Malicious PDF — malware analysis report

Static analysis result for SHA-256 db409b26df6e3eff…

MALICIOUS

PDF

81.1 KB Created: 2021-09-05 18:21:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 4c5e1ab05638502547f0f42b4a419ce8 SHA-1: 0a469b74fc380b7c21d28fbeddca12b5a0f9fa13 SHA-256: db409b26df6e3eff92b552134cfe4c78bcfcae14e526b1dbe0ad75407f360224
116 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised WordPress upload directories and disposable hosting, indicative of a link farm designed for SEO manipulation or to host malicious content. The ML classifier strongly flagged this PDF as malicious. While no scripts were directly extracted, the structure and heuristic firings suggest an attempt to redirect users to potentially harmful sites, possibly as part of a phishing or scam campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

Heuristics 6

  • 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.
  • 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) documents that carry no urgency or charge/dispute escalation.
  • 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://mediabandit.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092f3be1028e---86942546114.pdf In PDF document text
    • https://cls-toronto.com/wp-content/plugins/super-forms/uploads/php/files/46dc48c91f777959d02085b225f28d74/1868979125.pdfIn PDF document text
    • https://christianklein.eu/Quansis/ckfinder/userfiles/files/2586672954.pdfIn PDF document text
    • http://starkhigh1972.com/clients/d/dd/dd83d6d7846a033806cdb512e10d7d7c/File/37784420533.pdfIn PDF document text
    • https://capecoralliving.com/media/file/nivexifubogofomutigur.pdfIn PDF document text
    • https://latrinquette.com/upload/editor/file/jibufatelevuf.pdfIn PDF document text
    • http://wongkungfu.ca/clients/f/f5/f5c316b966f29b3192b3e9e3c5714b3c/File/jiwetu.pdfIn PDF document text
    • https://mariellatriolo.it/public/file/41201687800.pdfIn PDF document text
    • https://graffitipaintstudio.com/wp-content/plugins/super-forms/uploads/php/files/91e3693f008cc957a5128ec7e0c58d57/31282043122.pdfIn PDF document text
    • https://www.temsilcisitesi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160707d07e73d6---jarizivoxinagitux.pdfIn PDF document text
    • http://eco-versute.com/app/webroot/ckfinder/userfiles/files/xoluvobimir.pdfIn PDF document text
    • https://vizzzio.ru/wp-content/plugins/super-forms/uploads/php/files/f5d744425a8cc8bb239861749d7b3a69/nimovasuguwazukagibunudut.pdfIn PDF document text
    • https://adasms.fr/userfiles/file/10024189726.pdfIn PDF document text
    • https://trichynext.com/wp-content/plugins/super-forms/uploads/php/files/7cc985fbc5857b6ae21a554e16ade711/xewunibowuzanimanilef.pdfIn PDF document text
    • https://www.kuwaitpolyurethane.com/ckfinder/userfiles/files/35995158228.pdfIn PDF document text
    • http://soft-pro.hr/upload/datoteke/45468226058.pdfIn PDF document text
    • http://www.homefacelifters.com/wp-content/plugins/super-forms/uploads/php/files/dd90910bf48ff42358703798fb31fc48/21496754365.pdfIn PDF document text
    • http://bjjiffy.com/upload/mogepapibawoluluvamo.pdfIn PDF document text
    • https://cottingham-group.com/cufiles/files/goresakobawigadejejizo.pdfIn PDF document text
    • https://championsforchildren.org/wp-content/plugins/super-forms/uploads/php/files/1cce401cb1f09ddef9daeb7df0ba5077/terer.pdfIn PDF document text
    • http://takeacode.eu/user/d41d8cd98f00b204e9800998ecf8427e/file/33562715082.pdfIn PDF document text
    • http://elonsummerstorage.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a21f9a1f0d---repobilorugix.pdfIn PDF document text
    • https://luxurytravel-show.com/wp-content/plugins/super-forms/uploads/php/files/6c31a26bb835d2f292252d59cbec77cc/17235012380.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=recycling+of+lithium+ion+batteries+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_off0000d636.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD636 11468 bytes
SHA-256: 02a672ccfbdf2a4de2d751b6ca1e0b8851120d8986771610231cc7d14f96a56f
font_01_sfnt_off0000f0b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0B3 17788 bytes
SHA-256: 9c9d44e9d4db69d2b8145f14ecf48238830d1161961dac7795178c993ae16fd0
font_02_sfnt_off00011f1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F1C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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