Malicious PDF — malware analysis report

Static analysis result for SHA-256 45a62d17da34da89…

MALICIOUS

PDF

100.0 KB Created: 2021-08-04 05:22:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: ecbd187b3aa84a4bd495db028cc72899 SHA-1: 17150e451727e5b0cfa5204d269603a29b79dd88 SHA-256: 45a62d17da34da893d4da292d1989220e55880d603409f6082bac2651ff52b40
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, exhibiting characteristics of a phishing lure impersonating cloud storage services. It contains embedded JavaScript and numerous links to external PDFs hosted on various domains, including compromised WordPress sites and IP addresses, suggesting an attempt to deliver a secondary payload or conduct phishing. The presence of embedded JavaScript indicates potential for malicious code execution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 9

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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.
  • Cloud document impersonation lure medium SE_CLOUD_DOC_LURE
    Document impersonates a cloud file-sharing service such as SharePoint, OneDrive, Google Drive, Dropbox, Box, or Microsoft 365 and asks the user to open, verify, or access a shared document
  • 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://cssh.es/img/file/bigugidil.pdf In PDF document text
    • http://quimis.org/js/ckfinder/userfiles/files/96666769177.pdfIn PDF document text
    • http://bjsixiang.com/jingkelun/userfiles/files/20210729234138.pdfIn PDF document text
    • https://webhostmurah.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608000ac3380c---89354432191.pdfIn PDF document text
    • https://abcoegypt.com/userfiles/files/buwora.pdfIn PDF document text
    • https://travels-ukraine.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e0cfd3e240---54219077879.pdfIn PDF document text
    • http://amwordpress.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607048cb8413c---63400185881.pdfIn PDF document text
    • http://79.170.40.182/boothtastic.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c6e5247204---34061676688.pdfPDF link annotation
    • http://cncforginghammer.com/d/files/90046910531.pdfIn PDF document text
    • http://handbook.hu/upload/page/file/46604145563.pdfIn PDF document text
    • https://www.hungryalex.com/wp-content/plugins/super-forms/uploads/php/files/ae0fc096391d99b46b67e4400554fc31/92418547223.pdfIn PDF document text
    • https://stcatherine.ac.ug/wp-content/plugins/formcraft/file-upload/server/content/files/160a37a72abf63---38179721041.pdfIn PDF document text
    • https://semineebrasov.ro/printuri-fi/files/kopuzisepijoxeg.pdfIn PDF document text
    • http://smartdeal.pl/files/upload/files/89224693204.pdfIn PDF document text
    • https://www.spreefahrten-berlin.de/wp-content/plugins/super-forms/uploads/php/files/vi2brc70nqp4c5pdpki7c6qo95/bulewogitubenibuwapi.pdfIn PDF document text
    • http://gancza.pl/userfiles/file/18983816128.pdfIn PDF document text
    • http://www.jimenez-casquet.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b60a62a59e5---leromiromaziwuzigogefum.pdfIn PDF document text
    • http://yjsyrj.com/userfiles/file/kowatoregal.pdfIn PDF document text
    • https://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c0271a849b0---juluzovoredafijo.pdfIn PDF document text
    • http://dabien.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/1607798222809d---23004328711.pdfIn PDF document text
    • http://baharemadinah.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afbe4117f25---4645838869.pdfIn PDF document text
    • https://growyourmoney.in/userfiles/files/somivakadobudedaduri.pdfIn PDF document text
    • https://ekselantechnology.solutions/ckfinder/userfiles/files/pegowofavepetuk.pdfIn PDF document text
    • https://c4ir.ae/wp-content/plugins/super-forms/uploads/php/files/5uat6d16f39rqada6ro03nfb62/99124144437.pdfIn PDF document text
    • https://regalcabs.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608a3b8bec5bb---zetitazositopijit.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=download+microsoft+office+professional+plus+2010+product+key+generatorPDF 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_off00011dfa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DFA 18512 bytes
SHA-256: 4d232abb4da0ae0309d8c93d11f6507ac4dbfeb64388f9713eaf4b6591a6236f
font_01_sfnt_off00014cdc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14CDC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000164f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x164F3 11648 bytes
SHA-256: fc39ec79d8899b5212852411de064aa7b9bc5f044db2ecaca4cb849f5d0b6926