Malicious PDF — malware analysis report

Static analysis result for SHA-256 0409de31137727d5…

MALICIOUS

PDF

77.0 KB Created: 2021-09-02 11:49:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 0fc98d3408fa831e8d9d57fe31ab8a43 SHA-1: 8088087db5b0df314d797b3beb8cfaf225d8bbe1 SHA-256: 0409de31137727d5ad0025fe807f7ac60731f4abca1e095369f59c0db319905b
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Numerous heuristics indicate the PDF functions as a link farm, directing users to compromised CMS uploads and disposable hosting sites. The embedded URLs, such as 'https://allytemp.ru/uplcv?utm_term=descargar+libro+de+canciones+infantiles+pdf', are likely used to distribute further malicious content or phish for credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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 https://allytemp.ru/uplcv?utm_term=descargar+libro+de+canciones+infantiles+pdf PDF link annotation
    • http://woonhuislift.info/wp-content/plugins/formcraft/file-upload/server/content/files/1608a748fd37ee---5963241398.pdfIn PDF document text
    • https://empylean.com/wp-content/plugins/super-forms/uploads/php/files/fcu5b9dsqfnhnahr1k67da1dhd/jerepupexof.pdfIn PDF document text
    • http://cuoredicane.it/userfiles/files/vidodi.pdfIn PDF document text
    • http://giaexploring.it/userfiles/files/moxigazivutagaxogixeputo.pdfIn PDF document text
    • https://kimtuong.vn/isc/public/files/fckupload/file/72045823044.pdfIn PDF document text
    • http://mwflower.com/upimagesfile///47573063582.pdfIn PDF document text
    • http://soc-in.com/data/media/files/14397908269.pdfIn PDF document text
    • http://lamekatus.ee/uploads/ckeditor/files/bugudonabevefavupanipon.pdfIn PDF document text
    • http://project-lovcen.me/userfiles/file/47765277238.pdfIn PDF document text
    • http://bscartridge.com/pic/7765134102.pdfIn PDF document text
    • https://felix-schulze.biz/wp-content/plugins/super-forms/uploads/php/files/t25om79fmtipvu6uhfukcjouih/2149876211.pdfIn PDF document text
    • http://baodieptailor.com/uploads/2021-07-13/images/files/kotamemuniwuru.pdfIn PDF document text
    • http://cbcom.eu/ressource/site-image/files/fisabaziko.pdfIn PDF document text
    • https://ddriu.hu/wp-content/plugins/super-forms/uploads/php/files/7987dd6d1923bce69e703a4dc8c815ba/lotufalamigeweka.pdfIn PDF document text
    • http://ccsup.co.th/uploads/ckfinder/files/jidumeberagebovodes.pdfIn PDF document text
    • https://www.charityweiss.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607e0d2921f78---rojewubigebizetotamojog.pdfIn PDF document text
    • http://www.dnevi-sekretarjev.eu/wp-content/plugins/formcraft/file-upload/server/content/files/161273ed6a19b7---piwewepikok.pdfIn PDF document text
    • http://elonsummerstorage.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7cd64c7c0c---97165815094.pdfIn PDF document text
    • http://akbmodel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ddd47aee827---xakas.pdfIn PDF document text
    • http://rethabise.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160bed04170d71---xidozetafukuvolekefikege.pdfIn PDF document text
    • https://doitsolutions.co/wp-content/plugins/super-forms/uploads/php/files/7c49c27b594d0cbf6ebcd6afe4b3e27b/pizodutixadumipuvuzo.pdfIn PDF document text
    • https://ou-ravda.com/ckfinder/userfiles/files/fapijamoxogofim.pdfIn PDF document text
    • http://palami.by/images/file/pelax.pdfIn PDF document text
    • http://pytextiles.com/userfiles/file/vonabomo.pdfIn PDF document text
    • http://misosmile.com/upload/editor/files/74370110163.pdfIn PDF document text
    • http://stroytehcentr.ru/images/file/fivinonidinulepafelikunep.pdfIn PDF document text
    • 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_off0000c87c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC87C 18396 bytes
SHA-256: e89467b0f3acf7a06e49178e1ed9e14f17b731e76aec0823a7077f636236a6b3
font_01_sfnt_off0000f695.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF695 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010eac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EAC 10936 bytes
SHA-256: 98436acfe32075529070a51b95dbf7f426d61a1c626e7a52b3fba9de2554f2a7

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