Malicious PDF — malware analysis report

Static analysis result for SHA-256 d7d9b7ed4956ca92…

MALICIOUS

PDF

81.9 KB Created: 2021-09-05 01:22:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 838bb7d84d58cf7ba5be81b702057fdf SHA-1: 7ee2e7c1786eba758526713fdb23e54dc2746541 SHA-256: d7d9b7ed4956ca92ae219c7ca93f19171a5f60cc4757394e2b12bfd787291f05
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. It functions as a link farm, directing users to numerous external URLs, several of which are hosted on compromised WordPress sites. The presence of these links suggests an intent to lead users to phishing pages or download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://chcial.ru/uplcv?utm_term=english+grammar+question+paper+for+class+3+pdf PDF link annotation
    • http://greenbiotech.vn/uploads/userfiles/file/68779005366.pdfIn PDF document text
    • http://birzebbugastpetersfc.com/files/file/vekejofebixu.pdfIn PDF document text
    • https://cosalesrep.com/wp-content/plugins/super-forms/uploads/php/files/fd35006d67c342a44b42870864008d3f/34792535726.pdfIn PDF document text
    • https://perleyparish.org/wp-content/plugins/super-forms/uploads/php/files/4ec745405273433788df60962eb2576f/49624776707.pdfIn PDF document text
    • http://ng-sons.com/userfiles/file/gajowimipumofo.pdfIn PDF document text
    • http://rivebistro.net/ckfinder/userfiles/files/75513809135.pdfIn PDF document text
    • http://paintingservicesonline.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160b6590441461---nuroxale.pdfIn PDF document text
    • http://polishingmarblefloor.it/userfiles/files/26737415640.pdfIn PDF document text
    • http://aliceinformaticasrl.com/user/pages/95806126726.pdfIn PDF document text
    • https://albizy.com/ckfinder/userfiles/files/jadurorafuj.pdfIn PDF document text
    • http://soul-program.com/clients/e/e8/e84723a0d254fbc5507aaa4bd1967541/File/janadepaselal.pdfIn PDF document text
    • http://alibabashipping.com/userfiles/file/dazufitog.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f193cf38a6---timip.pdfIn PDF document text
    • http://alarcon-v.com/editor_upload_image/file/dogijiwodorivunisa.pdfIn PDF document text
    • http://jsushibrea.com/uploads/files/danozomaditarikiwovuf.pdfIn PDF document text
    • http://diegogenna.it/userfiles/files/xizosokitimemitunanad.pdfIn PDF document text
    • http://giftboxvietthuy.com/upload/ck/files/34030480357.pdfIn PDF document text
    • http://aktifimmo.lu/userfiles/files/badam.pdfIn PDF document text
    • https://magiccat.pro/ckfinder/userfiles/files/xuwek.pdfIn PDF document text
    • http://veraschwemmle.de/fckdata/file/vowogizudobotumabogojotu.pdfIn PDF document text
    • http://atenngo.com/admin/sites/site/documents/zijewub.pdfIn PDF document text
    • http://ahcxdq.com/uploads/file/271705048050.pdfIn PDF document text
    • http://anonelectronics.com/admin/fckeditor/editor/filemanager/connectors/php/upload_jpg/file/202105201842151310.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_off0000d931.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD931 11468 bytes
SHA-256: ba255dd5810c6f84a4c686777b9745a0916d280c45123f95a68884b1d9c6ac34
font_01_sfnt_off0000f38d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF38D 17804 bytes
SHA-256: ccf4fab0ad17e78906d9c678e64d2550f6d1ab80ff33b69c6e7589779f7bfe47
font_02_sfnt_off0001215f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1215F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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