Malicious PDF — malware analysis report

Static analysis result for SHA-256 49e8f411a51287bb…

MALICIOUS

PDF

91.8 KB Created: 2021-06-26 08:57:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 5a9a3060d5562e82564c02e05a67caf4 SHA-1: 470e41cc15dfc4295b784024ddfc7e8ecf9c7c10 SHA-256: 49e8f411a51287bb10d432ff5fe6a8ac9be09212af77ac635c0e1ac6e5804117
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to compromised WordPress sites and disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware delivery. No scripts were extracted, but the structure and URL patterns are indicative of a common PDF-based lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9937

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://wamsconference.com/wp-content/plugins/super-forms/uploads/php/files/d9baf67ad7dcad1cda71f8a86011dfc3/12389053045.pdf
    • http://barudan.hk/UploadFile/file/20210610224909343.pdf
    • https://teenvolunteerdallas.org/wp-content/plugins/super-forms/uploads/php/files/b98962eb411fcec355934df0908bef2f/xatiluxugokobadafareb.pdf
    • http://chinhlytailieuluutru.com/media/ftp/file/sipumupupadupegiku.pdf
    • http://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/tm60knuanbi489250n13b49tb6/reruwenaki.pdf
    • http://varanini.pl/userfiles/file/wirutebujow.pdf
    • http://ck-kutnahora.cz/gais/image/file/61447480615.pdf
    • https://sg-design.top/wp-content/plugins/super-forms/uploads/php/files/84c9814480203c78510ae6d4ae8ee553/dajudoxewete.pdf
    • https://www.drserapkagan.com/wp-content/plugins/super-forms/uploads/php/files/v4iaeeqrft9sglf2sq51pb5hfk/zijefuwamanam.pdf
    • https://www.hdcorp.com.br/wp-content/plugins/super-forms/uploads/php/files/4u2h43sm52u4l6rj2m829anc15/rowakiditadununosazuxo.pdf
    • http://shinies.ru/img/lib/file/65486029586.pdf
    • https://www.cir.cloud/wp-content/plugins/formcraft/file-upload/server/content/files/1606ee2eb0fea6---87179782051.pdf
    • https://moto-trend.cz/public/files/fck/file/xiper.pdf
    • https://auf.vn/wp-content/plugins/super-forms/uploads/php/files/bjjgq3celkssnd9o4snic1afn4/29738307596.pdf
    • http://grupomarsamo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d55a686a57---kulikalikovemobojaxunonoz.pdf
    • https://www.conkite.com/wp-content/plugins/super-forms/uploads/php/files/515cc3e391b2db3591f0e2cb844c2323/sivusafan.pdf
    • https://budapestpainter.hu/ckfinder/userfiles/files/nanuj.pdf
    • https://www.lumisolar.pe/wp-content/plugins/formcraft/file-upload/server/content/files/160785a6a5ef36---nokamobaja.pdf
    • https://criteriacambio.com.br/wp-content/plugins/super-forms/uploads/php/files/5t76hf0kbodi43vpkf6ojr2qlo/98125223474.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607dcc144b5d4---14666057293.pdf
    • https://www.euroservicemilano.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607f6b6e45bec---suluraredesujopajusida.pdf
    • https://simon-daulte.com/ckfinder/userfiles/files/figuguvafafuxot.pdf
    • http://brodart01.com/wp-content/plugins/super-forms/uploads/php/files/cgb9oeed4cmvckflce2p97244i/70572131984.pdf
    • http://www.louthadventures.ie/wp-content/plugins/formcraft/file-upload/server/content/files/160be641a95286---magulezipoxafenelu.pdf
    • https://mandalaconfeccao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607a5c2e29257---vorofil.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=at+someone%27s+beck+and+call
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010384.bin
c2cc083b65036c36d58457cd1b4249f4a2027caa85d1ef9e01221fdb045987d7
pdf-font-stream PDF embedded font (sfnt) at offset 0x10384 10588 bytes
font_01_sfnt_off00011bd1.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11BD1 16792 bytes
font_02_sfnt_off000133e3.bin
47fc61597f0212ecc9b900e09da1f6fc9e42b39ef5b5f87791622159ac5eb09f
pdf-font-stream PDF embedded font (sfnt) at offset 0x133E3 17736 bytes