Malicious PDF — malware analysis report

Static analysis result for SHA-256 9ab238e070ac2609…

MALICIOUS

PDF

84.4 KB Created: 2021-08-31 12:48:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 880426e449cfcbcf5f372e5d0f610451 SHA-1: 6d97f004fabf71a0683f0e29e32c48d76b8cf6a6 SHA-256: 9ab238e070ac2609bbd8b748972ceb287cbd733e038a7d9ebf73a603e4115480
156 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links, many pointing to compromised CMS uploads and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of multiple external URIs and link farms indicates a phishing or redirection attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9983

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://realimpacto.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608de5f9817a4---meremoxatugarif.pdf In PDF document text
    • http://metaglas.kr/userData/board/file/kujupomopeget.pdfIn PDF document text
    • http://zpb-maciejewski.pl/upload/fck/file/48682177662.pdfIn PDF document text
    • http://goksirlambinowice.pl/img/upload/files/wavezutilirirajiripori.pdfIn PDF document text
    • http://www.etoiles-recrutement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611c030149ec4---vuxenes.pdfIn PDF document text
    • http://zovsh.com/Uploadfiles/files/18370291422.pdfIn PDF document text
    • https://wilocom.ro/ckfinder/userfiles/files/92532004160.pdfIn PDF document text
    • https://consurs.ro/ckfinder/userfiles/files/dolis.pdfIn PDF document text
    • http://baschin-heizung.com/meineBilderAlbertGrundschule/file/nujiwumutotemoket.pdfIn PDF document text
    • http://canadanur.com/resimler/files/dipusorebumu.pdfIn PDF document text
    • http://stylekd.ru/files/pizagileberutoriwe.pdfIn PDF document text
    • https://iamluno.com/wp-content/plugins/formcraft/file-upload/server/content/files/160982615ed2f3---ravevew.pdfIn PDF document text
    • http://capmar.eu/userfiles/file/wugetinunifizinigo.pdfIn PDF document text
    • https://wemservice.com/ckfinder/userfiles/files/resenemozisikesiwa.pdfIn PDF document text
    • http://www.ddd-iasi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16073d3c0dcbd4---zufujunizegi.pdfIn PDF document text
    • http://infinity-pro.ru/userfiles/file/womiburajukawesav.pdfIn PDF document text
    • http://asiadomainstore.com/userfiles/file/zukiposazomum.pdfIn PDF document text
    • https://srilangkapools.com/contents//files/92200341686.pdfIn PDF document text
    • https://glasschneider.koeln/wp-content/plugins/super-forms/uploads/php/files/utcehd8ian6ihm3nfepemjq2rr/92381148988.pdfIn PDF document text
    • http://adaviestransportltd.com/userfiles/file/5781608447.pdfIn PDF document text
    • https://www.pennlighting.com/wp-content/plugins/super-forms/uploads/php/files/5d430874559d856180684cb210e6d915/27575447928.pdfIn PDF document text
    • http://xn--spreewaldpension-lbben-9lc.de/meineBilderAlbertGrundschule/file/99575295681.pdfIn PDF document text
    • http://stkvn.ru/wp-content/plugins/super-forms/uploads/php/files/2c00495f31aca170d48ea20e3622c199/waxoxaj.pdfIn PDF document text
    • http://ibb-online.ru/f/file/vubasukasuwejatafuva.pdfIn PDF document text
    • https://rumahbaruku.com/contents//files/guzikafamifepegunutaxip.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=electric+power+distribution+system+engineering+solution+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_off0000e23f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE23F 11280 bytes
SHA-256: 9273c0fcdb1ad1065f64e7e8b9ede069abe140148aa2e0891dc27059e613a78a
font_01_sfnt_off0000fc53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC53 17824 bytes
SHA-256: 312fe59dec9861f7ec3edf039202b162099305032290a9c63bb6fc42659dfc20
font_02_sfnt_off00012a64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A64 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1