Malicious PDF — malware analysis report

Static analysis result for SHA-256 facd34d4cb4d354a…

MALICIOUS

PDF

76.7 KB Created: 2021-09-23 23:34:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: a33a12cf3b52a2fd134f66524a38add2 SHA-1: 758444bd0da7881147aea3625404146f41128ff6 SHA-256: facd34d4cb4d354a7fadeed4f83bedff04ccce43f54e4ecf979c36807948a880
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 uploads or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. The embedded JavaScript is likely used to facilitate the redirection or obfuscate the malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9827

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://queure.ru/uplcv?utm_term=pdf+qualitative+research PDF link annotation
    • http://ocung.net/img/files/pexezodajeriduzizipepuwi.pdfIn PDF document text
    • https://eclipsetheaters.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141bc5e7e237---62283073000.pdfIn PDF document text
    • http://dwallacelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/tuvamezufagaloka.pdfIn PDF document text
    • http://yuqiaohome.com/uploads/files/202109020700359142.pdfIn PDF document text
    • https://sipare.com.ar/wp-content/plugins/super-forms/uploads/php/files/q2smjiqfelgdt3u2219o5o7prb/jijudide.pdfIn PDF document text
    • http://freeorden.com/media/file/32751868588.pdfIn PDF document text
    • https://uleiuri.ro/userfiles/file/nofivigunid.pdfIn PDF document text
    • http://famcareconnect.org/wp-content/plugins/formcraft/file-upload/server/content/files/16136b923abf2f---40219048311.pdfIn PDF document text
    • http://stefanourso.com/public/userfiles/file/10132985592.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/bpsm5b1i1ehev0name5p5bv5c5/4228409119.pdfIn PDF document text
    • https://sindonis.com/userfiles/file/15441880774.pdfIn PDF document text
    • http://fence-alarm.com/userfiles/files/zedudumoxujipuwomax.pdfIn PDF document text
    • http://miamiwars.pl/wp-content/plugins/super-forms/uploads/php/files/93babc33159e4281e109965398f1250f/36291032175.pdfIn PDF document text
    • https://xn--1--8kcai1ck2bs.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/5b6e3728c034f6a0111d4cc029d4de44/ramepezi.pdfIn PDF document text
    • http://wellgroup.cz/UserFiles/File/97067370434.pdfIn PDF document text
    • https://vjlabor.pitscovn.com/uploads/Upload/files/82548632301.pdfIn PDF document text
    • https://nepoo.ro/app/webroot/files/userfiles/files/63425696938.pdfIn PDF document text
    • https://inprovitecuador.com/ckfinder/userfiles/files/fijawupo.pdfIn PDF document text
    • http://www.jacenter.org/js/ckfinder/userfiles/files/32275773384.pdfIn PDF document text
    • http://belniig.by/public/file/nitugulumukodebig.pdfIn PDF document text
    • https://fuoriscena.eu/file/dobopuj.pdfIn PDF document text
    • http://evohome.pl/userfiles/file/baximexanepuse.pdfIn PDF document text
    • https://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/16147e9ecb94e4---73715629560.pdfIn PDF document text
    • http://trevorhannant.com/91054041758.pdfIn PDF document text
    • http://epodhajska.eu/UserFiles/File/46339236043.pdfIn PDF document text
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/27294762382.pdfIn PDF document text
    • https://bititechnika.com/uploads/file/lenadugupojisuxor.pdfIn PDF document text
    • https://yp05.com/_UploadFile/Images/file/webegavareza.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_off0000c748.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC748 17420 bytes
SHA-256: cf227721092afbbf999bdca06a3de82ad0a643931c61804e63e1dd5cd0ef03bf
font_01_sfnt_off0000f49e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF49E 10660 bytes
SHA-256: 7f24f26e8b23fc8bf9329be6e2efc009192982d466495e415fe43ee9abd9860d
font_02_sfnt_off00010cfc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CFC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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