Malicious PDF — malware analysis report

Static analysis result for SHA-256 d32687260374f858…

MALICIOUS

PDF

89.6 KB Created: 2021-09-06 22:45:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: f8398ea7770bbe8367fef76e9f0b0b35 SHA-1: 2f5d0005997d0d9ef3524fde3a51b3c9b3a8ccc4 SHA-256: d32687260374f8582a5daa74cc58b5b2a03ebab01e4b723711de6ccb7b97cd5c
156 Risk Score

Malware Insights

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

This PDF was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains a link farm pointing to numerous compromised WordPress upload directories, suggesting it's part of a phishing or malware distribution campaign. The document body is unreadable, but the presence of multiple unknown URLs indicates an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160de211bb496e---xoxumutexoduxuvopajibuv.pdf In PDF document text
    • http://ladue69.com/clients/876446/File/81147795240.pdfIn PDF document text
    • http://shinies.ru/img/lib/file/limakavajijo.pdfIn PDF document text
    • http://nasfthr.com/userfiles/file/zomixawetepanurufe.pdfIn PDF document text
    • http://zulassungsservice4you.de/bilder/file/xojimiwagatalixodokir.pdfIn PDF document text
    • http://charugarware.com/DEVELOPMENT/charu_garware/uploaded/userfiles/file/joluv.pdfIn PDF document text
    • https://shining4u.com/wp-content/plugins/super-forms/uploads/php/files/f89401edeeb36e1a96cff106ed815daf/nekofun.pdfIn PDF document text
    • http://bilagroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076b38701e20---40374109500.pdfIn PDF document text
    • https://debcopharma.com/userfiles/file/70618663067.pdfIn PDF document text
    • http://bnblspecialities.com/userfiles/files/xefuwegusozijakaduxizise.pdfIn PDF document text
    • http://lamgi.pl/ckfinder/userfiles/files/23882809540.pdfIn PDF document text
    • https://www.helpagesl.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609575ba066f7---95108951326.pdfIn PDF document text
    • http://beckydavidsonhomes.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080298540dee---32958159010.pdfIn PDF document text
    • https://goodmix-psc.com/userfiles/files/72071312602.pdfIn PDF document text
    • https://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/3dad09398f6891893a595b99ad827ec0/34842912071.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/jirafejuziba.pdfIn PDF document text
    • http://www.deadclan.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608917c66993a---fekuzajan.pdfIn PDF document text
    • http://7linc.com/uploadfiles/fckeditor/20210807/file/16282717041761.pdfIn PDF document text
    • http://bluecreator.biz/ckfinder/userfiles/files/lebalemetudi.pdfIn PDF document text
    • https://markmont.eu/editor_uploads/system/files/finodenukovexemovag.pdfIn PDF document text
    • http://kraski-chernila.ru/resources/file/26967633744.pdfIn PDF document text
    • http://busankid.com/webfiles/board/file///sixotexaza.pdfIn PDF document text
    • http://dohertylaw.net/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/lijodifojoxaxisi.pdfIn PDF document text
    • https://www.formwork.co.uk/wp-content/plugins/super-forms/uploads/php/files/5dt7saeghbl654eci4b8lsn1ft/vojuzedodaxa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=anatomy+trains+thomas+myers+pdf+downloadPDF 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_off0000f744.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF744 18368 bytes
SHA-256: 05bba10625148db7cff5ef312378f08a31bde32b8f58e1487b4bc8e46358dd9c
font_01_sfnt_off00012763.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12763 10944 bytes
SHA-256: fb218adabf1461b9f4bd600b3ea8af680e125ba341f79ecc55b0c2bc4bf4a4c4
font_02_sfnt_off000140a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x140A7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1