Malicious PDF — malware analysis report

Static analysis result for SHA-256 9793c209acaa141a…

MALICIOUS

PDF

91.3 KB Created: 2021-07-23 04:21:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 4928c9f9c4fab324585cd279469a8a73 SHA-1: d218cdfd67f8ea7f9a885c2d4789f893fe0ab6c7 SHA-256: 9793c209acaa141a7256f24ffbe1c072097f1cddbd03ef52b4bf7112bca9c61f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The file contains a link farm pointing to compromised WordPress upload storage and other disposable hosting, suggesting an attempt to redirect users to malicious sites. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a phishing or malware distribution lure, likely leveraging spearphishing attachment as the initial access vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://mymovingestimate.com/wp-content/plugins/super-forms/uploads/php/files/5d1a377312cd51941fbc494c05a8ae2b/tejisolebugijutadegetuluw.pdf In PDF document text
    • http://www.jimenez-casquet.com/wp-content/plugins/formcraft/file-upload/server/content/files/160acaa559874d---63323146316.pdfIn PDF document text
    • http://yaqeen-eg.com/userfiles/file/16492853788.pdfIn PDF document text
    • http://kondicionery-krasnogorsk.ru/upload_picture/file/polusunivivodisexato.pdfIn PDF document text
    • https://connect.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/78c8b439e7d940bbfdbdbd9f1860ff32/50315152751.pdfIn PDF document text
    • https://nobleanimalsanctuary.org/wp-content/plugins/super-forms/uploads/php/files/tmp/paxulunafuf.pdfIn PDF document text
    • http://clinicoral.com/img/userfiles/files/35901553219.pdfIn PDF document text
    • http://eksan-ltd.com/userfiles/file/36196184524.pdfIn PDF document text
    • https://luxmarketing.agency/wp-content/plugins/super-forms/uploads/php/files/usndmm55umrs31u7sb4ja6sm2t/98882726951.pdfIn PDF document text
    • https://equator-maritime.com/userfiles/file/zokeduduwatutof.pdfIn PDF document text
    • http://dh-cell.net/ckfinder/userfiles/files/xikozosowimudodex.pdfIn PDF document text
    • http://www.uppld.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609a1df416c37---73696212561.pdfIn PDF document text
    • http://ristoranteyuri2.com/userfiles/file/xadazulajefutisoje.pdfIn PDF document text
    • http://shinies.ru/img/lib/file/gijonesetiwilorotutuw.pdfIn PDF document text
    • https://hse.tw/upload/file/roxazasadixukesedigojew.pdfIn PDF document text
    • http://anhuizhkj.com/upload_fck/file/2021-5-8/20210508051252846975.pdfIn PDF document text
    • https://refundsrefunds.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c635fe13285---damidelizuzukokugu.pdfIn PDF document text
    • http://www.fullmooneye.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bfb7d2b2677---47844551130.pdfIn PDF document text
    • https://299-45.com/CKEdit/upload/files/79738199576.pdfIn PDF document text
    • https://anthonygillant.com/userfiles/file/99053962349.pdfIn PDF document text
    • https://livingcircles.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160abccb4dd564---vexavuzozosiserenubu.pdfIn PDF document text
    • https://adepotcustom.com/UploadFiles/file/20210428135309163.pdfIn PDF document text
    • https://hotelritariccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/160c03f4eee1ab---14303650968.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=introduction+to+environmental+science+pptPDF 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_off0000fdee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDEE 18424 bytes
SHA-256: fd910ec3a86f9c31393d692bac788253d7a5cbdcc61b00a91206815570ec4d46
font_01_sfnt_off00012e1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E1D 10792 bytes
SHA-256: 705cbc430b47a0ae81d325218cb247c8c371db3b0072692b0d051cfe8622b823
font_02_sfnt_off000146ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x146FF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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