Malicious PDF — malware analysis report

Static analysis result for SHA-256 c485a50998a9cc9b…

MALICIOUS

PDF

86.6 KB Created: 2021-09-23 08:45:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 2672f8f61faab660e55020792f194c56 SHA-1: 73cedbd55737753d06dbfd370678221018b6077d SHA-256: c485a50998a9cc9bea79421912e0f3a29916080533c383e6073dbabebdaccf95
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to multiple disposable hosting sites, a common tactic for distributing malicious payloads. The 'SE_PASSWORD_ARCHIVE_LURE' heuristic indicates the document likely instructs the user to download a password-protected archive, a method used to evade initial security scans. While no scripts were directly extracted, the presence of PDF link farms and the password archive lure strongly suggest a phishing or malware distribution attempt.

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
  • 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://yushendesign.com/images_fck/file/1630644603.pdf In PDF document text
    • http://greenlivinggarden.com/htdocs/UserFiles/file/64594794697.pdfIn PDF document text
    • http://iehyun.com/editorupload/file/vobiriroxijugijobunug.pdfIn PDF document text
    • http://jd6618.com/jd6618/file/2021-9/file/LwpCms2021_09_08_10_24_47_8118.pdfIn PDF document text
    • http://studiorestagno.eu/userfiles/files/toramiruzokekirudajolo.pdfIn PDF document text
    • http://orthodoxnews.us/file/29600421809.pdfIn PDF document text
    • https://penzionradvanice.cz/res/file/85116595702.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/1612f94f7eeec5---40620717779.pdfIn PDF document text
    • https://www.ezhealthcheck.com/wp-content/plugins/super-forms/uploads/php/files/uf0nc7u4u3t6hi0c8qh19brrcq/66619720053.pdfIn PDF document text
    • http://gaia-onlus.org/userfiles/file/marejolevib.pdfIn PDF document text
    • http://lblussana.it/images/file/mosinasimozakan.pdfIn PDF document text
    • http://bc-arman.kz/ckfinder/userfiles/files/sogeremaf.pdfIn PDF document text
    • http://chekeeh.ir/basefile/chekeehir/files/rofomufiwirokesogu.pdfIn PDF document text
    • http://architettosbaffo.com/userfiles/files/5613153735.pdfIn PDF document text
    • http://roycraft.ca/userfiles/file/pidesopufinovupo.pdfIn PDF document text
    • http://onmamtour.com/FileData/ckfinder/files/20210911_C5063926958AE9CE.pdfIn PDF document text
    • https://sanipro.ma/app/webroot/uploaderfiles/lijanokine.pdfIn PDF document text
    • http://bigdoughpizza.com/uploads/files/fevulanobuxud.pdfIn PDF document text
    • http://kystop.com/wp-content/plugins/super-forms/uploads/php/files/1a6541c2ea9dfa8817b8aa2e4d03b23b/zobitates.pdfIn PDF document text
    • http://aleeblog.com/wp-content/plugins/super-forms/uploads/php/files/utse121if16t7nenm4abj6d0q1/lomoxidaxupizi.pdfIn PDF document text
    • https://noelex22.org/userfiles/file/68193486810.pdfIn PDF document text
    • http://npas.ru/pic/file/wagovozowejuf.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=android+how+to+clear+cookiesPDF 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_off0000ec99.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC99 10624 bytes
SHA-256: cec462738b5a96ea7fabe167c86ebd03f9e71f2ff62109f2acf5a059c1acf841
font_01_sfnt_off000104e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104E7 18620 bytes
SHA-256: 98be0a33f887f5610a850e2491c873f32134c96dd83ac21a39a09a471731d00c
font_02_sfnt_off000134db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x134DB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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