Malicious PDF — malware analysis report

Static analysis result for SHA-256 a05597b5547a5e82…

MALICIOUS

PDF

80.4 KB Created: 2021-09-23 03:51:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: ba0c3c347675c7a1869096f586678a57 SHA-1: 13b4b40a5ce37becc5a418bdfe26ba774bb70eff SHA-256: a05597b5547a5e8259436737d47b35c3447b5ce40bb7f86ae715b3272ddac6d0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs, many of which point to compromised CMS uploads or are hosted on disposable domains, indicating a link farm designed for phishing or malware distribution. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or trojan delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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://marljivo.hr/userfiles/file/zozomumenexedawuju.pdf In PDF document text
    • https://itscebu.com/upload/file/20210917144233.pdfIn PDF document text
    • https://deesudcoolingtower.com/userfiles/file/diduboj.pdfIn PDF document text
    • http://mobydick-band.de/fckdata/file/10594092914.pdfIn PDF document text
    • http://lexen.ca/userfiles/files/rivigososefemat.pdfIn PDF document text
    • http://sangiorgioautoservizi.com/userfiles/files/43498925070.pdfIn PDF document text
    • http://ottotech.center/userfiles/file/39469219494.pdfIn PDF document text
    • http://teraval.cz/res/file/bepofuzulisi.pdfIn PDF document text
    • http://frezerovka.by/images/fxeditor/file/bisowenurikubabetabixorur.pdfIn PDF document text
    • http://konstruktor33.ru/app/webroot/files/files/87068577996.pdfIn PDF document text
    • http://dobryremont.pl/ebobas/portal/app/webroot/img/tmp/file/1632353306442.pdfIn PDF document text
    • https://cashofferoregon.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613cfb5eb90ed---sumasij.pdfIn PDF document text
    • http://teewer.mn/ckfinder/userfiles/files/15177555639.pdfIn PDF document text
    • https://gea99.com/ckfinder/userfiles/files/83809286319.pdfIn PDF document text
    • https://vzglavniki.net/data/file/90046067148.pdfIn PDF document text
    • https://cv-vezouze.fr/media/file/tijefuzarudegugowigitetib.pdfIn PDF document text
    • https://dzido.pl/userfiles/file/rebotaki.pdfIn PDF document text
    • https://hanyauntuktesting.com/contents/files/40948196982.pdfIn PDF document text
    • http://pelejas.com/IMAGENS/CKFINDER/files/37954565239.pdfIn PDF document text
    • http://bburago.info/admin/fckeditor/userfiles/file/jeremawonimenegapakenes.pdfIn PDF document text
    • http://amoy-art.com/Upload/file/45180101215.pdfIn PDF document text
    • http://www.insurancedirectcanada.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16148ebfd8cdba---39239963130.pdfIn PDF document text
    • https://goldengrowers.com/wp-content/plugins/super-forms/uploads/php/files/ec899ab285aff2c6084ba961501ca937/36472921455.pdfIn PDF document text
    • http://geosond.pl/userfiles/file/gibapurosirekipinimigizen.pdfIn PDF document text
    • http://onfireinteriors.com/userfiles/galuzosuramogovufokajikim.pdfIn PDF document text
    • http://www.johnknox.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1614bcc96a3460---vonaferefesurimoged.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=downloader+youtube+downloader+tubematePDF 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_off0000d799.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD799 17092 bytes
SHA-256: 05aa413bfc0467f680fd639f18c569146575d6161dfbc5cace9a345916ee280f
font_01_sfnt_off00010377.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10377 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011b8e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B8E 10592 bytes
SHA-256: a8ce3b2c0d8b750f33f6722af6328f233c4a99c4cf9d29d27de1c55a5d41ceaf

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