Malicious PDF — malware analysis report

Static analysis result for SHA-256 0b10dd1d2b37204e…

MALICIOUS

PDF

70.0 KB Created: 2021-09-29 05:48:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 96263f98f72f82e32abd4b873309f390 SHA-1: d5d643d871c5b53b63ff0550fb8008457eff4d24 SHA-256: 0b10dd1d2b37204e73cf04e85400b078a443067e2a2c2c628d2c62cae061d929
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external links, many pointing to compromised CMS upload directories or disposable hosting, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The embedded JavaScript likely facilitates the redirection to malicious sites or the download of further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://perfecthospital.org/ckfinder/userfiles/files/16907534387.pdf
    • https://marathonblainville.com/userfiles/files/29775837518.pdf
    • http://wizclub.net/upload/userfiles/file/13571852384.pdf
    • https://vietnamairlinescorp.org/js/ckfinder/userfiles/files/27380741529.pdf
    • http://traktor-tv.de/sites/default/files/file/kerurikijaxalok.pdf
    • http://dulichtantai.com/files/uploaded/files/lexigozasazejolakemol.pdf
    • http://www.anjhimayath.com/upload/file/38585320574.pdf
    • http://ssanadia.in/userfiles/file/xegupuzunu.pdf
    • https://reformedgeneration.com/userfiles/file/70733365235.pdf
    • https://doosradashak.in/ci/userfiles/files/kunipebavapes.pdf
    • http://brno-skoleniridicu.cz/ckfinder/userfiles/files/jidebinudalirotudekili.pdf
    • http://thienthaopc.com/upload/FCK/file/65490801063.pdf
    • http://bassonconsulting.mc/userfiles/file/rikal.pdf
    • http://ckm-machinery.com/userfiles/files/tegumawivele.pdf
    • https://www.lorenzofranzone.it/wp-content/plugins/super-forms/uploads/php/files/5ccf241d4b6fbcf88a53b1b463319ce5/kedozuredoneraxikifaveboz.pdf
    • http://bangladeshceramicsociety.com/uploads/editor/files/54445187572.pdf
    • http://uat.ideadunes.com/projects/ideadunes-portfolio-site/wp-content/plugins/formcraft/file-upload/server/content/files/1614e3ab35e448---rudume.pdf
    • https://brokenspoke.com/wp-content/plugins/super-forms/uploads/php/files/2692306357a465412726dcdff73c8fdd/mixobamajuregasujedetaku.pdf
    • https://kimcert.com/E/file/28613578760.pdf
    • http://smartcookieacademy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614fd2d549190---zodux.pdf
    • https://marblobath.com/app/webroot/img/files/14271769021.pdf
    • http://indagosrl.it/userfiles/files/88736260814.pdf
    • https://toscanafantastica.com/userfiles/file/15598325418.pdf
    • http://www.afamaresme.org/wp-content/plugins/formcraft/file-upload/server/content/files/16140cea5be044---47143521962.pdf
    • https://idfusionllc.com/wp-content/plugins/super-forms/uploads/php/files/fb6a6811accbbaf9a5bad2364d1732b4/16220204754.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=apk+of+free+fire+2021
    • 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_off0000b50e.bin
41c3e5548900feadd75ae694161da6da23a29c4646ffdb0818d54d20994ff82c
pdf-font-stream PDF embedded font (sfnt) at offset 0xB50E 10140 bytes
font_01_sfnt_off0000cbe5.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xCBE5 16792 bytes
font_02_sfnt_off0000e3f7.bin
6aae3da7fc88e00af8adbff3143f0ae354a0d4b7d595e6030e305ae2eefaa66c
pdf-font-stream PDF embedded font (sfnt) at offset 0xE3F7 15216 bytes