Malicious PDF — malware analysis report

Static analysis result for SHA-256 fd88d46f0784e8e5…

MALICIOUS

PDF

81.3 KB Created: 2021-09-10 02:49:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: dbf2880b9e75074056d726459b8d7463 SHA-1: a30854308c862c5f51c734589a3653a273845463 SHA-256: fd88d46f0784e8e583c378931246a55dbbb590a3ffe1e73f70b3437f762a56ef
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to various disposable hosting sites, a common tactic for phishing or malware distribution. The heuristic 'SE_PASSWORD_ARCHIVE_LURE' indicates the document likely instructs the user to open a password-protected archive, a method used to bypass gateway security. While no scripts were directly extracted, the PDF structure and link farm suggest an attempt to deliver a malicious payload, likely a trojan as indicated by ClamAV.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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
  • 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.
  • 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://dreiseengrundschule.de/files/puzozisaxegezif.pdf In PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/i023h04usbsj8a5a3lc7lt9k11/82627676209.pdfIn PDF document text
    • http://pileki.com/imgup/file/javelidaka.pdfIn PDF document text
    • http://dobraukraina.org/sites/all/sites/dobraukraina.org/files/pigiwuruxaxefenexeromepi.pdfIn PDF document text
    • http://teresachild.com/upload/files/tixijakogo.pdfIn PDF document text
    • http://www.lavalledesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131c6a424295---48654642704.pdfIn PDF document text
    • https://saftanton.dk/wp-content/plugins/formcraft/file-upload/server/content/files/161329fa9d47f7---28393184816.pdfIn PDF document text
    • http://vasvaripalmuzeum.hu/upload/file/11212797679.pdfIn PDF document text
    • https://fsbulletsandbrass.com/userfiles/files/sexusebapuxegiwomijid.pdfIn PDF document text
    • https://hosvagyok.hu/userfiles/file/katepurinose.pdfIn PDF document text
    • https://brillimet.com/uploads/files/202109060951124609.pdfIn PDF document text
    • http://quatangsongvan.com/hinhanh_fckeditor/file/55305965921.pdfIn PDF document text
    • http://togul.org/sites/default/files/file/pelomeru.pdfIn PDF document text
    • http://madiagranitosilano.it/userfiles/files/54001378437.pdfIn PDF document text
    • https://edenestates.com/ckfinder/userfiles/files/fafabikotifidofolisepik.pdfIn PDF document text
    • http://vinhomeshaiphong.net/app/webroot/img/files/95182537296.pdfIn PDF document text
    • http://handbook.hu/upload/page/file/40018812233.pdfIn PDF document text
    • http://adhdadvisory.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f32289e8fe---puxikagoxopefawezokizajit.pdfIn PDF document text
    • http://cbcom.fr/ressource/site-image/files/vufupenivafafezokolo.pdfIn PDF document text
    • http://mazdooradda.com/userfiles/file/papodurokerav.pdfIn PDF document text
    • http://www.hptindia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f003024ace---80747408719.pdfIn PDF document text
    • https://www.supremecaravans.com.au/application/third_party/ckfinder/userfiles/files/sekalulebejuxijezusov.pdfIn PDF document text
    • https://12shio4.com/contents/files/80338118143.pdfIn PDF document text
    • http://reiki-roots.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1612ea9ec175d7---45494800086.pdfIn PDF document text
    • http://moscreen.in/cmsfiles/file/laguwemupomafotoligirezu.pdfIn PDF document text
    • https://gobelsprofil.com/upload/files/50757069019.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=marvel+ultimate+alliance+psp+isoPDF 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_off0000d75e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD75E 18664 bytes
SHA-256: e88bf200ff6ae0a3a3dbd75591cfa2c6b6b15c664ff42273d93ac911373546f9
font_01_sfnt_off000106a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106A5 10692 bytes
SHA-256: c5f7105c60013e74756912348d3e475eb8b020f48729b7ca0da32f3e1c5e8746
font_02_sfnt_off00011f31.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F31 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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