Malicious PDF — malware analysis report

Static analysis result for SHA-256 0644de7c64d902a9…

MALICIOUS

PDF

63.8 KB Created: 2021-09-05 05:54:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 0520c0b08974e7ee518f7ed4c615dc58 SHA-1: 9889f586fcd6a84488c636c51315b9bd93666cb5 SHA-256: 0644de7c64d902a97d155aab80df7290b0e6b29148330731b346ec597d65d05f
154 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple potentially compromised websites hosted on disposable or compromised domains. The presence of numerous links and the nature of the hosting suggest an attempt to distribute malware or conduct phishing attacks.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7789

Heuristics 5

  • 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
  • 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://www.startservis.sk/novy/ckfinder/userfiles/files/bufufufopamupipesotaxeret.pdf In PDF document text
    • http://baigeleather.com/userfiles/file/49874763295.pdfIn PDF document text
    • http://www.medical-psychology.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1608353325f8b5---jasezajuvitufufod.pdfIn PDF document text
    • http://garantc.ru/userfiles/file/puwupim.pdfIn PDF document text
    • http://finsura-lifedirect.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160c061a851814---37073133176.pdfIn PDF document text
    • https://mailing.crpm.ch/ck/ckfinder/userfiles/files/81267823268.pdfIn PDF document text
    • http://kaowei.tw/image/files/20210617_195007.pdfIn PDF document text
    • http://111-orte.de/testarea/cwsCMSlight/media/files/30616908675.pdfIn PDF document text
    • https://wcdt.co.th/wp-content/plugins/super-forms/uploads/php/files/331ea8emq2285jpdq5cmpu6r3e/buzukaduzezajagaxesikide.pdfIn PDF document text
    • http://adanateknikservis.web.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16073be764bb04---32598707404.pdfIn PDF document text
    • http://summitremodelinginc.com/userfiles/files/gusowadepagopet.pdfIn PDF document text
    • http://wronba.com/uploads/wysiwyg/file/koxuraxujofikejedanelisi.pdfIn PDF document text
    • http://prodesign31.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160c6e325e61ec---53186951223.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609863cf99da0---4439537569.pdfIn PDF document text
    • https://acgroupenterprise.com/userfiles/file/titoxowijezatuj.pdfIn PDF document text
    • http://mygiftltd.com/userfiles/file/86475167072.pdfIn PDF document text
    • https://hoovermaids.com/wp-content/plugins/super-forms/uploads/php/files/ebc54ccca877de0763108fc4a8dd9dec/19097095227.pdfIn PDF document text
    • https://gachbinhduong.com/upload/file/5495605451.pdfIn PDF document text
    • https://moniimpex.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f1ab8bc8dd0---97990465189.pdfIn PDF document text
    • http://verduciautodemolizioni.it/userfiles/file/42035763017.pdfIn PDF document text
    • https://ancoraeducacion.com/images/ropenerawufosa.pdfIn PDF document text
    • http://arci-mp.fr/admin/File/xokefonaradoxirofiv.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=spilled+milk+based+on+a+true+story+pdfPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e967.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE967 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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