Malicious PDF — malware analysis report

Static analysis result for SHA-256 1ea98948639d842e…

MALICIOUS

PDF

96.4 KB Created: 2021-09-01 21:54:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 0ff23ca4e214945407547eb493564ee5 SHA-1: 48a9350ccf2541378fc0806a738e04f95b1b9efd SHA-256: 1ea98948639d842e03d8b401c0dc4cc63906d6e264acf2dfa26fdf0d7c28acab
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains a link farm pointing to numerous unknown URLs, many hosted on compromised CMS uploads, suggesting an attempt to distribute malicious content or conduct phishing. The presence of multiple PDF_SEO_DISPOSABLE_LINK_FARM firings indicates a strategy of using numerous distinct, low-reputation domains.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9879

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://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a0f30676ff3---91313325179.pdf
    • http://saxonrt.hu/img/userfiles/files/susaj.pdf
    • https://apoc.com.au/wp-content/plugins/super-forms/uploads/php/files/afd51e581612676e018ec9db98a5e418/29157567449.pdf
    • https://ohligschlaeger-berger.de/wp-content/plugins/formcraft/file-upload/server/content/files/160fc12ea7bb81---xojevirevimize.pdf
    • http://canvangdientu.com/images/file/govapepu.pdf
    • http://gawhs80.com/clients/873705/File/wilur.pdf
    • https://jmcoverseaspvtltd.com/uploads/files/rumaruz.pdf
    • https://europeancustomtailor.com/wp-content/plugins/super-forms/uploads/php/files/ec2d6e2069aec62ac5905eb58d34d3b9/kabugug.pdf
    • http://naturalmis.com/userfiles/file/61699057617.pdf
    • http://slenderclub.cz/ckfinder/userfiles/files/81344125661.pdf
    • http://keralabiblesociety.com/fck_uploads/file/geloduxovixikekisam.pdf
    • http://mlsconsulting.net/cms/files/File/pulovujesusudijisis.pdf
    • http://a-range.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160db083e5725d---68818575315.pdf
    • http://www.idenet.net/wp-content/plugins/formcraft/file-upload/server/content/files/160f868b2264a6---11642659586.pdf
    • https://www.mercedesbenzofaustinservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084eefac062c---2571819747.pdf
    • http://bsbcarpet.com/userfiles/file/79512493492.pdf
    • http://chinawin-consult.com/userfiles/jufapi.pdf
    • http://eperon-kochersberg.com/img_db/69597580614.pdf
    • https://1877painters.com/FCKeditor/file/sipipepa.pdf
    • http://isisthailand.org/file_media/file_image/file/jazarovademaf.pdf
    • http://poorclarescork.ie/images/99217810933.pdf
    • https://triangle-electronics.com/assets/userfiles/file/71345392127.pdf
    • https://vibangnhadat.com/uploads/files/65240661459.pdf
    • https://avis-medical.ma/wp-content/plugins/super-forms/uploads/php/files/546f353c4f473b1e0404d310d527ef0b/27378870508.pdf
    • https://spazmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cd9838aaa62---79149730059.pdf
    • http://yejida.com/userfiles/file/vusokipenobalixunafi.pdf
    • http://www.christinemartin.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1611924fe3a779---85186241445.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=sure+thing+play+script
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010e13.bin
f476621a7be54ed5ca7fff3fb88fa99b26824b3e9e86ab40ee362ac08a960110
pdf-font-stream PDF embedded font (sfnt) at offset 0x10E13 10820 bytes
font_01_sfnt_off000126fb.bin
9d620d6cd57cc9b41e09d19f370d03d564e9568843b14ed3af78e1453b9ec6d3
pdf-font-stream PDF embedded font (sfnt) at offset 0x126FB 20012 bytes
font_02_sfnt_off00015b96.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x15B96 16792 bytes