---46117774753.pdf
    • http://lumieretvie.com/userfiles/file/36379278966.pdf
    • https://neoville.ru/wp-content/plugins/super-forms/uploads/php/files/786e71f8f66a5517d291e707199aad90/xexaxinumuvoke.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=top+stock+scanners
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f1f7.bin
0affbeb2f88e271c467816cc519bca685f8066288be795f84b2987fca62bd6f7
pdf-font-stream PDF embedded font (sfnt) at offset 0xF1F7 17012 bytes
font_01_sfnt_off00011e84.bin
487af5f61a85c952ab97aca0ee384ecbfb27c4db04e902e7f37a947f15103ab2
pdf-font-stream PDF embedded font (sfnt) at offset 0x11E84 10284 bytes
font_02_sfnt_off000135e3.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x135E3 16792 bytes