Malicious PDF — malware analysis report

Static analysis result for SHA-256 40876ec5b4b984a5…

MALICIOUS

PDF

249.6 KB Created: 2021-06-27 18:28:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 2b519d460ca462c6c0053d13051851b4 SHA-1: 8b5cd9d2cfdddb0a148f6b3761567145bacedb62 SHA-256: 40876ec5b4b984a5c7cf693703fe427dc32d910e2f2b8d63b7a19c1c0581286a
194 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics suggest it employs a phishing lure, likely to trick users into downloading a malicious file, as evidenced by the numerous compromised CMS upload links and redirector URLs. The document body is heavily obfuscated, preventing a clear understanding of its specific content, but the overall pattern points to a phishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9802

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) or Microsoft license-boilerplate documents that carry no urgency or charge/dispute escalation.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://sotel-perm.ru/site/file/pevovoketewixozosiwopib.pdf In PDF document text
    • http://gsoam.ge/wp-content/plugins/formcraft/file-upload/server/content/files/160c2bbb6da60f---63328867544.pdfIn PDF document text
    • http://alvasari.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608fd610499c0---bebukugozoluxo.pdfIn PDF document text
    • https://www.die-umzugsfabrik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160925e13d37d3---zuxizumut.pdfIn PDF document text
    • http://www.garriagricola.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b9ad6b40f79---98990584470.pdfIn PDF document text
    • http://www.meglobalinc.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16084ce5080223---jadedexelaz.pdfIn PDF document text
    • http://herodumpsterrental.com/wp-content/plugins/super-forms/uploads/php/files/edab45f2bd31a66e164d536a2caf8da5/71398283212.pdfIn PDF document text
    • http://bioident.pl/photos_fck/file/1145876291.pdfIn PDF document text
    • https://qamarapps.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bfa7cfc8806---gizoduxikamawuj.pdfIn PDF document text
    • https://nnkcreations.com/userfiles/file/13578083190.pdfIn PDF document text
    • http://amdind.com/userfiles/file/95692932127.pdfIn PDF document text
    • http://fedime.org/imagenes/guvebof.pdfIn PDF document text
    • https://walkandsmile.com/userfiles/file/matofinukotodofogubo.pdfIn PDF document text
    • http://www.chicagoalphas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160762873b8353---davinawonafoluxuwul.pdfIn PDF document text
    • http://bazatalty.pl/wp-content/plugins/super-forms/uploads/php/files/4c2952c53cfe5cccde728ef71ad5d44d/26896984102.pdfIn PDF document text
    • https://faresaldabbous.com/uploads/files/36915404022.pdfIn PDF document text
    • https://bmw-zona.ru/uploads/file/dudazenekupipakerekinom.pdfIn PDF document text
    • https://atcotourismtravel.com/userfiles/file/67015707686.pdfIn PDF document text
    • https://www.kalirich.com/wp-content/plugins/super-forms/uploads/php/files/3pni0n0hlefgeh0efl8tuo4mc0/zorifuxodipojiramofu.pdfIn PDF document text
    • https://bykevin.com/wp-content/plugins/super-forms/uploads/php/files/d67e549619f5a5d32d13b4ca7bd18ddb/70164883721.pdfIn PDF document text
    • http://mfplus.ba/wp-content/plugins/formcraft/file-upload/server/content/files/160822e514e5a5---nabopatiweg.pdfIn PDF document text
    • http://asustainable.com/global/file/wivipuzeraki.pdfIn PDF document text
    • http://wksystems.net/HotelEstimator/userfiles/file/rexevexaxefepezebukuses.pdfIn PDF document text
    • http://erfolgsapp.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607216adc4960---65669273639.pdfIn PDF document text
    • https://larrialdiak.es/files/galeria/files/bilemitopejivubax.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=labor+relations+act+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_off00037980.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x37980 10708 bytes
SHA-256: 2bdcc0e4f9fcec418c2e5df1267eb37ffa9020b2625bc2f740216f06e8dd9ad0
font_01_sfnt_off000391f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x391F9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0003aa0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3AA0B 17508 bytes
SHA-256: 36ce9e2e1c67d272f306c15bebc4c02246174b0fefa027f547da0d93b99e6264

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