Malicious PDF — malware analysis report

Static analysis result for SHA-256 dfbe38175f5546b7…

MALICIOUS

PDF

82.2 KB Created: 2021-09-01 07:06:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: ca40faf4826e6b368f7da7529082df77 SHA-1: 42f4e0c6f3877d7c5f66e5b65eebb4609bc85d2b SHA-256: dfbe38175f5546b76f1c8ff2e78a51d2fc2d39da61ca95261cb1eeb939d37f6e
156 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 the document functions as a link farm, directing users to multiple external websites, some hosted on compromised CMS platforms. The presence of numerous embedded URLs, many pointing to potentially malicious or disposable domains, supports the conclusion that this file is designed to redirect users to harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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 http://bitite.lv/media/txt/122/file/82649113059.pdf In PDF document text
    • http://groupkaishan.com/d/files/77275900473.pdfIn PDF document text
    • http://www.northeastmarquees.com/wp-content/plugins/super-forms/uploads/php/files/2edbc3387d27c705738310e14f89ebe3/92131467733.pdfIn PDF document text
    • https://bakotech.at/uploads/ckeditor/files/75270345824.pdfIn PDF document text
    • https://ruxthai.com/ckfinder/userfiles/files/69035052209.pdfIn PDF document text
    • https://slide-bearing.com/d/files/tirotopukejalejosidumaw.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/wafur.pdfIn PDF document text
    • https://mymango.ru/wp-content/plugins/super-forms/uploads/php/files/1eb4b42436e078f46602525fde7a7407/nizerupedavazumemedot.pdfIn PDF document text
    • http://parkety-patemal.sk/files/file/tavunofugovune.pdfIn PDF document text
    • https://jclifeschools.org/wp-content/plugins/super-forms/uploads/php/files/8d9667cb1ddd54bc1f6de9505fdd6f64/91757606678.pdfIn PDF document text
    • http://www.dnevi-sekretarjev.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1608355c0d5974---80254650733.pdfIn PDF document text
    • http://allamericannursing.com/userfiles/file/nozumemof.pdfIn PDF document text
    • https://petroblend.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f138f8e6301---tovorul.pdfIn PDF document text
    • https://www.nestroots.com/wp-content/plugins/super-forms/uploads/php/files/0rsr1f7pbi2fbsm7or99blah75/vanegejagopetaxasexifeda.pdfIn PDF document text
    • https://promocionesnma.com/wp-content/plugins/super-forms/uploads/php/files/7dfddc23302777b52e12c0dc1f270c0d/suroduwa.pdfIn PDF document text
    • http://mpti.ru/userfiles/file/mutajeloz.pdfIn PDF document text
    • https://audit-advisers.com/userfiles/file/95518694321.pdfIn PDF document text
    • http://cn-daomeng.com/upload/userfiles/files/529309406173d97c9c0d391df7f39ad7.pdfIn PDF document text
    • https://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cf0a5c9781---safobojov.pdfIn PDF document text
    • https://shinko-tw.com/UserFiles/file/kipovabak.pdfIn PDF document text
    • https://iskoruma.com/upload/ckfinder/files/42677975299.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=visual+online+dictionaryPDF 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_off0000dd36.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD36 17432 bytes
SHA-256: 01066747abc3c7debbd271d20b256d8d72f18bd3db8136a13926bddfc36cd5bd
font_01_sfnt_off00010a6a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A6A 10548 bytes
SHA-256: aa2a7f0c821a53363d4339d7822e8b91e1ea4999223c1331a9b3faf60bf98fbf
font_02_sfnt_off000122a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122A0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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