Malicious PDF — malware analysis report

Static analysis result for SHA-256 aa16d328e2ad7e02…

MALICIOUS

PDF

91.5 KB Created: 2021-08-02 03:26:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: d06aab4f2f12c83903e33bc913080dcc SHA-1: 4a90e6aaa35fc0175aa93d916256efae63bd154d SHA-256: aa16d328e2ad7e02933f6a250643c492f3d8c6b13c67b435a21e9242a269906d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to multiple PDF files hosted on compromised WordPress sites, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were directly extracted, the presence of external links and the nature of the heuristics point towards a phishing lure designed to trick users into downloading software or visiting malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9932

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://www.baust.edu.bd/app/webroot/ckfinder/userfiles/files/tofufatemamoxubofamajoz.pdf In PDF document text
    • https://massagetheory.ca/wp-content/plugins/super-forms/uploads/php/files/8869493083b788dc275fe67aeef797ae/vuwuzifetadelovikoxadanes.pdfIn PDF document text
    • http://abwfinlay.com/uploads/files/9530670163.pdfIn PDF document text
    • https://yastudio.net/wp-content/plugins/super-forms/uploads/php/files/3736efc5ebcde4a2c8ab50e3661c4a16/34014126993.pdfIn PDF document text
    • https://cuatudongbinhduong.net/uploads/files/xedagazokudikagopera.pdfIn PDF document text
    • https://istanajp2.com/contents//files/tojana.pdfIn PDF document text
    • https://jetzterstrecht.hamburg/wp-content/plugins/super-forms/uploads/php/files/p6k34jvnv1lhiqip1ms0rchj0g/xobifukisasajediv.pdfIn PDF document text
    • https://www.cdscabling.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b591ad0cf11---dukusufoganajuzapojutava.pdfIn PDF document text
    • http://atut-biuro.com/uploaded/file/gexaboborepomakorakixi.pdfIn PDF document text
    • https://raljob.com/userfiles/file/sesigokor.pdfIn PDF document text
    • http://amtusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/161034ee309686---62276766283.pdfIn PDF document text
    • https://ddshower.com/ckfinder/userfiles/files/popatipem.pdfIn PDF document text
    • http://toyotarent.hk/FileData/ckfinder/files/20210709_3BA992D23E174F98.pdfIn PDF document text
    • https://www.couleurs-et-jardin.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160edd688ccf0a---xesikogufixavarijesa.pdfIn PDF document text
    • http://irmascaritasdejesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/16087ec8f77a0a---xetubipaxereg.pdfIn PDF document text
    • http://chnli.tw/CKEdit/upload/files/44037126348.pdfIn PDF document text
    • http://www.colegiometa.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/1609426cf4e0ff---nufinebatelajanivovenoz.pdfIn PDF document text
    • https://atlaskvartir.ua/data/uploads/files/62527351890.pdfIn PDF document text
    • https://www.coconutlodge.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b3389bfbfa---rawonubikogedodevos.pdfIn PDF document text
    • http://elencostruzioni.it/userfiles/files/45481257895.pdfIn PDF document text
    • http://www.grupohk.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160abdce8aada4---99480144930.pdfIn PDF document text
    • https://fasaac.org/temp//files/lumumidepav.pdfIn PDF document text
    • http://au-coeur-du-temps.com/userfiles/file/41756504881.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=descargar+nitro+pro+10+gratis+en+espa%C3%B1ol+64+bits+con+crackPDF 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_off0000edd1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDD1 11408 bytes
SHA-256: f5e00dd2ba656c4993d4964021aadc6dc3600fa9087dd6ea8e3a03705414e244
font_01_sfnt_off00010878.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10878 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001208a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1208A 18520 bytes
SHA-256: 620ef1addf015c85a6b6678e67a6fc53f970c7c3f6ab701944b988e816d7d770
font_03_sfnt_off00015066.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15066 3156 bytes
SHA-256: 456373d1bf10da85a32584705f749a1957707b16b326f533c152f429fe9f9b26

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