Malicious PDF — malware analysis report

Static analysis result for SHA-256 6a71f477ba748a34…

MALICIOUS

PDF

81.2 KB Created: 2021-09-17 12:09:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 57e0eaa6a478933d02cd192ff8d0bbd5 SHA-1: 178f2a075a97c57739d674eb95b07d20afb284c3 SHA-256: 6a71f477ba748a346d870ee54ad9e0e871515478e118819ce8871c7ac13d5772
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous external links, many pointing to compromised websites or domains associated with link farms. Heuristics indicate a high likelihood of malicious intent, with ClamAV specifically identifying it as a 'Pdf.Phishing.Trojan'. The presence of multiple links on potentially untrustworthy hosting suggests an attempt to lure users to malicious sites for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 https://www.luthier-auxerre.fr/ckfinder/userfiles/files/vodefavape.pdf
    • https://collinite.pl/userfiles/file/4393313449.pdf
    • https://keongracun.org/contents/files/123693231.pdf
    • https://nceptionsolutions.com/wp-content/plugins/super-forms/uploads/php/files/9d3232efb5c04daf942b2a8427e03619/jovafopajibox.pdf
    • https://rippa.pt/files/file/rizilutezer.pdf
    • http://chono.mn/uploads/userfiles/files/11718331891.pdf
    • https://www.toptalentusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613cf99b34b04---foliwesijofuvedojibasi.pdf
    • http://maroba-zirndorf.de/file/87764976204.pdf
    • https://idealist.ro/userfiles/file/61466489370.pdf
    • http://konferencii.org/web/uploads/assets/file/53457697506.pdf
    • http://4bx.pl/public/file/28854974380.pdf
    • https://weilmclainboiler.ca/fck_upload/file/95692386378.pdf
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/f38976eacf22f53b6cefcf3d09b185e7/vubenijaxubodi.pdf
    • http://totaleclipsenv.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140f2a5a63ce---42594659395.pdf
    • http://nousgarage.com/userfiles/file/80589666331.pdf
    • https://baongochoa.com/upload/file/sunolisuzuvixopivofosuw.pdf
    • http://architettoseneca.com/userfiles/files/bemozasujupudosivuxufani.pdf
    • http://midoriku.zaitakunet.jp/app/webroot/upload_images/files/2916660841.pdf
    • https://winstar-tools.com/UserFiles/editor/file/90036102256.pdf
    • https://brukspec.pl/upload/file/36873457080.pdf
    • https://posaonakosovu.com/ckfinder/userfiles/files/pegofonuwapegibalezo.pdf
    • http://www.dawnrotaryclub.tw/UserFiles/files/40375237948.pdf
    • https://mchs.kz/userfiles/File/94005571842.pdf
    • https://cjsc.se/ckfinder/userfiles/files/sikiwupuxusegosominiso.pdf
    • https://akamercedes.com/images/uploads/files/tefomusorijixeg.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=continuum+hypothesis+fluid+mechanics+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_off0000d6ae.bin
8dd1e50c4a2931267f1326ec51da7b9d912cff5b21a9b314f81e62b61b6b844c
pdf-font-stream PDF embedded font (sfnt) at offset 0xD6AE 17796 bytes
font_01_sfnt_off00010537.bin
69df2222aa9e8521eda8f3e2b3ea02b1bbaff093f82ee2d797cf3ca7ffd21186
pdf-font-stream PDF embedded font (sfnt) at offset 0x10537 11028 bytes
font_02_sfnt_off00011ec8.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11EC8 16792 bytes