Malicious PDF — malware analysis report

Static analysis result for SHA-256 491d97e286c17335…

MALICIOUS

PDF

90.4 KB Created: 2021-08-16 06:36:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: aef3f7e929644e41e0fca57306ccfa86 SHA-1: af5096cd898e4369bccfa17ba730414dd0224b28 SHA-256: 491d97e286c17335c9ca13bc92a54e1b9b2843b7067d21e4fe51ba56042fb82b
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to potentially compromised websites and disposable hosting, indicative of a link farm used for phishing or malware distribution. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to a phishing campaign or a trojan downloader. No scripts were extracted, but the structure and URL patterns are highly suspicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9946

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://swagath.co/new/ckfinder/userfiles/files/dixofaziguxesorisafeluvep.pdf In PDF document text
    • https://ctsgroups.asia/images/file/vanosevutoveferu.pdfIn PDF document text
    • http://picassogift.com/Uploadfiles/files/24738754286.pdfIn PDF document text
    • http://deurwater.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608871aeb26f6---77254834628.pdfIn PDF document text
    • http://ajtoablakcentrum.com/_user/file/kunitoromi.pdfIn PDF document text
    • http://ridendo.cz/files/file/40305168427.pdfIn PDF document text
    • https://www.numberoneporthill.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1611446688cec4---10436024673.pdfIn PDF document text
    • http://dabien.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/160826d256c603---bowuvejarumapo.pdfIn PDF document text
    • https://www.idahomedia.com/wp-content/plugins/super-forms/uploads/php/files/f6c9027cf30445e499295f6d5277ee93/rumesokezurepik.pdfIn PDF document text
    • http://bakerfamreunion.com/clients/1/13/13be4b03bdabdd3a133c3ee64ed6201b/File/buwisidipunavabatowib.pdfIn PDF document text
    • http://fotofolliasanlazzaro.it/userfiles/files/xinodorufavufagudonu.pdfIn PDF document text
    • https://wscnaturalhealings.com/wp-content/plugins/super-forms/uploads/php/files/9b9fe2b0b2ca00997ba57101f03580a6/8567038164.pdfIn PDF document text
    • http://vitalchurchesinstitute.com/files/file/81342865550.pdfIn PDF document text
    • http://dwallacelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/birijufa.pdfIn PDF document text
    • http://brandnewgoods.net/userfiles/file/fexatuwoneborubebuf.pdfIn PDF document text
    • http://okeefesreef.com/ckfinder/userfiles/files/xaxunozulebesulovi.pdfIn PDF document text
    • https://louvre.lv/res/wysiwyg/file/62461250493.pdfIn PDF document text
    • https://cedarcreeksauce.com/wp-content/plugins/super-forms/uploads/php/files/546e402da033985f3bd8805af651dcfc/32913992338.pdfIn PDF document text
    • http://daedukgs.com/admin/fckeditor/data/file/20210601100033.pdfIn PDF document text
    • http://aven.su/userfiles/file/21853478899.pdfIn PDF document text
    • http://kpotplace.com/uploads/files/28195389391.pdfIn PDF document text
    • https://nolimitscenter.be/peausitive/images/FCKeditor/file/zekosotenexafufamip.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=copperplate+calligraphy+pdf+free+downloadPDF link annotation
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e66d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE66D 16524 bytes
SHA-256: cf0dadd9035975c290c11a027bd8f5e0fc83f98d1f21a4a4f59dd027dbd4cdfc
font_01_sfnt_off0000fd37.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD37 10960 bytes
SHA-256: 1de0f615ce9dafc99d79fccee9ff5c550b275ed149da9c817b6dbc3d5feb6dcd
font_02_sfnt_off00011676.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11676 17320 bytes
SHA-256: 674c82dab7ec0300b077378a93f44a56fe19dc957cc33b1ed7ea0db161f4aa4f
font_03_sfnt_off000143d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x143D6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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