Malicious PDF — malware analysis report

Static analysis result for SHA-256 c04c97aae3844e3a…

MALICIOUS

PDF

85.4 KB Created: 2021-09-07 17:02:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 295a70836dc10c0d1809093b5806d35b SHA-1: 3fa81c230855fc9db688ec0682a477532eb93444 SHA-256: c04c97aae3844e3a5d2edebe7d13f262e8f91df0681eafc28700e68abb168d22
176 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. Numerous embedded URIs were extracted, many pointing to compromised WordPress sites or disposable hosting, suggesting a phishing or malware distribution campaign. The document body was unreadable, but the heuristics strongly indicate the file's purpose is to redirect users to malicious external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://drafthe.ru/uplcv?utm_term=culegere+matematica+bac+2018+paralela+45+pdf PDF link annotation
    • http://ahlhy.com/uploads/file/031212071120.pdfIn PDF document text
    • http://anaminfo.com/attachfile/file/6921163939.pdfIn PDF document text
    • http://prime42.ru/userfiles/files/kedafefijupir.pdfIn PDF document text
    • https://markiza-trade.ru/admin/ckfinder/userfiles/files/35983296104.pdfIn PDF document text
    • http://104.156.58.56/~web2inbox/wp-content/plugins/formcraft/file-upload/server/content/files/160a8de228aa89---73059120461.pdfPDF link annotation
    • http://fresh-j.info/images/uploadedimages/file/migumuvubig.pdfIn PDF document text
    • https://organicfertilizerproduction.com/d/files/rowejibegedabugumofiv.pdfIn PDF document text
    • https://nceptionsolutions.com/wp-content/plugins/super-forms/uploads/php/files/a323df2e744ba81b2dd9eb3661718dbc/36933975535.pdfIn PDF document text
    • http://mnogonomerov.ru/uploads/file/tuvojagogedajakejoda.pdfIn PDF document text
    • https://www.euroservicemilano.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a7cc00769d2---87650462125.pdfIn PDF document text
    • https://www.budgetskemaet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1609f2db34c809---3685485757.pdfIn PDF document text
    • https://willmarlakesarea2040.com/ckfinder/userfiles/files/28924903473.pdfIn PDF document text
    • https://hcs1000.org/wp-content/plugins/super-forms/uploads/php/files/0d1653cb324319790b7daf1719cd256f/nuvurinojotixuwuvusifefe.pdfIn PDF document text
    • http://rakkhunnursinghome.com/user_img/files/juzagadarori.pdfIn PDF document text
    • https://www.sacproblemleri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aafbe7eac1a---nekuvomasevubulelifusu.pdfIn PDF document text
    • http://videofilm-tv.ru/content/File/52052363513.pdfIn PDF document text
    • http://violetstudio.in/userfiles/file/guxaxisezite.pdfIn PDF document text
    • http://abacusnancy.com/userfiles/file/nivigudemarom.pdfIn PDF document text
    • https://foulardfotografando.it/file/86041915498.pdfIn PDF document text
    • https://www.frankreich-ferien.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1609d1adf1051c---wumasukikururinetokevoli.pdfIn PDF document text
    • https://myclubowners.com/userfiles/files/11740232757.pdfIn PDF document text
    • http://www.holzbau-hoelzl.at/wp-content/plugins/formcraft/file-upload/server/content/files/160a8a6c39dd6d---kipusa.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_off0000e5e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5E9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fdfb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDFB 18192 bytes
SHA-256: 62633a69eee4754b55be655034068fa0d1c6c588c3bb24801cfdeb4084c66d48
font_02_sfnt_off00012cb6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CB6 11556 bytes
SHA-256: 0b8b980ac3d615f9bad9e2ee975754d30172f02369ca3964ff1205b5f148f9bd