Malicious PDF — malware analysis report

Static analysis result for SHA-256 ec71add92cdee825…

MALICIOUS

PDF

77.8 KB Created: 2021-09-17 22:04:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 31f9ca1f9eb457d816c3659dbf1dafdb SHA-1: 15e3ad520252dd08a28a0ad008da5a571b39c00b SHA-256: ec71add92cdee825a4edb758e521a3048c8586a3638c71d5c484e6a862ad1784
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised CMS upload directories. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a deliberate attempt to create a link farm on disposable hosting, suggesting a phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or delivering a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://oniceh.ru/uplcv?utm_term=current+date+and+time+mumbai PDF link annotation
    • https://art-gallery.mn/uploads/files/89073544887.pdfIn PDF document text
    • https://artistprasanna.com/userfiles/file/bekovikipubemebugareju.pdfIn PDF document text
    • http://ganan10.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/161342a1446a32---zipisaxoforib.pdfIn PDF document text
    • http://globalsublimation.net/uploadfile/files/morosujor.pdfIn PDF document text
    • http://srihemkuntsahibfgp.org/hemkunt/userfiles/file/17548889224.pdfIn PDF document text
    • http://diysmart.net/userfiles/file/55826986675.pdfIn PDF document text
    • http://fcvperu.org/data/fcvperu/userfiles/file/87258671036.pdfIn PDF document text
    • http://asr-net.ru/uploads/files/subajalanuwolarupan.pdfIn PDF document text
    • https://tndvn.com/js/ckfinder/userfiles/files/jalorimasatemo.pdfIn PDF document text
    • http://interwork.sk/userfiles/file/gikeraketi.pdfIn PDF document text
    • http://status.cz/UserFiles/File/lisetezalixizitivogigi.pdfIn PDF document text
    • https://www.seblocation.com/ckfinder/userfiles/files/81620963756.pdfIn PDF document text
    • http://giadinhlaurenso.org/upload/files/50023486597.pdfIn PDF document text
    • https://sdhouse.info/ckfinder/userfiles/files/22739893051.pdfIn PDF document text
    • http://kstarsmall.net/userfiles/file///kidewuna.pdfIn PDF document text
    • http://studiosimonepantaleo.it/userfiles/files/wuvijofemimidivitujip.pdfIn PDF document text
    • https://ymvii.com/admin/upload/files/52103447687.pdfIn PDF document text
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/bk554t3kkeopmm3gdpqtm257g5/kixujuwozeronepidosokoru.pdfIn PDF document text
    • https://sleepthai.com/piceditor/file/penonotapajigagedavavafon.pdfIn PDF document text
    • http://zjqzzx.com/uploadfile/file/2021091108090473499.pdfIn PDF document text
    • https://www.sesc.com.ua/wp-content/plugins/super-forms/uploads/php/files/9b9ed3d54bf98o99un2jbqnbk5/goramurefigusokepo.pdfIn PDF document text
    • http://schokofontaenen.de/idata/desusodidafawiwel.pdfIn PDF document text
    • http://chono.mn/uploads/userfiles/files/fadolasuxolizofibu.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_off0000cb11.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB11 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e328.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE328 10344 bytes
SHA-256: d5c8992650f1a0f9e54c000c3922665ee7aea83b306d5f0a6ab7892d7b75ecb2
font_02_sfnt_off0000fa74.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA74 17552 bytes
SHA-256: 5cf2583348776715717315d2ac300a90535f2934a162d33a6d3e349d9dfc9602

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