Malicious PDF — malware analysis report

Static analysis result for SHA-256 de35e17215477eec…

MALICIOUS

PDF

87.1 KB Created: 2021-09-12 13:46:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: fb9a4775cd8b8f96aa26ac68cce5c8b9 SHA-1: 49b827d771e09da591483a1c2cbac5a29eb85b08 SHA-256: de35e17215477eec2a7a9eaa6e46b9ed61559b19595019c390444abe50f6aa8e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to multiple domains, several of which appear to be compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. No scripts were extracted, but the presence of numerous external links suggests an attempt to redirect the user to malicious content or downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://matricula.netlandschool.cl/files/44200111455.pdf
    • http://mikllc.mn/uploads/files/gunatenugisukigik.pdf
    • http://ahlhy.com/uploads/file/041113362502.pdf
    • http://arqing.es/ckfinder/userfiles/files/webibirijukigizupil.pdf
    • http://igigeothermal.jp/userfiles/file/kekofovitejadelolakule.pdf
    • https://loffoxfitness.mvwebsolution.com/userfiles/files/sexuboxetilaxeb.pdf
    • http://chromavials.com/d/files/fudorupogetutovuvoju.pdf
    • http://slhospital.com/upload/fckeditor/file/fukin.pdf
    • http://muzycznescyzoryki.pl/userfiles/file/27997294809.pdf
    • https://shibbirs.com/media/files/tinudanijijemibugogalo.pdf
    • http://dentalcenterstudio.it/userfiles/files/11472869185.pdf
    • http://partnercable.com/files/53633055253.pdf
    • http://cec-intl.ru/app/webroot/files/file/14351808720.pdf
    • http://charivne.info/images/file/jetuvonuxinewedojofugo.pdf
    • https://grandhotelushba.com/userfiles/file/lejuvetu.pdf
    • http://www.akutrans.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132e092bae67---sosifajidulogopifixif.pdf
    • http://akcjonariusz.com/UserFiles/file/garorodiwutuliku.pdf
    • http://lamelove-zakryti.cz/userfiles/file/49616503322.pdf
    • http://jumpstart.mobi/ckfinder/userfiles/files/79319049839.pdf
    • http://bernardthevenet.fr/ckfinder/userfiles/files/95561145961.pdf
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/d2c3b2d2c500ab668676f2d0c17b60a2/27270421334.pdf
    • https://adesso-moosburg.de/images/file/kadobixiwevidosoxaniz.pdf
    • https://sierrainstruments.cn/fckeditor/editor/filemanager/connectors/php/fckeditor/upload/202109/file/zotolavefatilufobapux.pdf
    • http://www.tecnotrefg.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613cf9e044479---92563271651.pdf
    • http://sadiqandsons.com/userfiles/files/8094806566.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=download+story+saver+for+instagram+story+assistant
    • 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_off0000ea06.bin
ad7ec076615dcc702cc8dbc503a5a48a1d3efadfe8e1e9609181e473b3b4cb71
pdf-font-stream PDF embedded font (sfnt) at offset 0xEA06 10964 bytes
font_01_sfnt_off00010355.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10355 16792 bytes
font_02_sfnt_off00011b67.bin
afdb02bc39a5a965a8ac94edbb310058aa8d1672468de88bab83bf0b578a22a4
pdf-font-stream PDF embedded font (sfnt) at offset 0x11B67 19760 bytes