Malicious PDF — malware analysis report

Static analysis result for SHA-256 78a80f15fe4810bc…

MALICIOUS

PDF

79.9 KB Created: 2021-09-22 11:16:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: c092412b707009e95033f0e2d96da551 SHA-1: 7586bd6d0d19b97920cb53349389a1f2beb183db SHA-256: 78a80f15fe4810bc8dd5487a658dce5d3ee04ff0c7e46761fb55f5088c4a1ca4
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and numerous external URIs, many of which point to compromised CMS upload storage or disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the document is designed as a link farm, likely to direct users to malicious content or phishing sites. The ML classifier and ClamAV detection strongly suggest malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://pixomot.ru/uplcv?utm_term=como+poner+anuncios+en+aplicaciones+android PDF link annotation
    • http://csptech.net/admin/userfiles/file/96887231852.pdfIn PDF document text
    • http://studiotecnicomartani.eu/userfiles/files/26112655885.pdfIn PDF document text
    • http://crisismobile.com/ckfinder/userfiles/files/patipeloralabuba.pdfIn PDF document text
    • http://ahjygjg.com/upload_fck/file/2021-9-11/20210911121851363029.pdfIn PDF document text
    • http://stlnsk.ru/uploads/file/fidivika.pdfIn PDF document text
    • https://thic.net/plugin/ce1/ckfinder/userfiles/files/guzitipebeno.pdfIn PDF document text
    • http://daieimotors.com/js/upload/files/30352062644.pdfIn PDF document text
    • http://oguzlarotomatiksanziman.com/depo/sayfaresim/file/33256974412.pdfIn PDF document text
    • https://askisan.daynexdemo.tk/upload/files/72930788840.pdfIn PDF document text
    • http://bitree.net/ckfinder/userfiles/files/novaboladepalizuvojek.pdfIn PDF document text
    • https://al-wesam.com/userfiles/files/xexetalekum.pdfIn PDF document text
    • http://midesignvn.com/uploads/files/nasesixakagukologijukuni.pdfIn PDF document text
    • http://ambvetsanprospero.eu/userfiles/files/32103184049.pdfIn PDF document text
    • http://lamekatus.ee/uploads/ckeditor/files/93597555695.pdfIn PDF document text
    • https://majubesar.net/contents/files/dutilupegelujutut.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142100e8df60---58946418975.pdfIn PDF document text
    • https://dermo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142b329c1e83---binupofinonop.pdfIn PDF document text
    • https://polymadeniyaglar.com/fckeditor/userfiles/file/kezifozabat.pdfIn PDF document text
    • http://pyhunlian.com/uploadfile/file/wulelirepuguwarakizetipot.pdfIn PDF document text
    • http://krzeptowski.pl/file/21777642509.pdfIn PDF document text
    • http://gourmethousemacau.com/UploadFilesfile///bazirutubujega.pdfIn PDF document text
    • http://ozdermusavirlik.net/userfiles/file/nunare.pdfIn PDF document text
    • https://sketchup360.vn/wp-content/plugins/super-forms/uploads/php/files/puahkt6hpl1cdlkantdgst9kss/sexuwukumojavola.pdfIn PDF document text
    • http://ijiantu.com/filespath/files/20210921015633.pdfIn PDF document text
    • http://amicissiapiemonteisa.it/userfiles/files/5743568493.pdfIn PDF document text
    • https://cosonnguyenthanh.vn/webroot/userfiles/files/tovulinujaxerabubij.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_off0000d0ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0EA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e8fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8FC 18104 bytes
SHA-256: 431fefb911356529e245ea141ddd703fe2a0b0e6bc872f3a66c5d4efda9d36b8
font_02_sfnt_off0001176e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1176E 10708 bytes
SHA-256: 6dabc585a3f18482f7fe5b6f1273108ba62bdf5a6e7cd692e352c4f11216b1f4

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