Malicious PDF — malware analysis report

Static analysis result for SHA-256 e781272b4608b7bb…

MALICIOUS

PDF

81.7 KB Created: 2021-09-17 19:20:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 50a03f1503b2d41e30a53a7ac3a103ec SHA-1: 97e735a6ba75457e8391998e44260c40a727c4c2 SHA-256: e781272b4608b7bb819576e5d8af81d557f1205dc04df4496438424eace47ba0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by ML classifiers and ClamAV. It contains numerous embedded URLs, many of which point to compromised CMS upload storage or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of external URI heuristics and the overall structure indicate an attempt to leverage these links for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://smidgel.ru/uplcv?utm_term=sing+free+karaoke+apk+download PDF link annotation
    • http://www.andreapondika.cz/file/tosewalukop.pdfIn PDF document text
    • https://noursportevents.com/wheelmarine/userfiles/file/risofazivegapumufijal.pdfIn PDF document text
    • http://unipsyclinic.com/userfiles/file/20210906042000.pdfIn PDF document text
    • http://gzperson.com/uploadfile/files/bomitowuj.pdfIn PDF document text
    • http://aksaaydinlatma.com/img/editor/image/file/6912614129.pdfIn PDF document text
    • http://neodev.space/wp-content/plugins/formcraft/file-upload/server/content/files/16142d1494653e---44860016744.pdfIn PDF document text
    • http://mgmkt.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1612eb15ba6c25---sepero.pdfIn PDF document text
    • https://isitekmuhendislik.com/userfiles/file/73262688964.pdfIn PDF document text
    • http://mikailang.net/userfiles/file/20210917220915_1691223259.pdfIn PDF document text
    • http://gwtcs.org/Content/uploads/files/boxex.pdfIn PDF document text
    • https://cytokin.ca/upload/editor/file/63148759317.pdfIn PDF document text
    • http://maihome.hu/admin1/file/97115813180.pdfIn PDF document text
    • http://jinruily.com/UploadFile/file/20210908152741512.pdfIn PDF document text
    • https://aslimitada.com/userfiles/file/jegugitokekawugekiz.pdfIn PDF document text
    • https://oancora.com/ckfinder/files/dowosol.pdfIn PDF document text
    • http://www.training4thefuture.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1612f41a6750ca---29476077816.pdfIn PDF document text
    • https://marksiegeldds.com/wp-content/plugins/super-forms/uploads/php/files/615d0cc34c22ef36d39d0fef37aafaef/zemolagovubijegefopezapuf.pdfIn PDF document text
    • http://energosol.pl/images_cms/file/kinodavugalomuwufa.pdfIn PDF document text
    • http://tks-forever.com/upload/2021/09/01/file/jaburovaxikowekotuxiluf.pdfIn PDF document text
    • http://dabien.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/1613c7ef365b65---watedefezisirapeka.pdfIn PDF document text
    • http://itexpertdog.nwoasis.com/upload/files/lakobi.pdfIn PDF document text
    • http://www.impactit.in/ckfinder/userfiles/files/86161007081.pdfIn PDF document text
    • http://www.bash.cl/media/file/pifixamiso.pdfIn PDF document text
    • http://bloomx.com/sites/all/sites/bloomx.com/files/94658272643.pdfIn PDF document text
    • http://ghettaetamionarchitetti.it/userfiles/files/butetovimamas.pdfIn PDF document text
    • http://autosoftware.company/autoresponders_images/files/sevefijexarupodasevam.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_off0000dada.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDADA 17372 bytes
SHA-256: 42f46d6d869d1c19780e57ac585da042648761079084eebbce027ee5347e2e71
font_01_sfnt_off00010839.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10839 10660 bytes
SHA-256: a31c0870b4efae9a55eb56a8430c996d68713908ebcdd029bba20670bef97956
font_02_sfnt_off00012098.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12098 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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