Malicious PDF — malware analysis report

Static analysis result for SHA-256 e2db2b2a3ac665f8…

MALICIOUS

PDF

81.2 KB Created: 2021-09-18 03:48:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 2c5466215e4fef9ba69d12a0892676f9 SHA-1: 4a43260cbc6d68d484cacdc00df618a90eb99dd9 SHA-256: e2db2b2a3ac665f8d56849612997017ccf3f9a39cf5aa4a9362a24d3dd2cca54
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs pointing to compromised WordPress sites. These links appear to be part of a link farm designed to distribute malicious PDFs, as indicated by the 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' heuristics. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://synerhu.ru/uplcv?utm_term=wps+unlocker+premium+apk PDF link annotation
    • https://kantankacreative.com/wp-content/plugins/super-forms/uploads/php/files/16e6de5a5d7540561d48d3fe59d9a150/fodero.pdfIn PDF document text
    • http://classicalgardenornaments.com/uplds/file/molufowokazimaxeza.pdfIn PDF document text
    • https://karpataljaturizmus.hu/upload/lovivanisamixuxapige.pdfIn PDF document text
    • https://cvenhancer.com/wp-content/plugins/super-forms/uploads/php/files/a8c6c864cd55809db54cfdcaaff8c434/10570219603.pdfIn PDF document text
    • http://unitez.net/images/newtech/files/86302562899.pdfIn PDF document text
    • https://bnbcostaverde.it/userfiles/file/xekametigopebokexupuvatib.pdfIn PDF document text
    • https://oxi-dental.ro/imagini_ws/xatusebuxejava.pdfIn PDF document text
    • http://capitaldanceacademy.com/userfiles/files/rakuz.pdfIn PDF document text
    • http://lagunaapartman.hu/images/user/file/16839339265.pdfIn PDF document text
    • http://scandinavia-ex.com/images/blog/file/jinoxi.pdfIn PDF document text
    • http://ihdbd.org/upload/files/81839117075.pdfIn PDF document text
    • https://yuktiedu.com/wp-content/plugins/super-forms/uploads/php/files/64143242f508311ddcb2cb24631e25de/44554337501.pdfIn PDF document text
    • http://langmoon.jp/js/upload/files/gapevinuzixuxepiwu.pdfIn PDF document text
    • http://casaperugia.fr/userfiles/file/xuzuragefebuzafotoribog.pdfIn PDF document text
    • http://vpsystem.com/files/fck/didogunerajamedod.pdfIn PDF document text
    • http://www.mkkdigital.pt/wp-content/plugins/formcraft/file-upload/server/content/files/1613650614f9e3---bazakedox.pdfIn PDF document text
    • http://vibestedu.com/_UploadFile/Images/file/97992144074.pdfIn PDF document text
    • https://uzunlarpeynir.com/dursun/upload/files/xuwakukotosatedewivili.pdfIn PDF document text
    • http://fotocaroli.it/userfiles/files/84900039811.pdfIn PDF document text
    • http://liburnia.pl/userfiles/file/40841715152.pdfIn PDF document text
    • http://dieterheich.de/images/uploads/file/fodunifozifebivuwojuvela.pdfIn PDF document text
    • https://arch.ua/ckfinder/userfiles/files/xawaduvixemutivimigavegem.pdfIn PDF document text
    • https://mygamedaysports.com/wp-content/plugins/super-forms/uploads/php/files/8bdcac2cc7763a6b8b511bcf8608c067/gogezixab.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_off0000d708.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD708 18532 bytes
SHA-256: 1175fb1e65f2b2d4b526e42750fcd1b51f92b07ea83af67719bfbac6d77fc0e3
font_01_sfnt_off00010786.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10786 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011f9d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F9D 10624 bytes
SHA-256: b256758d7fdf3532452df3382b95029def0c5773b8812a8abd1aefb208bf0dac

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