Malicious PDF — malware analysis report

Static analysis result for SHA-256 e814a9bcd6fe49dd…

MALICIOUS

PDF

85.7 KB Created: 2021-10-10 20:08:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: c8109bc60064e16c28ebce7497d71da5 SHA-1: ac818968fbfa746856b7d8ae5a9b7e137f27043b SHA-256: e814a9bcd6fe49dd79f7eeab6c0a4b49e183b063d9a15a47283442a79637d8ac
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external PDFs hosted on compromised websites and disposable domains, indicating a link farm designed to distribute malware. The ClamAV detection and ML classifier strongly suggest malicious intent, likely to deliver a second-stage payload. Although no scripts were explicitly extracted, the PDF structure and heuristic firings point towards a phishing or malware distribution scheme.

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 http://asiancfea.org/userfiles/file/sixerab.pdf In PDF document text
    • https://cmr.ribi.bg/files/49259702753.pdfIn PDF document text
    • https://svezadjecu.me/userfiles/file/nafowubixefifet.pdfIn PDF document text
    • http://allprintusa.com/admin/images/file/bagasizunelinefew.pdfIn PDF document text
    • https://aslimitada.com/userfiles/file/41051727874.pdfIn PDF document text
    • http://paddockj.com/user_data/editor/ckfinder/core/connector/php/upload/files/mipusovu.pdfIn PDF document text
    • http://techbis.pl/files/file/57481288271.pdfIn PDF document text
    • http://retailpark.bg/uploads/wysiwyg/files/ranedemopatabejasi.pdfIn PDF document text
    • http://hawaiianhunareiki.it/file/39013291031.pdfIn PDF document text
    • http://vvk-wiedermann.at/userfiles/file/rusoguzonuwimisuwaki.pdfIn PDF document text
    • https://www.keystonecare.co.uk/wp-content/plugins/super-forms/uploads/php/files/223151edc68a8df1b72e677ed1f55057/tikugonajomidutex.pdfIn PDF document text
    • http://dhalahoredeals.com/survey/userfiles/files/96624595689.pdfIn PDF document text
    • http://baaningdoi.com/file_media/file_image/file/jalizuxomasodibawijil.pdfIn PDF document text
    • https://hometeamcorp.com/images/usr/zitiluwomumitabero.pdfIn PDF document text
    • https://e-midas.ro/files/file/74381948143.pdfIn PDF document text
    • https://ecableapp.com/FCKeditor/FCKimgUpload/file/wegufugubol.pdfIn PDF document text
    • http://lucidareemantenerepavimentifaidate.it/userfiles/files/dudov.pdfIn PDF document text
    • http://asirius.su/wp-content/plugins/super-forms/uploads/php/files/6eb22c8ea94e01137d3aa3efd02e7db8/zofixisemi.pdfIn PDF document text
    • https://jordanadams.com/ckfinder/userfiles/files/vuxuwil.pdfIn PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/073281000e3b81fb39623517e11c1d80/18470078603.pdfIn PDF document text
    • http://www.gitialiganjlko.org/ckfinder/userfiles/files/gobekufarebemajilef.pdfIn PDF document text
    • http://weiddy.com/uploads/files/202109251250193068.pdfIn PDF document text
    • https://polytex.de/sites/default/files/zexajivubemiketerag.pdfIn PDF document text
    • http://balmybnb.com/t/tutorfirm/uploads/ck/files/pilukapitijemopekumogo.pdfIn PDF document text
    • http://cuboni.com/uploadfile/hong202110102246065823.pdfIn PDF document text
    • http://archissimo.eu/userfiles/files/jigawelofezirusoraxoj.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=tybsc+computer+science+notes+pdfPDF 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_off0000e7fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7FC 18336 bytes
SHA-256: 03a2fa1244943337e6badaab26ff2523bea92ee79d73228e50964995e6cb517a
font_01_sfnt_off000117b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117B3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012fca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12FCA 10892 bytes
SHA-256: 4d76af7217494a18958dd7e930a5b8f3a3fa33d67142d07bc90080605299a055

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