Malicious PDF — malware analysis report

Static analysis result for SHA-256 ca8dcd6436b449ec…

MALICIOUS

PDF

82.2 KB Created: 2021-09-22 23:37:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: c9c7810647e177a07b5ded62f6c52b27 SHA-1: 04f20d7ecab1d45723858524573cc97430758f9d SHA-256: ca8dcd6436b449ece68e8bd19c3d3a780b3ddb3a67adb207446011e1e7d5ba13
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF sample contains embedded JavaScript, a common technique for executing malicious code within PDF documents. The presence of multiple links pointing to compromised WordPress sites and other domains suggests a phishing or redirection campaign. The ClamAV detection and ML classifier further confirm its malicious nature, likely serving as a lure to download further payloads or phish credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://www.pietri-automobiles.com/wp-content/plugins/super-forms/uploads/php/files/ku27nuh2d3vinlc5hop3ci052k/xizexefexazuvanusetuzod.pdf In PDF document text
    • https://zhansq.cn/upload/file/xaruregat.pdfIn PDF document text
    • http://ocvitlucky.com/vietkiendo/upload/file/52660922816.pdfIn PDF document text
    • https://t4g.nasscomfoundation.org/wp-content/plugins/super-forms/uploads/php/files/0vpvecof49kp4jshdhjh6lsir6/67990392903.pdfIn PDF document text
    • https://lajovisena.com/gallery/file/24103249166.pdfIn PDF document text
    • http://interface-referencement.com/userfiles/file/rudesuderuwizuruzuge.pdfIn PDF document text
    • https://idfusionllc.com/wp-content/plugins/super-forms/uploads/php/files/8638697bfc35e525cb8ed2b6bcc07612/gusavadoguvotivokova.pdfIn PDF document text
    • https://kasihpaham.com/contents/files/vubebiwo.pdfIn PDF document text
    • http://geology.ie/wp-content/plugins/formcraft/file-upload/server/content/files/16138941301e0b---1712238705.pdfIn PDF document text
    • https://www.tri-or.fr/tri-or/ckfinder/userfilesfiles/9051088506.pdfIn PDF document text
    • http://donaldnathanlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/52627186833.pdfIn PDF document text
    • https://nepalmicrofinancesummit.org/userfiles/files/89643629864.pdfIn PDF document text
    • http://househouse.it/userfiles/files/vimaveluwosilitemonowodim.pdfIn PDF document text
    • https://buonoantonio.it/userfiles/file/lusime.pdfIn PDF document text
    • http://dharmapuridiocese.com/svnprojects/DHD/Source/images/files/75953517858.pdfIn PDF document text
    • http://zaun-produzent.de/userfiles/file/bemetaxotelevojatew.pdfIn PDF document text
    • https://menlopark.com/wysiwygfiles/file/43298098205.pdfIn PDF document text
    • http://www.stsmcc.org/www/js/ckfinder/userfiles/files/popupuligosufegowegovisad.pdfIn PDF document text
    • http://russkiivopros.com/images/FCKeditor/file/pujarudesufalobefiji.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/209e0a8348e577aeffa0d013b349fb62/lokizevarogeru.pdfIn PDF document text
    • http://www.kidnuri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614878c667021---40263712219.pdfIn PDF document text
    • https://www.nhabe.com.vn/ckfinder/userfiles/files/vuzebikuvovagesabavemaxa.pdfIn PDF document text
    • https://emtracing.net/userfiles/file/46257265790.pdfIn PDF document text
    • http://tuhocxuatnhapkhau.com/uploads/ckfinder/files/62637947411.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=sesiones+de+educacion+fisica+primaria+pdfPDF 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_off0000d528.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD528 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ed3a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED3A 20932 bytes
SHA-256: c0aa2ac6c30b681822642165fcb14419d7127d450b70639a9f9a01f1407da23f
font_02_sfnt_off0001227a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1227A 10812 bytes
SHA-256: 76d16fc87443a881dc53a1988f807cd32aed9ef9df585f63d7ba77f5b4f42ed4

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