Malicious PDF — malware analysis report

Static analysis result for SHA-256 d8be8236281399eb…

MALICIOUS

PDF

81.9 KB Created: 2021-09-14 08:49:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 41641a53db9a658c1230028fed848238 SHA-1: 192260903fe4a70bfce7329274ddfcc66948cde6 SHA-256: d8be8236281399ebe070b9d710c38845652968e79fe7b0f53f617f13a935fe6b
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and numerous external URIs, many of which point to compromised CMS upload directories or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution through these links. The presence of embedded JavaScript suggests potential for further malicious actions beyond simple redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://wastran.ru/uplcv?utm_term=recycler+list+view PDF link annotation
    • https://khanoomhoteli.com/basefile/khanoomhotelicom/files/tupasoj.pdfIn PDF document text
    • http://hadt.vn/upload/files/sezewafivi.pdfIn PDF document text
    • http://www.immiflex.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132d0402204f---34315479648.pdfIn PDF document text
    • https://yuktiedu.com/wp-content/plugins/super-forms/uploads/php/files/e7b64e302522095268aa795130667589/tijizigikomifejuj.pdfIn PDF document text
    • http://chatyzvule.cz/uploads/15729247935.pdfIn PDF document text
    • http://terredellamagnagrecia.com/userfiles/files/fexozelopax.pdfIn PDF document text
    • http://ozdesignhouse.com/app/webroot/uploads/files/57475029077.pdfIn PDF document text
    • https://asiapharma.la/files/files/nidusokugezi.pdfIn PDF document text
    • https://crcnueva.naturasoftware.com/uploads/images/files/44970758482.pdfIn PDF document text
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138deb51ee90---fizevilunudodusude.pdfIn PDF document text
    • https://ltssinternational.com/res/wysiwyg/file/potukaruzo.pdfIn PDF document text
    • http://mxagproducts.com/upload/browse/file/85103323750.pdfIn PDF document text
    • http://garageanything.com/js/upload/files/27144598662.pdfIn PDF document text
    • http://cableesmaltado.com/d/files/kotudekoxawimaxorif.pdfIn PDF document text
    • http://ozdoby-betonowe21.pl/Upload/file/29648807645.pdfIn PDF document text
    • https://thegioidongphuc.net/ckfinder/userfiles/files/66643130431.pdfIn PDF document text
    • http://bluebossa.pl/files/file/sawusijojozajogunopixoj.pdfIn PDF document text
    • http://mlsy.cz/images/file/files/vunaniguzabejemojiwo.pdfIn PDF document text
    • http://lifecare4all.com/upload/files/femowuwabutebibaxalikafip.pdfIn PDF document text
    • https://infypos.com/infyposcms/media/59220260443.pdfIn PDF document text
    • http://asbu.net/uploads/FCK_files/file/99161529092.pdfIn PDF document text
    • https://gulfb2b.com/userfiles/file/67701270790.pdfIn PDF document text
    • https://imotrading.com/images/userfiles/mojewi.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_off0000ddc0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDC0 10148 bytes
SHA-256: b276e76122fc61144bef5c370dd6890b77428c645ce034f77b69517f05886eab
font_01_sfnt_off0000f498.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF498 17536 bytes
SHA-256: 76e4d1cd5ce8286f3c23f83c41a90d93f010a5d0dc3ea84092e10416dd07ab3d
font_02_sfnt_off000121dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121DD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1