Malicious PDF — malware analysis report

Static analysis result for SHA-256 0260ceb38fa4de60…

MALICIOUS

PDF

96.7 KB Created: 2021-08-24 20:15:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: f236a597fa1131df560439b4fcadb965 SHA-1: 83e96c89d013be7f99df4a7b3846a082f49ddb59 SHA-256: 0260ceb38fa4de60c10316c97867b88abd6631201dbebb6033754719b914e769
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed for SEO manipulation or to distribute further malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9894

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 http://accronline.com/userfiles/file/22911938693.pdf In PDF document text
    • https://gikguamerica.com/userfiles/file/98987444869.pdfIn PDF document text
    • https://www.etbsupplies.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608409803c8eb---69714989126.pdfIn PDF document text
    • http://0vote.com/ckfinder/files/33365507285.pdfIn PDF document text
    • http://www.a-fairys-choice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bc54324873---kimikad.pdfIn PDF document text
    • https://memoservicesrl.it/file/wosapoj.pdfIn PDF document text
    • http://global-gypsum.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fb2b830a574---4415796169.pdfIn PDF document text
    • https://study-abroad-travel.com/ckfinder/userfiles/file/35693665519.pdfIn PDF document text
    • https://bd-sokolovska.eu/userfiles/file/94330806514.pdfIn PDF document text
    • http://alvitraders.com/files/fexozixele.pdfIn PDF document text
    • http://dansensvenner.dk/imagesfile///35324533818.pdfIn PDF document text
    • http://www.norestim.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160a7dce47afad---6889458608.pdfIn PDF document text
    • http://www.reroofingbrisbaneqld.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1606f3acc1d70c---14893923084.pdfIn PDF document text
    • http://jgbt.us/pds/userfiles/files/1275220476.pdfIn PDF document text
    • http://vincityhomes.vn/wp-content/plugins/super-forms/uploads/php/files/4u04tnjmj847t8b4i1qo8jh1l7/bexux.pdfIn PDF document text
    • https://medsplus.us/admin/images/file/82873163085.pdfIn PDF document text
    • http://timavoshipsupply.it/userfiles/file/gajalegejuzazanojomevo.pdfIn PDF document text
    • http://klick-tipp.info/ckfinder/userfiles/publics/files/genowebowegovojonimet.pdfIn PDF document text
    • https://thejinglelab.com/wp-content/plugins/super-forms/uploads/php/files/7pt0jbcf3a5krb0srneuo4kg3d/sofuxoxilibagazidulop.pdfIn PDF document text
    • https://africanresearchcenter.com/userfiles/file/ginopipemudikirebosu.pdfIn PDF document text
    • https://bhiringisamsankalimandir.org/ckfinder/userfiles/files/49149364515.pdfIn PDF document text
    • http://xn--9w3b11kh5l.com/ckupload/files/31662675882.pdfIn PDF document text
    • http://angarakshaksecurity.com/userfiles/file/mutovikomukoxobovopido.pdfIn PDF document text
    • https://xosobacninh.vn/webroot/img/files/25989221164.pdfIn PDF document text
    • http://grandinhr.eu/images/user/file/57945034236.pdfIn PDF document text
    • http://brandiassociati.it/userfiles/file/21044630616.pdfIn PDF document text
    • http://kiuanai.com/userfiles/file/bosozulemis.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=polynomial+sums+for+class+9PDF 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_off0000ff26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF26 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001173d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1173D 10652 bytes
SHA-256: c950b78e2a8f61261b710bb83c5fea705f3621e600ced5d6c1e1ae183b682f9c
font_02_sfnt_off00012fab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12FAB 17684 bytes
SHA-256: 7b19432b2e02681d4fe10a741ef6f770e00bf970c1bb279db3fd5687d4b82b5a
font_03_sfnt_off00015e8e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15E8E 16224 bytes
SHA-256: da79484a7f94e028a8871d907a282bdc2df095dfef79f7b1f2af1efeeab75da7