Malicious PDF — malware analysis report

Static analysis result for SHA-256 c7d44e2fa00d8fd7…

MALICIOUS

PDF

75.8 KB Created: 2021-09-12 20:05:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 895ef435be4e48580240d1aa677059c8 SHA-1: fb5c9eca9fb4eca57124613f97fb4ed538a26515 SHA-256: c7d44e2fa00d8fd7413ebbf4562779867ede74cdbee74c22b7d135b65dbb0c05
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous external URIs and link farm heuristics, indicating an attempt to redirect users to potentially compromised websites. The presence of embedded URLs and the nature of the heuristics suggest a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://garglob.ru/uplcv?utm_term=the+room+old+sins+apk PDF link annotation
    • https://oazapiekna.com/zdjecia/fck/file/petilumoniwelunekato.pdfIn PDF document text
    • http://luisacortesearchitetto.it/userfiles/files/duzof.pdfIn PDF document text
    • http://fli.edu.mn/ckfinder/userfiles/files/1823625934.pdfIn PDF document text
    • https://valkexclusief.reviewz.eu/app/webroot/files/userfiles/files/28102315302.pdfIn PDF document text
    • http://greatwalledmond.com/ckfinder/userfiles/files/furixebojuweviluzata.pdfIn PDF document text
    • http://cameragiaminh.com/upload/files/fedapimanavami.pdfIn PDF document text
    • http://zhongyuemedia.com/filespath/files/20210911192408.pdfIn PDF document text
    • http://blekinge.boj.se/uploads/userfiles/files/nutelo.pdfIn PDF document text
    • https://www.carlosfunes.es/wp-content/plugins/formcraft/file-upload/server/content/files/16139e8057caca---85484650077.pdfIn PDF document text
    • http://ilovehikari.com/uploads/files/burunab.pdfIn PDF document text
    • http://rebeccafantarchitetto.it/userfiles/files/17247272420.pdfIn PDF document text
    • http://celesteandtorsten.wedding/images/file/memuwakavufuzikukan.pdfIn PDF document text
    • https://booking-news.hkdnracing.com/webroot/editor-uploads/files/47747006660.pdfIn PDF document text
    • http://rajhansnursery.com/userfiles/file/lobowananurazafo.pdfIn PDF document text
    • https://eclipsetheaters.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133c30b05694---21050555718.pdfIn PDF document text
    • http://tichdiem.surecare.vn/uploads/userfiles/file/86508821131.pdfIn PDF document text
    • http://dispensapertutti.com/userfiles/files/41297661976.pdfIn PDF document text
    • https://costarica4d.com/contents/files/wadibaz.pdfIn PDF document text
    • https://vargyasnekonyveles.hu/kepek/other/file/xijina.pdfIn PDF document text
    • http://progettogeometra.it/userfiles/files/39590877762.pdfIn PDF document text
    • https://deconkhoemanh.com/wp-content/plugins/super-forms/uploads/php/files/524c1lvtovq50rg7i288uhrf1j/46134858286.pdfIn PDF document text
    • https://instalacje-elektryczne.net/ckfinder/userfiles/files/25462328674.pdfIn PDF document text
    • http://okzawidow.pl/img/upload/files/43803508182.pdfIn PDF document text
    • https://careerroots.net/ckfinder/userfiles/files/zefazovenobuvopa.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_off0000c561.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC561 17392 bytes
SHA-256: ed688c32d74e8b537c732884b3b9040208a4ef41a07d89f7ec5efd43aa848eb4
font_01_sfnt_off0000f234.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF234 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010a4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A4B 10616 bytes
SHA-256: a647e18299a955541b76808baf818fdd8d8414395634de2256b47996735018e3