Malicious PDF — malware analysis report

Static analysis result for SHA-256 643e2c99908c097e…

MALICIOUS

PDF

80.7 KB Created: 2021-09-02 04:19:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: a0adca5cf262691294b33f44a32b14b1 SHA-1: eca365553df308df4a6737f6452b67edaa7539f1 SHA-256: 643e2c99908c097e29a8e6d864bede02cb6a54cc38b572f3bf060dcae76a6b0f
156 Risk Score

Malware Insights

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

The PDF file contains a link farm pointing to numerous URLs, many of which are hosted on compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of multiple links on disposable or compromised hosting suggests an attempt to evade detection and distribute malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://flylights.pl/wp-content/plugins/super-forms/uploads/php/files/cagbghmdfuad5oahna0mvh9690/3083804901.pdf In PDF document text
    • https://aravlicraft.com/cmsCart//upload/file/40364908207.pdfIn PDF document text
    • http://stembridgefamilyreunion.com/clients/0/0d/0db03be1a97f3028174cafb645c8c91f/File/37070457922.pdfIn PDF document text
    • http://recruiters-zone.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fd0c3519f9---gixebuxa.pdfIn PDF document text
    • https://al-wesam.com/userfiles/files/67210393502.pdfIn PDF document text
    • http://jcbcharpentebois.com/ressource/site-image/files/89960081952.pdfIn PDF document text
    • http://milcontabil.com.br/wp-content/plugins/super-forms/uploads/php/files/fm81f9uu3prkvm24er3hk2g1p6/rezijadixixekudazorilodur.pdfIn PDF document text
    • https://deltarealestate-eg.com/userfiles/file/659351203.pdfIn PDF document text
    • http://dodici12.ru/wp-content/plugins/super-forms/uploads/php/files/5tbc7vg7ln44j3bnsi3j51f136/biruzanafojomifum.pdfIn PDF document text
    • https://www.techsrollout.com/wp-content/plugins/formcraft/file-upload/server/content/files/160821172c914d---bakafuroruw.pdfIn PDF document text
    • http://www.trimbleexpress.sk/wp-content/plugins/formcraft/file-upload/server/content/files/1606f2c4a0f7e8---zofesalupelosesaba.pdfIn PDF document text
    • http://drstevealbrecht.com/wp-content/plugins/super-forms/uploads/php/files/5e8fe3f2ebe88cae2310547a0bfb93f4/42170096278.pdfIn PDF document text
    • https://mobile-translator.eu/app/webroot/media/files/muxakufinibaw.pdfIn PDF document text
    • http://mxm-hosting.nl/img/editor/file/26644592685.pdfIn PDF document text
    • https://betalinktech.com/blmedia/file/ximubu.pdfIn PDF document text
    • http://dainindo.com/Uploads/userfiles/files/34187565928.pdfIn PDF document text
    • http://neonatal-surgery.ru/userfiles/files/23422073356.pdfIn PDF document text
    • http://www.aamuhsv-madisonalumni.org/files/files/339777637.pdfIn PDF document text
    • https://varbackaforskola.se/ckfinder/userfiles/files/61215185986.pdfIn PDF document text
    • https://felicitareonline.ro/ckfinder/userfiles/files/jajimemijefalasumeko.pdfIn PDF document text
    • https://www.burit.net/wp-content/plugins/formcraft/file-upload/server/content/files/160be3b6627a6b---dumofosezolibonag.pdfIn PDF document text
    • https://pinotcar.com/wp-content/plugins/super-forms/uploads/php/files/d734a9f9787aaf6f327e42b21eee4d09/72858127473.pdfIn PDF document text
    • https://www.oasipizza.it/wp-content/plugins/formcraft/file-upload/server/content/files/1609144f694e53---16851166681.pdfIn PDF document text
    • http://nacyc.jp/Upload/file/febadevekufanuroxopakugiw.pdfIn PDF document text
    • http://www.suffaheducation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160875238a4d69---55140425010.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=english+for+business+administration+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_off0000d9a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9A5 16160 bytes
SHA-256: 38aa098d40248bf6f068b3ad5fb1bc5be977a2253807d07ab1e6d2f8e3527ae4
font_01_sfnt_off00010359.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10359 11168 bytes
SHA-256: 5155cdd70e16b5f597b9a027abf462e04f6d83c64990a4d200171a5e9404fcae
font_02_sfnt_off00011cce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CCE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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