Malicious PDF — malware analysis report

Static analysis result for SHA-256 1c9243d96dcf10be…

MALICIOUS

PDF

72.1 KB Created: 2021-09-26 19:08:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 1434fbc542e35d4dc39d14744af22400 SHA-1: 77def272107862c1c23d7a0be3c534d14ea6334b SHA-256: 1c9243d96dcf10bec81b763170e4bf5dcd34ca6ea74b67e3969558315b5eff5b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains a link farm pointing to various domains, likely for phishing or malware distribution. The presence of external URIs and link farms suggests an attempt to redirect users to malicious websites, aligning with phishing and potentially initial access via spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://allytemp.ru/uplcv?utm_term=metal+slug+4+apk PDF link annotation
    • http://albertf.madteam.net/ckfinder/userfiles/files/66869822844.pdfIn PDF document text
    • http://quatanggiabao.com/images/uploads/files/35683862236.pdfIn PDF document text
    • http://commissioncollectionlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/7182516536.pdfIn PDF document text
    • http://expertsystemgroup.com/file_media/file_image/file/repugofudowuz.pdfIn PDF document text
    • http://maxitelt.no/wp-content/plugins/formcraft/file-upload/server/content/files/1612fcfffcff53---bifukivas.pdfIn PDF document text
    • http://www.kinoimaging.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161405c6ad7d69---29762820701.pdfIn PDF document text
    • https://soswzgierz.pl/web/uploads/files/sipanemotepikusibotet.pdfIn PDF document text
    • https://nam.it/wp-content/plugins/formcraft/file-upload/server/content/files/16132ab0862da3---gelezoboripirani.pdfIn PDF document text
    • https://keralatemples.info/ckfinder/userfiles/files/rulipokena.pdfIn PDF document text
    • https://west-holding.com/userfiles/file/nudijatotin.pdfIn PDF document text
    • http://sendedianqi.com/upload_fck/file/2021-9-25/20210925093517983886.pdfIn PDF document text
    • https://fotokeramika.bg/userfiles/file/77650527677.pdfIn PDF document text
    • http://www.donboscovizag.org/images/files/basebaxarugunulajos.pdfIn PDF document text
    • https://ripedzn.com/app/webroot/files/fckeditor/file/91190909672.pdfIn PDF document text
    • https://biocenfis.es/uploads/assets/file/kanerogusepepave.pdfIn PDF document text
    • http://thrifty-uy.com/files/others/tixediporimigazikudi.pdfIn PDF document text
    • http://locthanhwindow.com/img_duhoc/files/lufepuvabe.pdfIn PDF document text
    • http://cosmikkino.ru/sadm_files/noligemoge.pdfIn PDF document text
    • http://proreferee.ru/uploads/ckfinder/files/dipalu.pdfIn PDF document text
    • https://aquariumfargo.com/wp-content/plugins/super-forms/uploads/php/files/29132c62ff76a6774db4bbfbfefc488f/35650680563.pdfIn PDF document text
    • http://ottomaniantextile.com/userfiles/file/vabedegor.pdfIn PDF document text
    • http://decorstore.eu/upload/file/zoguluxe.pdfIn PDF document text
    • http://www.chiringuitomediterraneo.com/ckfinder/userfiles/files/5932453801.pdfIn PDF document text
    • https://biogenetixpharma.com/ci/userfiles/files/ranigozusuwikujusejiba.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_off0000b55f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB55F 10272 bytes
SHA-256: 5be8655703e6baa0e651d9fd85f56b2e3d97aa565d371b7c50e78e577bdaef1e
font_01_sfnt_off0000ccb8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCB8 17860 bytes
SHA-256: 8eeeb2416087acb865e40ecc14a98f748f1dce7b7cea0ded3458a14fbe2e3a5b
font_02_sfnt_off0000faf3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAF3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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