Malicious PDF — malware analysis report

Static analysis result for SHA-256 2da15168f1634d03…

MALICIOUS

PDF

77.6 KB Created: 2021-09-19 04:02:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 9796cf64763a739beeafdddb2267ed26 SHA-1: 4609c52573b6f2fbda09b2656c7a675ef34ed4eb SHA-256: 2da15168f1634d0354267e1fa0d1102bd48a1fd12e3618277d4ce9bbadbf4ecb
164 Risk Score

Malware Insights

MITRE ATT&CK
T1059.007 JavaScript T1566.001 Spearphishing Attachment

The sample is a malicious PDF containing embedded JavaScript, which is a common technique for executing malicious code. It also features a link farm pointing to multiple compromised websites, likely intended to host phishing pages or download further malware. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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
  • 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://pixomot.ru/uplcv?utm_term=totok+messenger+app
    • https://study-go.info/wp-content/plugins/super-forms/uploads/php/files/ad9aa5d3174e26b21517d20b542c5e16/tajizijufu.pdf
    • http://spzpoz-zdunskawola.pl/upload/file/57010142198.pdf
    • http://dsagco.com/Upload/file/nisemagifesozoxadi.pdf
    • http://www.sport-konyv.hu/userfiles/file/18477037233.pdf
    • http://52963566.com/upload/file/202109161210574149.pdf
    • https://iohrp.org/f_files/files/duvurudulapolofi.pdf
    • https://elemental-ia.com/userfiles/file/61094482338.pdf
    • http://alessandrobelleseveterinario.eu/userfiles/files/dofod.pdf
    • http://reutlinger.pl/userfiles/file/78813516812.pdf
    • http://halvani.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ec088c441b---79404271168.pdf
    • https://www.grecosalesinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c89c9581f0---tubajemojejumamuz.pdf
    • http://duancanhotot.com/upload/files/nulalili.pdf
    • https://edex.co/userfiles/files/64362367578.pdf
    • http://www.linkkorea.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/16130dd25cbc86---99002201881.pdf
    • https://sitycare.com/FCK-UserFiles/files/tutapejugavamaniperevuke.pdf
    • http://www.whirlpool-beachcomber.at/wp-content/plugins/formcraft/file-upload/server/content/files/16145ae08c57a9---tupetalimurekutenorum.pdf
    • https://borderpak.com/wp-content/plugins/super-forms/uploads/php/files/b3cc04c34539bb3f961bad5a2ba1dcb8/wukibel.pdf
    • http://songhandiban.com/uploadfile/file/2021091515201073499.pdf
    • https://binarbaidtrading.com/public_html/userfiles/file/91692479123.pdf
    • http://clarksville.net/wysiwygfiles/file/logodiwamufigazesukin.pdf
    • http://senvietsystem.com/ckeditor/upload/files/vakimunenalufososek.pdf
    • http://tomekorea.com/userData/board/file/94916885106.pdf
    • http://nattuvaartha.com/assets/ckfinder/core/connector/php/uploads/files/piruzofaluvin.pdf
    • http://portofmiamitunnel.com/system/js/back/ckfinder/userfiles/files/nibegef.pdf
    • 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_off0000cddf.bin
c7ae94d47efcd6883bdedda4380a3bdf77af2e92e2032ad2fd43abfca37b5d21
pdf-font-stream PDF embedded font (sfnt) at offset 0xCDDF 10512 bytes
font_01_sfnt_off0000e5d9.bin
c34b327c3825f557905b7efc0c0615823e94400f4be703026524945991e1e687
pdf-font-stream PDF embedded font (sfnt) at offset 0xE5D9 16688 bytes
font_02_sfnt_off000110d8.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x110D8 16792 bytes