Malicious PDF — malware analysis report

Static analysis result for SHA-256 63e1a9e47e392091…

MALICIOUS

PDF

83.4 KB Created: 2021-09-13 14:48:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 6bd0169807b1607a38dd6fc27837cc2f SHA-1: 47dbb56141bc2a60361555b477eb4a921bc0c02a SHA-256: 63e1a9e47e39209181906d801cffa5cae53494a4b0add7c9907d32fbe9182730
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to compromised websites, which in turn host other PDF files. This pattern suggests a phishing or malware distribution campaign. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or delivering a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://global-product.org/CKEdit/upload/files/waraxeju.pdf In PDF document text
    • https://www.revistadefiesta.com/wp-content/plugins/formcraft/file-upload/server/content/files/161321902987e3---82769065151.pdfIn PDF document text
    • http://qazaqbanki.kz/data/content/files/fukedusuwitupikakojem.pdfIn PDF document text
    • http://marjoleintje.nl/include/userfiles/68240326966.pdfIn PDF document text
    • http://tecsun-moscow.ru/docs/file/98248073511.pdfIn PDF document text
    • http://ramenhajimetustin.com/uploads/files/zulajadivedadomek.pdfIn PDF document text
    • http://mvdeastudio.it/userfiles/files/33543559072.pdfIn PDF document text
    • https://weekendtripskolkata.com/userfiles/file/veziwikexobipes.pdfIn PDF document text
    • https://dmshospital.com/mm_engg/files/rejibinapolukefisil.pdfIn PDF document text
    • http://xlpe.net/Images_upload/files/mijiwejotijuvebagotunedo.pdfIn PDF document text
    • http://ciba.lv/uploaded/file/58863996064.pdfIn PDF document text
    • http://ingegneriarossi.it/userfiles/files/65825146042.pdfIn PDF document text
    • http://gsoam.ge/wp-content/plugins/formcraft/file-upload/server/content/files/1613ef56475a8c---68596815909.pdfIn PDF document text
    • https://fultoys.com/userfiles/govekusu.pdfIn PDF document text
    • http://jshtextile.com/UserFiles/file///tiwapatexojixam.pdfIn PDF document text
    • http://locnuocvietmy.com/Images_upload/files/84009588236.pdfIn PDF document text
    • http://omeofest.eu/userfiles/files/xagapeweru.pdfIn PDF document text
    • http://makassitools.com/userfiles/file///39956575969.pdfIn PDF document text
    • http://groupelamiri.com/uploads/FCK_files/file/tezonirituxetadilos.pdfIn PDF document text
    • http://wronba.com/uploads/wysiwyg/file/gemisabeleki.pdfIn PDF document text
    • http://taxfreepoint.com/file/lalenaxomagukajak.pdfIn PDF document text
    • https://rkdestate.com/userfiles/file/lagezetajufuvolavevete.pdfIn PDF document text
    • http://phuquytravel.com/nguyenvanlinh/files/97040666876.pdfIn PDF document text
    • https://suemsas.com/wp-content/plugins/super-forms/uploads/php/files/c4mi7ck6bo6edvl5to7tsuqhd4/93099896309.pdfIn PDF document text
    • http://lejonhund.com/upload/riribumezevubofa.pdfIn PDF document text
    • http://kpdb.org/userfiles/files/melobomomurosozabe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=screen+swipe+effect+androidPDF 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_off0000e1ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1AC 17340 bytes
SHA-256: 25bf6354d7bdd7dddbe2172b43f9d43ebb50b20491ec5ff04a7bff5c6e993ee6
font_01_sfnt_off00010f0a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F0A 10728 bytes
SHA-256: 36331fc304299fb992ef3e5ab2c83bb4c20b81c46d79f56fe50bcf337cc4cf0f
font_02_sfnt_off000127db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127DB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1