Malicious PDF — malware analysis report

Static analysis result for SHA-256 2fce1d4ce07f5653…

MALICIOUS

PDF

82.5 KB Created: 2021-09-02 02:58:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: 9845190f090e57ece8a6df907898455f SHA-1: 65ae0cca1a819f0a04a864ff91ba26f38cd1e401 SHA-256: 2fce1d4ce07f5653f2162919de9909fec1424a770655ce07585f88f60ab0e64b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs, many of which point to domains associated with link farms or compromised CMS uploads. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware delivery. The file's structure and URL distribution align with techniques used to obscure malicious destinations and evade basic detection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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 https://happycolaborativo.com/uploads/files/17444432956.pdf In PDF document text
    • https://koltoztetes-szallitas-lomtalanitas.com/ckfinder/userfiles/files/bimasukorezeboz.pdfIn PDF document text
    • http://www.radiopopiatej.com/wp-content/plugins/formcraft/file-upload/server/content/files/160831aa6c6901---12592006082.pdfIn PDF document text
    • http://teakdeck.pl/files/file/vinerar.pdfIn PDF document text
    • http://tl-maskinfabrik.dk/userfiles/file/kuwexirunuzudipudi.pdfIn PDF document text
    • http://anhopphat.com/uploads/files/zopufunawoguf.pdfIn PDF document text
    • http://cybernet.asia/UserFiles/File/62488089586.pdfIn PDF document text
    • http://adveotec.com/img/file/dupadaw.pdfIn PDF document text
    • http://zussobrance.sk/grafika/dokumenty/34213656216.pdfIn PDF document text
    • https://incoyun.com/calisma2/files/uploads/80542703907.pdfIn PDF document text
    • http://myphamlulanjina.com/upload/files/87320453907.pdfIn PDF document text
    • http://koreanhotpot.com/uploads/files/dojijatix.pdfIn PDF document text
    • http://pantryscan.com/123cars/imagefck/file/89947331844.pdfIn PDF document text
    • https://useoneconvo.com/wp-content/plugins/super-forms/uploads/php/files/fae760785e628af59eb254a8118cfa98/83689699910.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/1610474de62e0c---pafimatotoxavenalul.pdfIn PDF document text
    • https://euchebnici.com/img/file/sibupatoj.pdfIn PDF document text
    • https://itracmediav5.com/ckfinder/userfiles/files/kugos.pdfIn PDF document text
    • http://nitexprofi.cz/userfiles/file/zoxodeveko.pdfIn PDF document text
    • https://wheelmartthailand.com/image/upload/File/datefupugawega.pdfIn PDF document text
    • http://ne-moloko.ee/wp-content/plugins/super-forms/uploads/php/files/a0829b76a97d4e3e2fa9e6e13fefc5ca/pupolaveropadatu.pdfIn PDF document text
    • https://cavalier-hundezucht.ch/userfiles/file/47828516400.pdfIn PDF document text
    • http://krevue.cz/UserFiles/File/82508182528.pdfIn PDF document text
    • http://suportti.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c0b8f931495---kivegiz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=stress+strain+questions+and+solutionsPDF 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_off0000dad9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAD9 10560 bytes
SHA-256: 72438638eefeabd47e5abb4c262746fcf179e511327be51beef782c7ea529f85
font_01_sfnt_off0000f2c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2C9 18860 bytes
SHA-256: 9e7d8bdeee854e5a5b0e588683a527cd3538099a532e6678abe933a37060f41b
font_02_sfnt_off000123f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123F1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1