Malicious PDF — malware analysis report

Static analysis result for SHA-256 f5b2d1cbca347c3a…

MALICIOUS

PDF

82.2 KB Created: 2021-09-07 13:54:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: f2acefd1d11c66da602565f13fe9c821 SHA-1: d2b3219a461a04d0b0ed51a84533130fc4dbc1b3 SHA-256: f5b2d1cbca347c3a7f4746493a7766a303d40578ce0a837c9af59176a1ef6b9d
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier as malicious. It contains embedded JavaScript and numerous external URIs, many of which point to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users. The embedded JavaScript likely facilitates the redirection or further malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://norservis.com/files/files/xanusanumidakele.pdf In PDF document text
    • http://machinegroup.ru/img/outer/files/xerupe.pdfIn PDF document text
    • https://acronimocostanzo.com/userfiles/file/mepaw.pdfIn PDF document text
    • http://www.gametimecatering.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609287ba4fa45---dujesibegowag.pdfIn PDF document text
    • https://stomatoloska-ordinacija-rijeka.com/files/14466377765.pdfIn PDF document text
    • https://www.hospedeagora.com.br/wp-content/plugins/super-forms/uploads/php/files/gqa56ucgs19b2i5evdc1bfes7l/9309463939.pdfIn PDF document text
    • http://www.belladermeestetica.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16116e703817f7---webevobur.pdfIn PDF document text
    • https://andana.us/files/files/jawibiroromul.pdfIn PDF document text
    • https://lawtutors.co.uk/js/ckfinder/userfiles/files/kiwapavepizaxogidusumajez.pdfIn PDF document text
    • http://cosmic-kino.ru/sadm_files/fuvevevalazaf.pdfIn PDF document text
    • https://rhdplumbing.com/wp-content/plugins/super-forms/uploads/php/files/0ac3df2fb7871a16e6d10ebf9b20ff2b/22938103555.pdfIn PDF document text
    • https://givemeit.ru/wp-content/plugins/super-forms/uploads/php/files/5c73552ed4838df7a9e4efd2406aa8b6/rorakapadevuparibaf.pdfIn PDF document text
    • http://giga.sk/storage/file/63312729791.pdfIn PDF document text
    • https://abugfreemind.com/userfiles/file/denoj.pdfIn PDF document text
    • https://greenvalleykerala.com/ckfinder/userfiles/files/44796354142.pdfIn PDF document text
    • http://test.uebersetzungen-nesselberger.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606c94842de63---36466959200.pdfIn PDF document text
    • http://vattuxaydunghl.com/userfiles/file/21057841328.pdfIn PDF document text
    • http://myphamlulanjina.com/upload/files/xatulisolepug.pdfIn PDF document text
    • http://lawngo.net/fckfiles/81718634743.pdfIn PDF document text
    • http://dolinakrzeptowa.pl/public/upload/ckfinder//userfiles/files/vuvizirikanusatitifulixa.pdfIn PDF document text
    • https://dongcohonda.com/userfiles/file/giregilumoxakidobo.pdfIn PDF document text
    • https://www.nestroots.com/wp-content/plugins/super-forms/uploads/php/files/pqe44r6jaso7a6j29l4usk7do0/xemisemipoxul.pdfIn PDF document text
    • https://laxmigrouppune.com/wp-content/plugins/super-forms/uploads/php/files/92e29d0c7898bc174a23edb580b7a5ff/20906551435.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b5adcdea8df---38916381298.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=how+great+is+our+god+lyrics+pdfPDF 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_off0000db36.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB36 10980 bytes
SHA-256: 25e520963dee88a51c1432c11eb2f1d1f9dd5bddfef67df06ebbdf90456d7342
font_01_sfnt_off0000f4b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4B1 18020 bytes
SHA-256: 11a70e92e5b8bfea20c3dc27f73a7bb43badee5c2f8b491a5e9f9702aa195dd3
font_02_sfnt_off0001233a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1233A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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