Malicious PDF — malware analysis report

Static analysis result for SHA-256 475e88e553d973ad…

MALICIOUS

PDF

85.7 KB Created: 2021-08-19 09:30:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: eeb8a7df17e072c72c83d23764882a4c SHA-1: 9668daba314bcaf30789b97d118374542db60c65 SHA-256: 475e88e553d973ad3802bc279fabd864c43afd195212f066567269fa82a27a3e
156 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, directing users to multiple compromised websites hosted on disposable domains, which is a common tactic for phishing or distributing further malware. The PDF structure and embedded URLs suggest it's intended to exploit vulnerabilities or trick users into downloading malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9919

Heuristics 6

  • 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.
  • 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://daonshop.com/files/fckeditor/file/xevifudulat.pdf In PDF document text
    • https://trouver-une-ssii.com/img/pics/files/10438811100.pdfIn PDF document text
    • http://grupogmec.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fe236f163b---15505776903.pdfIn PDF document text
    • http://geredekombiservisi.com/userfiles/file/5849392580.pdfIn PDF document text
    • https://spbmworld.com/anaeter_capital/siteadmin/userfiles/files/pejidivadudunifutufozol.pdfIn PDF document text
    • https://eniedu.com/data/file/20210810003142.pdfIn PDF document text
    • https://kis-u.com/page_data/file/20210627061245.pdfIn PDF document text
    • https://www.golaw.net/wp-content/plugins/formcraft/file-upload/server/content/files/160963d95e4730---78209553787.pdfIn PDF document text
    • https://sakitonus.ru/wp-content/plugins/super-forms/uploads/php/files/acb87e94e83cbe36c788cc4301d0338f/59614355656.pdfIn PDF document text
    • https://www.hemoroidklinigi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160707b352db19---fowogawizodetevaras.pdfIn PDF document text
    • http://portakalweb.net/home/portakal/public_html/ckfinder/userfiles/files/52715532207.pdfIn PDF document text
    • http://lyzebrno.cz/userfiles/file/46500824592.pdfIn PDF document text
    • https://elpmarketing.ca/wp-content/plugins/super-forms/uploads/php/files/698e99653c71f5c85dde06456fa43087/wazevesuwuduxuruge.pdfIn PDF document text
    • http://usmleworkout.com/files/file/jaxibumi.pdfIn PDF document text
    • http://tajeer.co/userfiles/file/vosuzefexinizabumuzeropa.pdfIn PDF document text
    • http://www.radioemka.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e3c68758fc---xinumi.pdfIn PDF document text
    • http://a-swiss.com/upload/userfiles/file/5880455424.pdfIn PDF document text
    • https://controlcert.se/wp-content/plugins/formcraft/file-upload/server/content/files/160f30bd31bc87---fufanefurunelovanewunu.pdfIn PDF document text
    • http://extreamtuning.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1606fb86a5f2cc---fegasugifutirifatog.pdfIn PDF document text
    • http://yanartextil.com/firma/files/12843711489.pdfIn PDF document text
    • https://www.chortho.co.uk/wp-content/plugins/super-forms/uploads/php/files/qhif5avomfuct75j26hj6ni3gb/60843466121.pdfIn PDF document text
    • http://dermatologomiguelgallego.com/miguel/fck/file/buwitulewemesal.pdfIn PDF document text
    • https://www.gs-gleichmann.de/wp-content/plugins/formcraft/file-upload/server/content/files/160fc8fe806987---wonepetiwivebug.pdfIn PDF document text
    • http://principessavencanice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609af3133943a---ginosinativoj.pdfIn PDF document text
    • http://pocatellocampfire.com/wp-content/plugins/super-forms/uploads/php/files/491rps39bat86fcamn7vq1guh2/mogewulazupalufinudod.pdfIn PDF document text
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/vu26cu6hsoki615ka1s2s2aejr/merodixefetuxal.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=human+personality+characteristics+listPDF 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_off0000ebe2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBE2 10844 bytes
SHA-256: f8291b5d3a14b39f8d43bf889d3e34c4dab6746311d856c1a3ff9b77530bf823
font_01_sfnt_off000104b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104B0 16360 bytes
SHA-256: ea273091923b0ef1fb0b5e6280bcb9d47c1ec34b60c7e8832db7f3bdbbfdb33f
font_02_sfnt_off00012e46.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E46 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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