Malicious PDF — malware analysis report

Static analysis result for SHA-256 b79a215d19d58803…

MALICIOUS

PDF

87.6 KB Created: 2021-09-04 22:26:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 53b16724d6cca710f8fb2258f66b252e SHA-1: 7ec97b070d6ef0dfb0b7b4c5b99dad0d6c0176f7 SHA-256: b79a215d19d5880318e94b53432bfe5dc793f8ec820e5c3869fce1f7ce28af6b
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised WordPress installations and disposable hosting, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded links are indicative of a malicious campaign, likely aiming to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://hsiaoying.com/userfiles/file/6174110243.pdf In PDF document text
    • http://balade-pierry.fr/userfiles/file/ribudadapojunipavigu.pdfIn PDF document text
    • https://baongochoa.com/upload/file/7400675310.pdfIn PDF document text
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/ol3m48aces8rc090i7i5fqolv3/biwajumuzurelededitinom.pdfIn PDF document text
    • http://thetestmag.com/userfiles/files/likifisekujofugader.pdfIn PDF document text
    • http://www.altrus.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160765ef0e62ce---84269511638.pdfIn PDF document text
    • http://www.kreasoft.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1606fcf94cd03b---majobiti.pdfIn PDF document text
    • http://xn--80akij1ajew.xn--p1ai/wp-content/plugins/formcraft/file-upload/server/content/files/16100ef7c7eba6---dadiriwup.pdfIn PDF document text
    • https://xulynuocphangiathinh.vn/images/pic/file/ridib.pdfIn PDF document text
    • https://profbuhotchet.ru/wp-content/plugins/super-forms/uploads/php/files/cacdb191264fb878de3e0af01ea35e5b/wanapizuvapoxeradugirax.pdfIn PDF document text
    • http://www.medicalalliedtraining.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ff7d0c0bf4---julenesonoxeko.pdfIn PDF document text
    • http://cualuoiskydoor.com/webroot/img/files/kukadafudovorafoseredoxer.pdfIn PDF document text
    • https://www.golddustdental.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab7647a58dc---kutovipobubetizalabu.pdfIn PDF document text
    • http://naszymsladem.pl/upload/file/24694065363.pdfIn PDF document text
    • http://aeusjtu.pretty-match.com/upload/files/fezekojidodata.pdfIn PDF document text
    • http://rund.cz/UserFiles/File/64714651955.pdfIn PDF document text
    • https://www.histoiresdegroupes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606e749aa9e65---tevojes.pdfIn PDF document text
    • http://discarga.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072495fe4ac9---kaxidukaregufabaletutolek.pdfIn PDF document text
    • https://lecourbe.dk/userfiles/file/93679364980.pdfIn PDF document text
    • https://www.horisunmauritius.com/wp-content/plugins/super-forms/uploads/php/files/ab39b5a1a3fbe95cca7c26f644e7308f/20619486576.pdfIn PDF document text
    • http://kondicionery-ivanteevka.ru/upload_picture/file/zedigepibuko.pdfIn PDF document text
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/383a56648692c36fc275ae199347935a/39570618707.pdfIn PDF document text
    • http://milcontabil.com.br/wp-content/plugins/super-forms/uploads/php/files/8eas6dsnhsich4rkleebdjd9p4/49750291068.pdfIn PDF document text
    • http://captainkillmite.com/uploads/files/202108220555513084.pdfIn PDF document text
    • http://ruihuitax.com/files/file/79318906117.pdfIn PDF document text
    • http://rencontres-icare.org/userfiles/file/59891364260.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=targus+multimedia+presentation+remote+manualPDF 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_off0000ef30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF30 10796 bytes
SHA-256: 09b2b3622d9938409d1a529cef994a080ed797dee82756770b83f4f8d2c06919
font_01_sfnt_off000107d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107D0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011fe2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FE2 18444 bytes
SHA-256: ef45cf1fa5e2c1d3641e95de624b38721bd1ecb441ec68f8dd83866088a5ccc5

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