Malicious PDF — malware analysis report

Static analysis result for SHA-256 940cc0a69d81da53…

MALICIOUS

PDF

82.8 KB Created: 2021-09-16 23:14:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a48f131564e6015b4243834cb92454ac SHA-1: 730ec24f23f7d74c5fe6f237176ff44954783ce6 SHA-256: 940cc0a69d81da531707e9fb879661a0a3cb62951866fd9adec08e23b765556f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF containing numerous embedded URLs, many of which point to compromised WordPress sites. Heuristics indicate a link farm on disposable hosting, suggesting a phishing or malware distribution lure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or trojan delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

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://themultifold.com/wp-content/plugins/super-forms/uploads/php/files/8dtt11cohs4s7f3s156pe9dvl2/dagutexik.pdf
    • http://kraljicabih.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614102fa30e00---tuvinuruxofejuz.pdf
    • http://gwardiajuvenia.pl/zdjecia/fck/file/20417469284.pdf
    • http://chapelguild.com/images/usr/zudis.pdf
    • http://smepil.com/ckeditor/userfiles/files/24712776297.pdf
    • https://myshalewell.com/userfiles/file/zumadak.pdf
    • http://orderbestwings.com/uploads/files/18799545976.pdf
    • http://gleb777.com/fck_upload/file/wutivafawazugavonaz.pdf
    • http://dharmapuridiocese.com/svnprojects/DHD/Source/images/files/mupizubuwerawumozozo.pdf
    • https://presstone.hu/userfiles/file/bavemo.pdf
    • http://pelejas.com/IMAGENS/CKFINDER/files/46810615010.pdf
    • http://vdi.vn/userfiles/file/bijapa.pdf
    • http://losmarinoslanzarote.com/marinarubicon/admin/file/jonaponuvilafedipotodev.pdf
    • http://sinostandards.net/upload/files/85376449260.pdf
    • http://gpp300.fr/userfiles/file/dopugoropevaregusudedu.pdf
    • https://roadtoring.com/wp-content/plugins/super-forms/uploads/php/files/5313ad8621e5cce8876a52fdc7e1e8ca/7878089976.pdf
    • https://tucsonhomewindowtint.com/wp-content/plugins/super-forms/uploads/php/files/2c9045a28e6034ac7842e9b968623009/bakofiwa.pdf
    • http://longbeach.ilovepokebar.com/uploads/files/kasofulegutat.pdf
    • http://theydeserveastamp.org/wp-content/plugins/formcraft/file-upload/server/content/files/16140e42384be8---jarugivupefu.pdf
    • https://hotelite.in/userfiles/file/57554863192.pdf
    • http://jawarakreasi.com/file/11934565664.pdf
    • http://american-security-inc.com/assets/ckfinder/userfiles/files/newuxaba.pdf
    • http://csc0311.com/userfiles/file/20210901183637_alo1ag.pdf
    • https://almuhja.net/ckfinder/userfiles/files/lerijabaretigefodapezoz.pdf
    • http://ride-on-earth.com/images/blog/file/fuvaku.pdf
    • http://jtylek.pl/Upload/file/47812952290.pdf
    • https://www.la-providence-ehpad.fr/ckfinder/userfiles/files/givusawuwugoxowenazegegem.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=analisis+transaccional+pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dfb4.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xDFB4 16792 bytes
font_01_sfnt_off0000f7c6.bin
d2928bdedc6b0bf56033596dc60deb9c4c53e7a645e823a1ab8cea30edefd750
pdf-font-stream PDF embedded font (sfnt) at offset 0xF7C6 18308 bytes
font_02_sfnt_off000125fb.bin
4b451301c90f4d934af5a0b22fc41de989c85028fd445f542da7e5c92423b08f
pdf-font-stream PDF embedded font (sfnt) at offset 0x125FB 10460 bytes