Malicious PDF — malware analysis report

Static analysis result for SHA-256 538ba67fe826b01f…

MALICIOUS

PDF

95.2 KB Created: 2021-09-05 00:47:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 7edaf83a54982d84fe15bba4f87330be SHA-1: a2698af924a529a19ba29ed7ca5bb5f221e6d370 SHA-256: 538ba67fe826b01fa3911fb026e044b9a1319b19c78700976889612734cb87d2
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers 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 uploads. The presence of numerous URLs, many pointing to potentially malicious or compromised domains, strongly suggests an attempt to redirect users to phishing or malware-hosting sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9927

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://africansafaris-spain.com/FCKeditor/editor/filemanager/connectors/php/connector.php?Command=FileUpload&Type=File&CurrentFolder=%2Ffile/xonejajizufividovaxiw.pdf In PDF document text
    • https://medicinasolidale.org/wp-content/plugins/super-forms/uploads/php/files/bf7c770b6b8afe994a4a232bf99225a0/79024364701.pdfIn PDF document text
    • https://wpsqld.com.au/wp-content/plugins/super-forms/uploads/php/files/994d4d9f6942b1af60393852782c4561/tedoj.pdfIn PDF document text
    • http://primaneighbors.com/userimages/gepasexapojebiboveras.pdfIn PDF document text
    • http://eco-versute.com/app/webroot/ckfinder/userfiles/files/pagetivelonavizo.pdfIn PDF document text
    • http://changju-hotel.com/CKEdit/upload/files/29992974144.pdfIn PDF document text
    • http://www.consorcio.edu.pe/wp-content/plugins/formcraft/file-upload/server/content/files/160708802450fd---nafanuropi.pdfIn PDF document text
    • https://ceilford.org/wp-content/plugins/super-forms/uploads/php/files/64cf0bc8f01f3e3224123d454098474f/fidogetijimabaxidoti.pdfIn PDF document text
    • http://www.peplex.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607bb5857270b---17499352506.pdfIn PDF document text
    • https://hightechrustremovers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160d3959d713f0---nidive.pdfIn PDF document text
    • https://luyenthitoeic.info/userfiles/file/12820254430.pdfIn PDF document text
    • https://guapa2.com/admin/fck/file/satibuzukixotamo.pdfIn PDF document text
    • https://bykevin.com/wp-content/plugins/super-forms/uploads/php/files/adc7807b634b635b1be5d4bfa25ec845/53894800082.pdfIn PDF document text
    • http://windcampus.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac48dd70b3f---neriba.pdfIn PDF document text
    • http://www.lauricedale.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16070d0f4c6435---kupexikazabovilalifeke.pdfIn PDF document text
    • https://teenvolunteerdallas.org/wp-content/plugins/super-forms/uploads/php/files/02d5f3c952b61d1895458c4c09c11989/towubububoxa.pdfIn PDF document text
    • https://www.actionconstructionjax.com/wp-content/plugins/super-forms/uploads/php/files/4b16f5e8f2583708343653ed6bcbe5dd/fuwafibipijodiwipogim.pdfIn PDF document text
    • http://aqs-group.it/userfiles/files/8343312729.pdfIn PDF document text
    • https://agilitynd.com/wp-content/plugins/super-forms/uploads/php/files/f88374b9a8e36b47625b0af60b58feed/59630996528.pdfIn PDF document text
    • https://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/66ff15e44ef4ebc7e7c35dc6cd98dc1c/dosikeximebafogaraxunap.pdfIn PDF document text
    • https://www.endthestigmacounselling.com/wp-content/plugins/super-forms/uploads/php/files/atgf36aqfncek2gl8f55g8tfut/60203574844.pdfIn PDF document text
    • https://carthink.org/wp-content/plugins/formcraft/file-upload/server/content/files/161275b3d730d4---4435904214.pdfIn PDF document text
    • https://daleel.global/wp-content/plugins/super-forms/uploads/php/files/r1j2ffdrku27hsnv8h3ikctv0j/38504260869.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=thermex+emh%C3%A6tte+manualPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off000139de.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x139DE 17944 bytes
SHA-256: d20dc40a8eef52537008cc17aee0ca02198cbcc33195aab048d47b4a2060cd62
font_00_sfnt_off0000ee85.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE85 20164 bytes
SHA-256: f57bf397de2bafb3a303bccf4ee1ca600876660b2443d6d4fad0c5194d2f0690
font_01_sfnt_off000122a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122A2 10416 bytes
SHA-256: 7a91402d357fe50d9394db2bac0e55fd3bdda59aa380b8cab7d35c6000107c6d
font_03_sfnt_off00015573.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15573 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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