Malicious PDF — malware analysis report

Static analysis result for SHA-256 5324724aa35ae800…

MALICIOUS

PDF

82.1 KB Created: 2021-09-11 23:12:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 52948424e6f3ed2c839cd4bbff03a99e SHA-1: c3553ff8862b6b5fa5724e6775a888e3ed89c5be SHA-256: 5324724aa35ae800e1e2f565dbe2bfb5e2137c23610b1599745fa79d20995946
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code within documents. It also features a link farm pointing to multiple disposable hosting sites, including a compromised WordPress upload, suggesting an attempt to obscure the final destination and evade detection. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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 http://mrs724.ir/basefile/drtiketcom/files/tugetigojikutumebokesife.pdf In PDF document text
    • https://metnar.pl/web/uploads/files/60602750661.pdfIn PDF document text
    • http://doingthing.com/downloads/blog/geust/files/89964713199.pdfIn PDF document text
    • http://ecohort.com/userfiles/files/wifamapope.pdfIn PDF document text
    • http://opusincertum.it/userfiles/files/42362115735.pdfIn PDF document text
    • http://claudiodauelsberg.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161342b4f79a54---25417402597.pdfIn PDF document text
    • https://podimercrm.com/img/files/fisufonako.pdfIn PDF document text
    • https://abrasco.org.br/ckfinder/userfiles/files/lupijamonazatitofam.pdfIn PDF document text
    • https://menuiserie-sainte-anne.fr/userfiles/file/38939429072.pdfIn PDF document text
    • http://fastcredit.ge/userfiles/file/26382243418.pdfIn PDF document text
    • https://fotokeramika.bg/userfiles/file/fuvadutomine.pdfIn PDF document text
    • https://www.santaterezinha.com.br/js/ckfinder/userfiles/files/18732685839.pdfIn PDF document text
    • https://austarpharma.austarchina.com/upload/files/tudilurorurozu.pdfIn PDF document text
    • https://taiwan-tiaya.com/upload/tiaya_official/files/kejakuwisijajeb.pdfIn PDF document text
    • https://xn--bankkrtya-41a.hu/js/ckfinder/userfiles/files/20815488964.pdfIn PDF document text
    • http://topspeed4wd.com/ckfinder/userfiles/files/simik.pdfIn PDF document text
    • https://greenbins.ca/ckfinder/userfiles/files/92098993148.pdfIn PDF document text
    • https://mediabandit.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f3a3a9f6ba---28877936640.pdfIn PDF document text
    • https://www.savininkai.lt/ckfinder/userfiles/files/28272717904.pdfIn PDF document text
    • http://faurerom.com/userfiles/file/58393109979.pdfIn PDF document text
    • https://g-ortho.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161351eb7cdab4---vapunedijol.pdfIn PDF document text
    • http://yongchengtech.com/uploads/files/202109060259415585.pdfIn PDF document text
    • https://iwistw.com/upload/files/52269296221.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=workout+log+for+androidPDF 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_off0000dc2c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC2C 18296 bytes
SHA-256: 461484323b7395d2b93edbab97b9c836a6cc050946285cf51f8a963180c6eaf9
font_01_sfnt_off00010b97.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B97 10412 bytes
SHA-256: 21d2dff144d222469c4a75bbd59e83a29c5e628102e70811b0e1660233f97272
font_02_sfnt_off00012311.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12311 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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