Malicious PDF — malware analysis report

Static analysis result for SHA-256 5c720124f14e545e…

MALICIOUS

PDF

85.2 KB Created: 2021-09-09 00:58:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: c397cd62bba817421f4a19b090f17de0 SHA-1: 1bac7571cd06df2e55c12c3422147aad346a817d SHA-256: 5c720124f14e545eac881f4500eafb6c4d3782eb308594dd4d4d4aa7bbbf2e9a
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating it is likely a phishing or trojan delivery mechanism. The presence of numerous external URIs, including links to compromised CMS uploads and disposable hosting, suggests an attempt to redirect users to malicious content. The 'SE_DOWNLOAD_BUTTON' heuristic further supports the idea that the document is designed to trick users into clicking a download link.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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.
  • 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 https://ketchas.ru/uplcv?utm_term=mobile+movie+mp4 PDF link annotation
    • http://smenergy.kr/uploaded/file/1229747017612f16368d535.pdfIn PDF document text
    • https://naveenent.com/administrator/imagetemp/file/25240605350.pdfIn PDF document text
    • https://refundsrefunds.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ef97080a36---60119062106.pdfIn PDF document text
    • http://xn--b1agjlwjc3g.xn--p1ai/ckfinder/userfiles/files/38433610122.pdfIn PDF document text
    • http://zjhywt.com/images/upload/File/65418331825.pdfIn PDF document text
    • https://www.weboonline.com/ckfinder/userfiles/files/xaragumumogunusula.pdfIn PDF document text
    • https://phatgiaolongan.com/upload/ckupload/files/50155143205.pdfIn PDF document text
    • http://csc-028.com/userfiles/file/20210905081613_961w20.pdfIn PDF document text
    • http://seritour.com/rsm/files/pekatenevef.pdfIn PDF document text
    • https://kamarkosong.com/contents/files/luvefazetawenosovilolow.pdfIn PDF document text
    • https://mobile-translator.eu/app/webroot/media/files/josovetedinemewuke.pdfIn PDF document text
    • http://dreamsurgerycn.com/ckupload/files/63917478679.pdfIn PDF document text
    • http://heathrowairporttaxi.website/userfiles/file/33527230803.pdfIn PDF document text
    • https://coachtourbusrental.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613514868eb78---56981455636.pdfIn PDF document text
    • http://graciaindoutama.com/kingkong/userfiles/files/51588643978.pdfIn PDF document text
    • https://cqhuaan.myhost360.cn/upload/files/09-08-09-21-05-79.pdfIn PDF document text
    • http://umffz21.ru/admin/ckfinder/userfiles/files/roduwiniluzitubufe.pdfIn PDF document text
    • http://sirmamedia.com/ckfinder/userfiles/files/bikopur.pdfIn PDF document text
    • http://nuklearmedizin-amro.de/userfiles/file/lamuvadaxefazedonoji.pdfIn PDF document text
    • https://wacee.net/wp-content/plugins/formcraft/file-upload/server/content/files/1612fef48673c5---57911616187.pdfIn PDF document text
    • https://kayakbranson.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138f7ee3e9a9---lanawidojojafatadupop.pdfIn PDF document text
    • https://fpcofmacon.com/nbloom/fckuploads/file/sowesapasuvumefo.pdfIn PDF document text
    • 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_off0000e944.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE944 18368 bytes
SHA-256: ff35b6365b65852aac27dc80a4ac6faef987da572a5a2bca0f6a32409e5d3cb5
font_01_sfnt_off0001192d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1192D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013144.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13144 10060 bytes
SHA-256: bfc7cff31ece488ed36f12718600eb5c6fc88c38413ab39a3490ac5e3ce3d44b

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