Malicious PDF — malware analysis report

Static analysis result for SHA-256 605d64ca30c78893…

MALICIOUS

PDF

80.2 KB Created: 2021-09-07 18:19:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 641296e822fa2e85bbd7c66b8c59ae05 SHA-1: b708906b31ea29a0158aa80d0865f54db13d1e40 SHA-256: 605d64ca30c788939799e8e3eb4332087c5d2bf84c9f18cfc79d5ff02aefb966
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple external websites, some hosted on compromised CMS platforms. The document body is heavily obfuscated, preventing a clear understanding of its specific lure, but the presence of numerous URLs suggests an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://archism.ru/uplcv?utm_term=nfl+football+schedule+2019+pdf PDF link annotation
    • http://eluvial.com/sites/all/sites/eluvial.com/files/zifobamerinubolivapenije.pdfIn PDF document text
    • https://portsidestrategies.com/wp-content/plugins/super-forms/uploads/php/files/4fc54c96be3c8470284513f4653aa28c/31069323022.pdfIn PDF document text
    • http://giasudaihocsupham.com/Images_upload/files/46511219362.pdfIn PDF document text
    • https://www.wroclawmodelshow.pl/ckfinder/userfiles/files/85219814626.pdfIn PDF document text
    • http://ohdiabo.net/images/ckeditor/files/38337276992.pdfIn PDF document text
    • http://phutungvespaco.com/luutru/files/sibuwuzafutumorituzege.pdfIn PDF document text
    • https://ensasoft.com.tr/wp-content/plugins/super-forms/uploads/php/files/es0043eovvnlgivfpbia8v45ql/julisajapatijoronosipe.pdfIn PDF document text
    • http://goteneplast.se/files/images/file/lufevobuperaluge.pdfIn PDF document text
    • http://sdsenlex.com/upload/files/vabitunujikuturepazi.pdfIn PDF document text
    • http://smartcookieacademy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160addd5081bd8---58652458257.pdfIn PDF document text
    • http://slenderclub.cz/ckfinder/userfiles/files/fogoz.pdfIn PDF document text
    • https://fundreamz.com/ckfinder/userfiles/files/vujudiw.pdfIn PDF document text
    • https://realwebguys.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135c90c2c05e---dapitavaniguxiro.pdfIn PDF document text
    • https://mttrasportisrl.it/dati/upload/file/fumefidixegubojevan.pdfIn PDF document text
    • http://fredericjean.net/oplusco/file/92905312574.pdfIn PDF document text
    • http://vinacafe-dalat.com/Images_upload/files/lerureviwoxof.pdfIn PDF document text
    • http://cbgnfinance.com/userfiles/file/69811675406.pdfIn PDF document text
    • http://www.deadclan.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b00931393b4---42294870031.pdfIn PDF document text
    • https://art-eria.pl/mandarynka/pliki/files/joxosafofodatagukuvufez.pdfIn PDF document text
    • http://olsztyntransportmedyczny.pl/userfiles/file/kererudiratosoruw.pdfIn PDF document text
    • https://thegioidongphuc.net/ckfinder/userfiles/files/75198939962.pdfIn PDF document text
    • http://www.tsssport.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608032be28418---42311109115.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_off0000d589.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD589 11100 bytes
SHA-256: 921cb36748f825c7a2d175e4cd607e405bcb3342268e8bcf62dd25bbbfc4fd0b
font_01_sfnt_off0000ef78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF78 16968 bytes
SHA-256: 0fc26bd10d27b7d68d8dddb897f1ad309ffb18da484662b9d89bc32481778966
font_02_sfnt_off00011bba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BBA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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