Malicious PDF — malware analysis report

Static analysis result for SHA-256 16ca9bba6875afb2…

MALICIOUS

PDF

84.8 KB Created: 2021-09-03 22:45:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 6a7ab96e5f3c558fe3414707369ea2d3 SHA-1: 311d95474005c097ca941c01d9ccd6f76662d6f3 SHA-256: 16ca9bba6875afb2711bffed3ae520d850a103f0873f7f70822156669edb93cb
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to lure users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9860

Heuristics 6

  • 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.
  • 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://lycee-elm.com/userfiles/file/99833102749.pdf In PDF document text
    • https://aftaplan.com/works/peepsparty/html/upload_files/file/nevexanemobubugipibuzi.pdfIn PDF document text
    • http://www.gabrielamaciel.net/images/content/file/50544878844.pdfIn PDF document text
    • https://rm-parketi.si/uploads/25694403935.pdfIn PDF document text
    • https://panificiopasticceriabattaglia.it/file/ruvonoluwadevumenavefov.pdfIn PDF document text
    • http://app8itebarandgrill.com/admin/images/file/27117058445.pdfIn PDF document text
    • http://abwcolley.com/uploads/files/zoter.pdfIn PDF document text
    • https://electrabicycles.pl/app/webroot/uploads/file/16269931666405.pdfIn PDF document text
    • https://gofropack.com/wp-content/plugins/super-forms/uploads/php/files/fc28f668831730ccda47a45d86c94c14/30745219227.pdfIn PDF document text
    • http://anhuizpyy.com/upload_fck/file/2021-8-9/20210809205656705253.pdfIn PDF document text
    • https://atiksigorta.com/files/66324585222.pdfIn PDF document text
    • https://mongolia-volkslift.com/uploads/files/xoguxejedezupitafaneko.pdfIn PDF document text
    • http://leakefamilyreunion.com/clients/63964/File/27754301962.pdfIn PDF document text
    • http://uyaviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e8ed092dc3---12934053652.pdfIn PDF document text
    • https://j-kowalewski.pl/uploads/userfiles/files/wudokokixakunox.pdfIn PDF document text
    • http://francisfamilyreunion.net/clients/870293/File/pijanolafid.pdfIn PDF document text
    • https://mikludava.lt/images/files/laluloxotim.pdfIn PDF document text
    • https://protradingindia.net/userfiles/file/xowavogaxaxuwarulota.pdfIn PDF document text
    • http://www.nbrownies.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606e94e2afed8---62524578231.pdfIn PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/4b9582c87fa3db2b33c29a88c50ab274/buwowaxegezogujiv.pdfIn PDF document text
    • http://thegioioto.store/upload/files/10000622345.pdfIn PDF document text
    • http://kulturazebrak.cz/userfiles/65496513465.pdfIn PDF document text
    • https://pearproperties.in/userfiles/file/pesojixibamiwosewilagesaw.pdfIn PDF document text
    • http://serendipityorlando.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c86ed4c6565---439596234.pdfIn PDF document text
    • https://kfz-gutachter-oliver-schiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/160966de95195c---wifuxux.pdfIn PDF document text
    • https://www.yoursurveysurveyors.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160c1731a2e047---jebuvagorutojefizekikaxe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=calgary+city+map+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_off0000e0c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0C7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f8de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8DE 10584 bytes
SHA-256: c475b2ad9e5541f8c152f6f7307fd39db6d68d65b088a113c22000f700ce3a6d
font_02_sfnt_off000110dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110DD 20480 bytes
SHA-256: 106703711b2aaabef8a91ba44292636c822186da3a59b51a47dfe968655cebf3