Malicious PDF — malware analysis report

Static analysis result for SHA-256 7fed0285bca492be…

MALICIOUS

PDF

84.0 KB Created: 2021-09-20 09:20:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: ee31b74f21ec7be6380fcac1f912bf4e SHA-1: 63debc9b89b76e7614892955cc8cf4d436743a04 SHA-256: 7fed0285bca492be63a42fc76683029496134b14d991a295ea1f277b0149e11e
204 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to multiple domains, many of which are associated with compromised CMS uploads or disposable hosting, suggesting an attempt to distribute malicious files. The presence of a 'download button' lure and the 'password-protected archive' heuristic further indicate a malicious workflow. ClamAV detection confirms the malicious nature of the file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://tevukasveza.lt/ckfinder/userfiles/files/69259912477.pdf In PDF document text
    • http://changjiujz.com/uploads/files/202109140734102267.pdfIn PDF document text
    • https://krusomying.com/data/file/96345319036.pdfIn PDF document text
    • http://mmsmarin.com/imgimage/file/xibanigogukudubawakepav.pdfIn PDF document text
    • https://baconbites.com/wp-content/plugins/super-forms/uploads/php/files/7i17evtnq7r1chl0f0vjbdq5b0/lelolonujog.pdfIn PDF document text
    • https://sfeerweter.nl/userfiles/files/97292082356.pdfIn PDF document text
    • https://pypconsultores.mx/userfiles/file/named.pdfIn PDF document text
    • https://shen-su.eu/gfx/userfiles/files/zujitixuvisisoxakamo.pdfIn PDF document text
    • http://haiqi-machine.com/d/files/8467291018.pdfIn PDF document text
    • http://www.nbrownies.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613da076c67f0---dutunamiwimirupet.pdfIn PDF document text
    • http://heyumpnd.com/userfiles/file///wutezeluwixemesasil.pdfIn PDF document text
    • https://weyergans-hcc.lv/userfiles/file/89155233619.pdfIn PDF document text
    • http://asirius.su/wp-content/plugins/super-forms/uploads/php/files/8a164922e5d0365c36872260fe51c1d9/lamakopogonupekomebobuti.pdfIn PDF document text
    • http://baliretreatcenter.com/olabali_ci/media/images/newsfiles/bopubup.pdfIn PDF document text
    • https://g-ortho.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16134ea0606d53---burovigonopitefapilawova.pdfIn PDF document text
    • https://adlinefor.com/home/webagen/public_html/korn/data/file/lopalilovipoxifikivan.pdfIn PDF document text
    • http://kennycojewelry.com/userfiles/files/202109/1631181060.pdfIn PDF document text
    • http://szerecsengyogyszertar.hu/editor_up/11719624160.pdfIn PDF document text
    • https://vleek.com/uploads/files/ponumaxolawedewatez.pdfIn PDF document text
    • http://vasekurzy.cz/userfiles/file/26754063121.pdfIn PDF document text
    • https://ist-lb1.istanajp.com/contents/files/51144907021.pdfIn PDF document text
    • http://basketaci.cz/UserFiles/File/16712520555.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=prince+of+persia+game+1989+downloadPDF 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_off0000dec9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEC9 11380 bytes
SHA-256: 1846edcafff2924f660ffb747416032016f678790f24a17818468dd40bcbbff8
font_01_sfnt_off0000f977.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF977 18544 bytes
SHA-256: f2e0e5cb5690f100abc850c682932153a1f34a173d5e433c04f398851bb04636
font_02_sfnt_off00012a2b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A2B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1