Malicious PDF — malware analysis report

Static analysis result for SHA-256 28e5874f49e38153…

MALICIOUS

PDF

84.7 KB Created: 2021-09-01 18:38:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 43708e984145a6c452289661f419219a SHA-1: c727b039073aafb736d7b553a22deba968b08ebd SHA-256: 28e5874f49e381533a316a1a7ed5fb2bc117bc3a60750ac9bf9277f391c4aefd
164 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The file contains numerous links to external websites, many of which appear to be compromised or disposable hosting, suggesting a link farm designed to distribute further malicious content. The presence of a visual download button lure reinforces the phishing or scam nature of the document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://crewmak.ru/uplcv?utm_term=township+hack+mod+download PDF link annotation
    • http://rufullthrottle.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086218614d42---gafobadowemanexitopemed.pdfIn PDF document text
    • http://gocep.org/data/userfiles/files/varemoxikesozepafozufe.pdfIn PDF document text
    • http://freetourscadiz.com//ckfinder/userfiles/files/xibizavudagutixo.pdfIn PDF document text
    • http://hotelrefah4ter.ir/basefile/hotelrefah4terir/files/77013854122.pdfIn PDF document text
    • http://scheiden-maassluis.nl/uploads//file/lodumizilu.pdfIn PDF document text
    • http://osullivanspressurewashing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c56676939ca---23511996691.pdfIn PDF document text
    • http://washchienluoc.com/upload/file/tobajom.pdfIn PDF document text
    • https://hmv.ir/wp-content/plugins/formcraft/file-upload/server/content/files/16081210c2ab88---niramemaze.pdfIn PDF document text
    • http://fabrykakonwersji.pl/wp-content/plugins/super-forms/uploads/php/files/e63a88888758440e4a26fdba06f07e6f/dadejenizebitunemipererom.pdfIn PDF document text
    • https://www.aserspa.net/wp-content/plugins/super-forms/uploads/php/files/2j606d562mt34347nkrhbrk4va/zuridolatapukijokex.pdfIn PDF document text
    • http://ofipapel.org//ckfinder/userfiles/files/nuputurel.pdfIn PDF document text
    • http://orvosvalaszto.hu/uploads/files/27340701677.pdfIn PDF document text
    • http://elenasteele.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099d4659beac---76684515081.pdfIn PDF document text
    • https://ag-concept.ru/wp-content/plugins/super-forms/uploads/php/files/6f2e8c5a37c0611eff57ced579070a15/24940667620.pdfIn PDF document text
    • https://msr-hudsonproperties.com/wp-content/plugins/super-forms/uploads/php/files/46345a32f26de93a33db95eea66a650c/14935686321.pdfIn PDF document text
    • http://iaestedresden.de/userfiles/file/matofuloresaserowik.pdfIn PDF document text
    • http://brandnewgoods.net/userfiles/file/36819866416.pdfIn PDF document text
    • http://www.oknookna.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160c0219d0de75---nelitajaxekewilaboruduso.pdfIn PDF document text
    • https://shining4u.com/wp-content/plugins/super-forms/uploads/php/files/f660676a080ce35d95bd348f0cd8e5e9/tepogovenonawuk.pdfIn PDF document text
    • http://costruzionibulagna.it/userfiles/files/tuxasifezexafodadufizuji.pdfIn PDF document text
    • http://czechdidgeridoo.com/admin/upload/file/45759940684.pdfIn PDF document text
    • http://fvv-hohenfelde.de/sites/default/files/files/86540103731.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/kpp2mso7cht9ngkq23p2v42te1/74127765699.pdfIn PDF document text
    • http://www.polni.si/Images/files/durakeropelekezasaseridek.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_off0000e791.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE791 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ffa8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFA8 10592 bytes
SHA-256: aa2e9eaf24bd16309002e98906aa0f0929023ed5b1848452e6b515b1f3947d71
font_02_sfnt_off000117ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117AE 17716 bytes
SHA-256: 74ac72ec483b1c9265f4df24c4032c6dbd38b098945db7c0616e32162ea66c92

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