Malicious PDF — malware analysis report

Static analysis result for SHA-256 8ee5264c2da9fc5e…

MALICIOUS

PDF

96.4 KB Created: 2021-07-23 13:06:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 6c6e0569582fef37d8263a3097d16d4f SHA-1: ada9322f27e28697581aa82d6dcefe52d2ef18c4 SHA-256: 8ee5264c2da9fc5e2e2c5043d59c645a5c566ae777f522ccf861ae1a004ca622
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites utilizing the Formcraft plugin for file uploads. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware delivery through these links. The document body is heavily obfuscated and unreadable, providing no direct user-facing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/160918fdc75950---ligedonivubujinamaguwij.pdf In PDF document text
    • http://short-story.ru/upload/file/fujuminukuga.pdfIn PDF document text
    • http://zgkimsteszew.pl/img/upload/files/vewigasemegivodiporerub.pdfIn PDF document text
    • http://ptairsupply.com/userfiles/file/pidaturodenutedivilimeva.pdfIn PDF document text
    • http://mirembeestate.co.ug/wp-content/plugins/formcraft/file-upload/server/content/files/160b13128f32ab---56953426656.pdfIn PDF document text
    • https://ijpdua.com/contents//files/57704405079.pdfIn PDF document text
    • http://thehawthornnyc.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e9f34d1cc8---sokoferebegutisutujufu.pdfIn PDF document text
    • http://www.putnamtaxi.net/wp-content/plugins/formcraft/file-upload/server/content/files/160d4a65b9f9da---banuvoxusetepalaj.pdfIn PDF document text
    • https://studiorampinelli.com/file/27633759338.pdfIn PDF document text
    • http://www.kocay.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1609fb275a2994---55934100063.pdfIn PDF document text
    • https://cottonweb.net/userfiles/file/vonawuzelobofoloribum.pdfIn PDF document text
    • https://kaptenhoki.com/contents//files/41317487116.pdfIn PDF document text
    • https://planet-for-events.de/userfiles/file/51383780344.pdfIn PDF document text
    • http://barcabianca.eu/upload/file/kufoguluvurafefegemobi.pdfIn PDF document text
    • http://reszke.pl/fckeditor/editor/filemanager/connectors/php/file/98973784216.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/3082285959.pdfIn PDF document text
    • https://gea99.com/ckfinder/userfiles/files/98209070049.pdfIn PDF document text
    • https://eduinfinite.com/wp-content/plugins/super-forms/uploads/php/files/b3dca5e30e992aa1ecf2c4d892dd7e43/jelelibol.pdfIn PDF document text
    • https://dacoma.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16093e10ed34c1---davidikiwupe.pdfIn PDF document text
    • http://dnepropress.net/files/file/vakotutipabizij.pdfIn PDF document text
    • https://foodsafebox.com/ckfinder/userfiles/files/joribe.pdfIn PDF document text
    • http://www.77ice.com/upload/files/wexovuwepafufixu.pdfIn PDF document text
    • https://soechi.com/userfiles/file/vimuj.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=poisson%27s+equation+from+gauss+lawPDF 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e550.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE550 1676 bytes
SHA-256: d03db559901a3ecff2bbd1a29d1ed226e24ce3a283915f7823ab8873681e7b6f
font_01_sfnt_off0000ed44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED44 23184 bytes
SHA-256: 5eda94a552d14688eeb63424b836870889155fca9212985fb0db03d95d9d679e
font_02_sfnt_off0001295f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1295F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00014176.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14176 10924 bytes
SHA-256: ad50cb9e10c42bef310f645a71158e8b482dc657dd40715f6592e0f0a63c66b6
font_04_sfnt_off00015a95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15A95 16660 bytes
SHA-256: ca30625dab959a50de0c4ffec78676ffb2f3ea3c405f90f01a23543ebc9dc284

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