Malicious PDF — malware analysis report

Static analysis result for SHA-256 f454909935cd1733…

MALICIOUS

PDF

97.2 KB Created: 2021-09-20 18:01:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 8e8842634a1a1c1628d26328de93baaa SHA-1: 8967b751840e10d2712c6312d7ee96d343e05203 SHA-256: f454909935cd1733ee971324b7b4eeacdaef55600978fb604d70f346701827bf
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to various domains, many of which appear to be compromised WordPress sites or disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' strongly suggest a link farm designed to redirect users to potentially malicious content. The ML classifier and ClamAV detection further support its malicious nature, indicating a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9979

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://laborke.ru/uplcv?utm_term=watch+stream+movie+online PDF link annotation
    • http://tuecpa.com/file_media/file_image/file/sizoxiradupujawax.pdfIn PDF document text
    • http://chinajnbt.com/images/upload/File/71593641833.pdfIn PDF document text
    • https://avenirpourtous.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1613f3ab136655---29328459853.pdfIn PDF document text
    • http://carrozzeriabosini.net/userfiles/files/woxoz.pdfIn PDF document text
    • http://genarchi.com/data/temp/file/zadaluwi.pdfIn PDF document text
    • http://kemenyseprosiklos.hu/upload/file/jasegesovalix.pdfIn PDF document text
    • http://25630638.kad.tw/kads/ckfinder/userfiles/files/wunulinogivexami.pdfIn PDF document text
    • https://bentzendesign.se/wp-content/plugins/formcraft/file-upload/server/content/files/1613d5b8f84871---67429072411.pdfIn PDF document text
    • http://asqcert.net/files/files/98893270970.pdfIn PDF document text
    • https://soroptimist.be/oldsite/intranet/ckeditor/ckfinder/userfiles/images/files/26861040813.pdfIn PDF document text
    • https://www.golaw.net/wp-content/plugins/formcraft/file-upload/server/content/files/16140e6b668049---fujisijifatezo.pdfIn PDF document text
    • http://agrostroi-proekt.ru/ckfinder/userfiles/files/xogizupaxososofobekixo.pdfIn PDF document text
    • https://flour.co.uk/ckfinder/userfiles/files/88529546146.pdfIn PDF document text
    • http://profitoolinfo.ru/ckfinder/userfiles/files/gavisifagevizevam.pdfIn PDF document text
    • http://inspirationallabels.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613041fee948b---lidazoxirajapaziko.pdfIn PDF document text
    • http://muacuoi.vn/Pictures/files/46519808055.pdfIn PDF document text
    • https://mimpishio2.com/contents/files/kowonow.pdfIn PDF document text
    • http://massintech.ru/img/outer/files/20869048224.pdfIn PDF document text
    • https://biholka.cz/uploades/userfiles/file/26969543870.pdfIn PDF document text
    • https://onecre.com/images/content/files/xikobogevivutozar.pdfIn PDF document text
    • https://bokaichenyu.com/upload/files/lixuratujexurazumebujabe.pdfIn PDF document text
    • https://polymadeniyaglar.com/fckeditor/userfiles/file/26744457223.pdfIn PDF document text
    • http://divapharma.com/uploaded/file/pabazativuxaxuladiniw.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_off000116e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116E4 10556 bytes
SHA-256: 713d4e0fa88d66d2442d22835d8686d01e7142aedb770d38e618f645a7600082
font_01_sfnt_off00012edc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12EDC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000146ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x146EE 18548 bytes
SHA-256: d9b96b528dbeb39da07dede208f357d77328d56c8a9c494c21301657c2a27616

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