Malicious PDF — malware analysis report

Static analysis result for SHA-256 df205ac25d03e3a6…

MALICIOUS

PDF

69.1 KB Created: 2021-09-26 04:06:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: fa4c8a3682d8ae5b6d1b0b38143156f2 SHA-1: b9cd1a3b65e42ebc2a6a54a41415e4c5477d677e SHA-256: df205ac25d03e3a67d225d6c00ceaf4be01495de855579cd2af56955d52d911e
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains embedded JavaScript and numerous external URIs, many of which point to disposable hosting or compromised CMS upload directories, indicating a link farm designed to redirect users. The embedded JavaScript likely facilitates the redirection or exploits vulnerabilities to download further payloads. The ML classifier and ClamAV detection strongly suggest malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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 http://testplanet.nl/uploads/files/26468565447.pdf
    • http://volkshilfe-vlbg.at/images/content/files/14913987153.pdf
    • https://smg.bid/ckfinder_userfiles/files/6214580591.pdf
    • https://gertiesbloomers.com/kousumi/nulook/upload/fckimages/file/kaxusum.pdf
    • http://www.civilhospitalpalampur.in/img/uploads/files/53177490055.pdf
    • https://sowlindia.com/userfiles/file/15033513476.pdf
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/1bc0a4664f35cf46531af82fb64cb7c9/78180933256.pdf
    • https://linker.tw/files/70536594039.pdf
    • http://plenaseguroseprevidencia.com/fotosempresa/files/76943891325.pdf
    • http://elazentrale.de/images/uploaded/file/pubomarat.pdf
    • http://robertoantoniz.com/resources/original/file/larobed.pdf
    • http://mauchlineware.com/html/chapelstreet/web/userfiles/files/83143622415.pdf
    • http://riph.pl/userfiles/file/samuduxavigob.pdf
    • http://www.homefacelifters.com/wp-content/plugins/super-forms/uploads/php/files/5c679b4a45d7e18d00a9a974fc63006c/sowefelilofawilage.pdf
    • http://www.patricktennis.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613c96d5ca9bd---62697527469.pdf
    • http://jedwines.com/cmsCart/upload/file/43081672313.pdf
    • http://thanglong.vn-greenenergy.com/ckfinder/userfiles/files/pazagotopuximedaxiza.pdf
    • https://dammesliepas.lv/ckfinder/userfiles/files/55830084055.pdf
    • http://infas.cz/images/wiswig/file/30530744734.pdf
    • https://oykufestivali.com/ckfinder/userfiles/files/61433572163.pdf
    • http://nantong.chinatupai.com/web/js/ckfinder/userfiles/files/wusojixorelobovedukurez.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=fairy+tail+season+1+kissanime
    • 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_off0000af8e.bin
1ab1e6a51aa17a0784eae1f74286476033db7298e500619834652563d2675c74
pdf-font-stream PDF embedded font (sfnt) at offset 0xAF8E 10504 bytes
font_01_sfnt_off0000c780.bin
60255f9c0f96419173aa98a46e976c25627a775c61e4bcc24a19f590abb05ee9
pdf-font-stream PDF embedded font (sfnt) at offset 0xC780 14904 bytes
font_02_sfnt_off0000ed46.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xED46 16792 bytes