Malicious PDF — malware analysis report

Static analysis result for SHA-256 618964b6d452de0f…

MALICIOUS

PDF

72.6 KB Created: 2021-09-17 08:03:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 29ebad69133162ec7db7bacf61458ed6 SHA-1: a2c605ac79807c3e0f5630f4191afbc1d99c3d77 SHA-256: 618964b6d452de0ff7c7a8552bccd0210786c283243c2e734f77c96fe83ae278
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF containing numerous links to external websites, many of which appear to be compromised or disposable hosting. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. The presence of embedded URLs and link farms suggests an attempt to redirect the user to a malicious site, potentially for credential harvesting or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

Heuristics 7

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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=volte+redmi+note+9+pro PDF link annotation
    • http://marketingnews.fr/images/file/96318708919.pdfIn PDF document text
    • http://photopuzzle.net/userData/board/file/zosif.pdfIn PDF document text
    • http://goldendoodlesofthesierranevadas.com/userfiles/file/30427873935.pdfIn PDF document text
    • https://imaggu.com/ci/userfiles/files/somilanofinuxowijovanotu.pdfIn PDF document text
    • http://ttccid.com/userfiles/files/lilukaloposemizebufidape.pdfIn PDF document text
    • http://www.mtpartnersfl.com/wp-content/plugins/formcraft/file-upload/server/content/files/161303f951a171---mubetajafizupe.pdfIn PDF document text
    • http://kamakuralosgatos.com/uploads/files/vosulevo.pdfIn PDF document text
    • http://lpxs168.com/filespath/files/20210907073029.pdfIn PDF document text
    • https://www.truesdalepainting.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e75768ccf0---tuzafebulegoxavujok.pdfIn PDF document text
    • https://khoahoc.timviec365.com/picturesfiles/norenagilozurilukeg.pdfIn PDF document text
    • https://www.channeloflove.com/ckfinder/userfiles/files/vojuxotefulogabinov.pdfIn PDF document text
    • http://goldmustang.com/files/files/41306564531.pdfIn PDF document text
    • https://fereshtegan.net/basefile/fereshtegannet/files/dufok.pdfIn PDF document text
    • https://gornjastubica.hr/files/rekatotanelijajiwam.pdfIn PDF document text
    • https://piphoto.tw/uploads/files/202109061146573205.pdfIn PDF document text
    • https://pierrelemagicien.com/userfiles/file/xowikopojodavulazasejo.pdfIn PDF document text
    • http://evohome.pl/userfiles/file/52468115519.pdfIn PDF document text
    • http://www.appsolutely.sg/wp-content/plugins/formcraft/file-upload/server/content/files/161350d47700f9---salitowulexapuzuwigojedex.pdfIn PDF document text
    • https://saint-florentin.charcutier-traiteur.fr/ckfinder/userfiles/files/sedaninekupabulim.pdfIn PDF document text
    • http://www.ks-klinika.ru/ckfinder/userfiles/files/60990596986.pdfIn PDF document text
    • http://preiss.at/upload_files/files/vusimuti.pdfIn PDF document text
    • http://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a16e1e38b8---fexegobelidajirivizapuk.pdfIn PDF document text
    • http://kwiatmetal.pl/userfiles/file/wavobiniputis.pdfIn PDF document text
    • https://mobilaide.com/upload/editor/file/66280749560.pdfIn PDF document text
    • http://superfasttv.com/uploads/files/732150249.pdfIn PDF document text
    • http://amexeuro.com/an3_Uploads/file/23419815157.pdfIn PDF document text
    • http://lineshare.net/upload/files/20210901193013.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_off0000bcdb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBCDB 10360 bytes
SHA-256: 433289c2df305157aedadb67ba5c9480982bb36c8b8717692781010af70581dc
font_01_sfnt_off0000d431.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD431 15828 bytes
SHA-256: a62a36520517b3ee8552e08e6a4ece01a5cdf9cda7ae9faf2b9afa86f42ab591
font_02_sfnt_off0000fc93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC93 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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