Malicious PDF — malware analysis report

Static analysis result for SHA-256 703dd0930007c7fc…

MALICIOUS

PDF

81.3 KB Created: 2021-08-28 16:37:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: a70b7d73be2eb1d01be3feaf9b6c3900 SHA-1: b697735c96119a61f855ea7b7a61365678146b92 SHA-256: 703dd0930007c7fc7f0062360f2cb9febda4ac377d06aa09a93c562b46233c79
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It functions as a link farm, containing numerous URLs pointing to compromised CMS uploads and disposable hosting, likely intended to redirect users to malicious content or phishing sites. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, offering no direct user-facing content but serving as a container for the malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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://avenirpourtous.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160aa1793a7384---47283413894.pdf In PDF document text
    • https://arvikabc.com/images/uploadedimages/file/nizuzosutav.pdfIn PDF document text
    • http://kingalbertltd.com/uploadedfiles/file/67412241694.pdfIn PDF document text
    • https://gresathouse.com/wp-content/plugins/super-forms/uploads/php/files/db0144a3142220ff88b7e432fe47a1b4/16377419633.pdfIn PDF document text
    • https://www.natursany.com//ckfinder/userfiles/files/joruwibadowotufubelexur.pdfIn PDF document text
    • https://langumeistras.lt/i/File/kazobaro.pdfIn PDF document text
    • http://autosklo.sk/pictures/file/zexivi.pdfIn PDF document text
    • https://advancedbusiness.co/wp-content/plugins/super-forms/uploads/php/files/11a874d2f44fc75c8e744ec4d3269099/sagedife.pdfIn PDF document text
    • http://bavlas.lt/ckfinder/userfiles/files/14001478022.pdfIn PDF document text
    • http://innotack.com/userfiles/files/sopinajenenugozuti.pdfIn PDF document text
    • http://bwc.lt/i/bivatimipufurivibivik.pdfIn PDF document text
    • http://sammyuriasproperties.com/userfiles/files/nebokalunewawu.pdfIn PDF document text
    • https://takiminsahada.com/wp-content/plugins/super-forms/uploads/php/files/ce4nel1pel9873dibrg336rilb/57781025405.pdfIn PDF document text
    • http://gatewayhotelbangkok.com/upfile_hotel/files/12119619363.pdfIn PDF document text
    • http://discoveryenglish.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608c0706a65b2---22529763777.pdfIn PDF document text
    • https://www.advids.io/wp-content/plugins/formcraft/file-upload/server/content/files/160b99bcf863da---gigekofu.pdfIn PDF document text
    • http://www.insurancedirectcanada.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160a3d276294d7---regegifumajima.pdfIn PDF document text
    • https://agrilaui.com/userfiles/file/vitedu.pdfIn PDF document text
    • https://aeap.com.br/ckfinder/userfiles/files/doxidazowajamow.pdfIn PDF document text
    • http://bellezaeimagen.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160cf61e7353de---lukagupasukevibom.pdfIn PDF document text
    • http://duancanhotot.com/upload/files/diraxoje.pdfIn PDF document text
    • http://biotop-zamosc.pl/userfiles/file/bazuwabidujeruwixuje.pdfIn PDF document text
    • http://bularz-auto.pl/images/userfiles/file/nopotug.pdfIn PDF document text
    • https://www.budgetskemaet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1608ab2e6a170f---60239600718.pdfIn PDF document text
    • https://www.parkgest.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160ad47bfbd652---xuzosuzapamejotibu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=names+of+covalent+compounds+listPDF 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d73c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD73C 18156 bytes
SHA-256: 1b3c2b9967bd17ecf781810f522f40cbe124e4618eb5cd2bda2c8d627f7b407d
font_01_sfnt_off000105d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105D6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011ded.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DED 10824 bytes
SHA-256: 432513755cf085a0fab2f8623f35f43b2492403b28701b2ec805dbe773ac3a92

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