Malicious PDF — malware analysis report

Static analysis result for SHA-256 a72b7f9a4f6833f2…

MALICIOUS

PDF

86.7 KB Created: 2021-09-04 04:23:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 5e3ec51f4259766929aa1579d26a8c56 SHA-1: aac5192b496e699bbf97d8419d92cae2fadf6545 SHA-256: a72b7f9a4f6833f260928ea372ca7e9d781df247246b3719ecca81cc1a9bd247
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript, which is a common technique for delivering malicious content. The PDF also features a link farm pointing to various compromised websites, likely intended to host further stages of the attack or phishing content. ClamAV detection and ML classification strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9848

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://crewmak.ru/uplcv?utm_term=grade+5+spelling+activities+pdf PDF link annotation
    • http://autosvanbeek.nl/mindcms/js/ckf/userfiles/files/56652159051.pdfIn PDF document text
    • http://vmkmsz.hu/userfiles/file/39310868372.pdfIn PDF document text
    • https://apexforestservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae0f531da41---jetarobidugodugobogo.pdfIn PDF document text
    • https://landatur.com/files/galeria/files/viwuzakodopinevagov.pdfIn PDF document text
    • http://xn--b1ahhafccpgkb2bxo.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/6aef958584582ff974deb1f3f3dfe32e/44251950864.pdfIn PDF document text
    • https://carthink.org/wp-content/plugins/formcraft/file-upload/server/content/files/1611dd1e222a9d---76602899787.pdfIn PDF document text
    • http://dunajecbiala.pl/upload/File/jadotivunarasokoki.pdfIn PDF document text
    • https://portsidestrategies.com/wp-content/plugins/super-forms/uploads/php/files/fa159a577b5374e6d74a32f95806399b/31635024760.pdfIn PDF document text
    • https://www.golddustdental.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bda80a61146---sosujidezawiruke.pdfIn PDF document text
    • https://www.onestopnaturalstore.ca/wp-content/plugins/super-forms/uploads/php/files/emc7mfq878005rfv47qg2l8pcm/kexuduxi.pdfIn PDF document text
    • https://projetovm.com/uploads/files/16409617808.pdfIn PDF document text
    • https://www.acptechnologies.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cf753cc255---35750286775.pdfIn PDF document text
    • https://borderpak.com/wp-content/plugins/super-forms/uploads/php/files/922725d669fa727a7a7c8393ed16dba7/90733227920.pdfIn PDF document text
    • http://wittlich-luexem.de/userfiles/file/47400257813.pdfIn PDF document text
    • https://appfacile.it/file/1020427663.pdfIn PDF document text
    • https://kvgrup.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/160c2971e65756---64282452853.pdfIn PDF document text
    • https://dedywiredja.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610eb40381c4a---97457943706.pdfIn PDF document text
    • http://sammyuriasproperties.com/userfiles/files/wumagasusur.pdfIn PDF document text
    • https://laxmigrouppune.com/wp-content/plugins/super-forms/uploads/php/files/fb4c26a73cff8447fd758e1cb7ecbb94/13219187496.pdfIn PDF document text
    • http://studiocastigli.eu/userfiles/files/44538459573.pdfIn PDF document text
    • http://bascobrunswick.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16079d6c4995e0---93849524569.pdfIn PDF document text
    • http://azizolace.cz/images/file/19231490086.pdfIn PDF document text
    • http://www.gametimecatering.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085c17ccc72e---tabetazabevi.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/75357217147.pdfIn PDF document text
    • https://ahi.com.ua/wp-content/plugins/super-forms/uploads/php/files/dbf5a509d141bb1c634c539873c3a758/jabogorajonoserobepi.pdfIn PDF document text
    • https://gym-rectif.fr/ckfinder/userfiles/files/65034908991.pdfIn PDF document text
    • 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_off0000ec5b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC5B 18188 bytes
SHA-256: effdb49027b50ce14d7c7246de2d0abbc012404980c595d63f4507d45caccb54
font_01_sfnt_off00011b84.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B84 10916 bytes
SHA-256: 611a09129164b5e43737afc3bab8355bee41617f4fead4e6d21c45f535a13c51
font_02_sfnt_off000134c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x134C7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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