Malicious PDF — malware analysis report

Static analysis result for SHA-256 dcbf786a1f0fbf9a…

MALICIOUS

PDF

84.0 KB Created: 2021-09-07 11:54:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: d79cc5a26079815f04d9673bf41218a8 SHA-1: c7216dade0e2383498a2927232ae369eaa833b22 SHA-256: dcbf786a1f0fbf9a00fb1274a96885b89f78de5d8387cb5495d881a5a77d5d5e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to compromised WordPress sites acting as link farms. These link farms likely serve to obscure the final malicious destination, which could be a phishing page or a malware download site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 6

  • 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.
  • 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://earplighting.com/wp-content/plugins/super-forms/uploads/php/files/c89368f1ce40c8c712fe4357eb9b0b12/wowapijag.pdf In PDF document text
    • http://ottotech.center/userfiles/file/20850221561.pdfIn PDF document text
    • http://extreamtuning.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160981b6103c9d---85942067939.pdfIn PDF document text
    • https://xo-sound.ru/userfiles/file/97633244507.pdfIn PDF document text
    • http://icr34.fr/icr/icr34.fr/www/files/files/kedotanuvidizuze.pdfIn PDF document text
    • http://associacaoguainumbi.org.br/wp/wp-content/plugins/formcraft/file-upload/server/content/files/1606f7dc5b74d6---37246415318.pdfIn PDF document text
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/8a3e933a6d31ccd2080bc10e86080bb9/71816879279.pdfIn PDF document text
    • http://ark-mr.com/data/home/qxu2063190031/htdocs/uploadfile/files/batifixotefuwojixupisuxel.pdfIn PDF document text
    • http://mail-business.ru/uploads/file/78016154097.pdfIn PDF document text
    • https://tomorrowhubs.com/upload/users/files/fexakix.pdfIn PDF document text
    • https://fietenhaardenenkachels.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16108312be5d7b---81850997542.pdfIn PDF document text
    • https://tvsporedi.si/vsebina/wuzabunojera.pdfIn PDF document text
    • https://vakukh.ru/wp-content/plugins/super-forms/uploads/php/files/8037c52e9a8ee648bdd3e8bd9ec0986e/ponumavobatuvokasatove.pdfIn PDF document text
    • http://riminabda.sk/userfiles/file/revijuliwapij.pdfIn PDF document text
    • https://bienenaktuell.com/sites/bienenaktuell.com/files/file/42122887826.pdfIn PDF document text
    • https://www.rowtheerne.com/wp-content/plugins/super-forms/uploads/php/files/7f5504c5083a44c0792709c72af1e868/kilujezojipeka.pdfIn PDF document text
    • http://fpsh1980.com/clients/7/7d/7de5299bd6bdc19cdd6b275c058e9c4a/File/tokerotakurubamigekov.pdfIn PDF document text
    • http://alexlunacoach.com/img/editor/file/49318642755.pdfIn PDF document text
    • https://vestol.bg/files/file/95744325754.pdfIn PDF document text
    • https://unibel.pl/pliki/upload/file/7295087294.pdfIn PDF document text
    • https://www.euroservicemilano.it/wp-content/plugins/formcraft/file-upload/server/content/files/1608289e9a27f1---lofonumokajirizuzuduxukus.pdfIn PDF document text
    • http://slmj8.com/data/userfiles/files/tarowiwenonijekofuseva.pdfIn PDF document text
    • https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c4bf0b3903e---tetovulurugif.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=latukartta+espoo+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_off0000e322.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE322 10400 bytes
SHA-256: 77a5b8ab706f1d8b5108d79df60f5a64c20ddee93c2d359a0616a79d30663d8a
font_01_sfnt_off0000fadf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFADF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000112f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112F1 18368 bytes
SHA-256: 8a67758228e6040103f27573369bbabb193039de2355bed47f87cbb3eaabadb3

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