Malicious PDF — malware analysis report

Static analysis result for SHA-256 d82ff151fbb3ce98…

MALICIOUS

PDF

74.8 KB Created: 2021-09-05 07:34:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: c2fbd9a391eac3e2d908afa38bd1f373 SHA-1: 215e4a74cd0568c4cfb7f8d44c536cbc02df1e99 SHA-256: d82ff151fbb3ce988d5438e25e3b1075f5dc2fea8b62ef0f00e559ce1c6c9cdc
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many hosted on disposable domains or compromised WordPress sites, suggesting a link farm designed to lead users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware delivery. The presence of external URIs and link farm heuristics points towards an attempt to exploit users via external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 https://cructi.ru/uplcv?utm_term=ccnp+r%26s+syllabus+pdf PDF link annotation
    • http://rudolphi.nu/userfiles/file/49971481062.pdfIn PDF document text
    • http://ukrainski-rosyjski.pl/userfiles/file/nadigipibex.pdfIn PDF document text
    • http://materialdeestudo.top/userfiles/files/wexopoduxosaziz.pdfIn PDF document text
    • http://ibrahimalsada.com/pics/file/38224409044.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/vn29utff8adbqgjmpclfqkvqq4/83582571119.pdfIn PDF document text
    • http://amandatravel.com/userfiles/file/xirevuwozarodejiwijezibu.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ccd272ae01.pdfIn PDF document text
    • http://infrabud.eu/fckpliki/file/7387861574.pdfIn PDF document text
    • http://elmiraclassiccountry.com/wp-content/plugins/super-forms/uploads/php/files/13a82ad1f59e17355386cd2f2be55480/51082128039.pdfIn PDF document text
    • http://palami.by/images/file/85574168695.pdfIn PDF document text
    • https://atl-50.com/files/file/werazurotezowerivizivejo.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/1c5aa8f2001db76ba76dcfecbfe952c3/viralisiteranurefosuk.pdfIn PDF document text
    • http://proxima-design.cz/files/file/8783823320.pdfIn PDF document text
    • http://dmn.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1609060d3ee014---59767437733.pdfIn PDF document text
    • http://restokrat.info/userfiles/file/pafoleparol.pdfIn PDF document text
    • http://vote4dannybarry.com/clients/2/2f/2f5d4f67c16906f9b09010289963de11/File/655738653.pdfIn PDF document text
    • http://tiszaladany.hu/upload/file/52395761837.pdfIn PDF document text
    • http://abwjefferson.com/uploads/files/kitasazupumomo.pdfIn PDF document text
    • http://basyapiemlak.com/yukleme_klasoru/userfiles/file/torekobetaworenevep.pdfIn PDF document text
    • http://aqbnb.com/uploadfile/file/85478332640.pdfIn PDF document text
    • http://compsult.net/userfiles/file/peliferojojivuwariwetig.pdfIn PDF document text
    • https://sirikulsteel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081e1dcef0ae---480384134.pdfIn PDF document text
    • http://southwest66reunion.com/clients/f/f6/f6f8b7bd17d60304c359e527a2c43449/File/61478479197.pdfIn PDF document text
    • http://timatey.kz/wp-content/plugins/super-forms/uploads/php/files/gpnucj46cc14dnos8ujveal1h5/25356482346.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_off0000c4c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC4C0 9580 bytes
SHA-256: a0b450afe03839d524bd68d763e9961e7a0b1573acac67ff2ca7ade0e1ab2c64
font_01_sfnt_off0000d973.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD973 17672 bytes
SHA-256: 80123b8101c5e0d6b796371b780f37f6d73c152e7626ace07f7fc798277eee5e
font_02_sfnt_off00010640.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10640 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1