Malicious PDF — malware analysis report

Static analysis result for SHA-256 88613e8ea93265ba…

MALICIOUS

PDF

77.8 KB Created: 2021-09-23 22:38:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: bf9ac9b01f4655f756d4229ca3b66323 SHA-1: 320770b547a25967a6c6b77c2d31cbc884f72dc0 SHA-256: 88613e8ea93265bae9291aac8c108f47b68c3aff541c687cefd027cc4d227859
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for executing malicious code within documents. It also features a link farm pointing to numerous distinct hosts, several of which are identified as compromised WordPress upload storage or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

Heuristics 7

  • 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.
  • 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 https://zohopin.com/calisma2/files/uploads/52765550896.pdf In PDF document text
    • http://itena.si/uporabnik/file/zitonotiluvuvupijamakod.pdfIn PDF document text
    • http://unityproductions.com/upload/files/tiwutido.pdfIn PDF document text
    • http://videlec.be/ressource/file/gakabikezafabunigenuloj.pdfIn PDF document text
    • http://www.medicalalliedtraining.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f07df39154---38903500704.pdfIn PDF document text
    • http://haisushitogo.com/uploads/files/zijewi.pdfIn PDF document text
    • https://aynispirit.nl/userfiles/file/ruzas.pdfIn PDF document text
    • http://sjmhospital.org/files/js/ckfinder/userfiles/files/ridasekusod.pdfIn PDF document text
    • http://laarakkers.com/ckfinder/userfiles/files/gefesojisawubike.pdfIn PDF document text
    • http://sp3siemianowice.pl/userFiles/files/tasorubaxalinerusexut.pdfIn PDF document text
    • http://megatex-plast.ru/pub/file/satunazezonuma.pdfIn PDF document text
    • https://www.vconsole.com/ckfinder/files/lofodasij.pdfIn PDF document text
    • https://ckmandarin.com/uploads/xedabolejovaxinesebajol.pdfIn PDF document text
    • http://bluecreator.biz/ckfinder/userfiles/files/kiduwovazo.pdfIn PDF document text
    • https://maloneslandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131b0f1564af---17348433309.pdfIn PDF document text
    • http://cmorshomecareassociates.org/uploaded_files/userfiles/files/sijetazilejegujenu.pdfIn PDF document text
    • http://ridendo.cz/files/file/dutugajedugabopan.pdfIn PDF document text
    • http://corkpotters.com/images/51121209356.pdfIn PDF document text
    • http://www.risingstars.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16141983c29c4c---raxukosutaju.pdfIn PDF document text
    • https://mountmoriahcamp.com/media/wabew.pdfIn PDF document text
    • https://mps-india.com/userfiles/files/9760785677.pdfIn PDF document text
    • https://cr2tek.com/userfiles/Proj_Name/files/63323619392.pdfIn PDF document text
    • http://vitacanes.com/uploads/files/vimetuxukafegul.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=comment+installer+une+sonnerie+sur+androidPDF 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_off0000ccd2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCD2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e4e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4E4 17956 bytes
SHA-256: 21a9f62ca0745be04a74c280f1b565f1c5144eaec38f7388520bfa9994ca4d05
font_02_sfnt_off000111ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111AC 10540 bytes
SHA-256: c63fdfea2acd3a2bcd505f07fd19012a9286400425ed74dacccbf1582356b543

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