Malicious PDF — malware analysis report

Static analysis result for SHA-256 8b104b7301a38f0b…

MALICIOUS

PDF

137.7 KB Created: 2021-07-09 03:30:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 5250f8dabe1e6cc4567d29880d198917 SHA-1: d4fa3511021ce55f7117f0de12c458dd1b1ae56c SHA-256: 8b104b7301a38f0b60395b55ab377d0cfa3126803ee9da5c9fcad385435565d7
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF document contains numerous embedded URLs pointing to compromised websites, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were directly extracted, the structure and embedded URLs are indicative of a phishing or malware distribution campaign, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9913

Heuristics 7

  • 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.
  • 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 https://inwebjor.ru/uplcv?utm_term=instrument+to+measure+turbidity+of+water PDF link annotation
    • http://www.segurosfacility.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16082e4783743f---gawuwupazutunim.pdfIn PDF document text
    • http://kino-profi.com/wp-content/plugins/super-forms/uploads/php/files/aa39f0032688f29c5801ca76cd00b239/98752868305.pdfIn PDF document text
    • https://mountainbrookbuilders.com/home/mountain/public_html/ckfinder/userfiles/files/feputemotenusosusosubipiw.pdfIn PDF document text
    • http://hungthanhauto.com/luutru/files/fijejexobuxazodufududib.pdfIn PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/c2f0b578896788b892599704c15c0bcb/64866942530.pdfIn PDF document text
    • http://sakaryakasaplarodasi.org/userfiles/file/wisuwurugonuniwixek.pdfIn PDF document text
    • http://pixel-pro.ru/upload/file/28146053785.pdfIn PDF document text
    • https://www.formwork.co.uk/wp-content/plugins/super-forms/uploads/php/files/24r2h8oef9esr9c35cs9lgicko/fogukalepuzaveparomikek.pdfIn PDF document text
    • http://www.magicapro.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607330a7d4515---xuriteve.pdfIn PDF document text
    • https://ebooksweb.net/files/file/93694426150.pdfIn PDF document text
    • http://nage-z.com/ckfinder/userfiles/files/24159720957.pdfIn PDF document text
    • http://www.climatisur.com/ckfinder/userfiles/files/jalakini.pdfIn PDF document text
    • http://smartmedicaleg.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4c219cfb90---55530781526.pdfIn PDF document text
    • http://digimaap.com/wp-content/plugins/super-forms/uploads/php/files/dngp4c9m9769q8k9k47as1940c/jugagukelalenow.pdfIn PDF document text
    • https://bodegoncriollo.com/userfiles/file/jalonine.pdfIn PDF document text
    • https://www.medicalart.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1606ef5e87d11e---96326443797.pdfIn PDF document text
    • http://dambi.pl/userfiles/file/xujax.pdfIn PDF document text
    • https://www.rath-catering.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a5eec8d8298---46667180273.pdfIn PDF document text
    • https://digireg.es/upload/fewagipijotugojijobem.pdfIn PDF document text
    • http://drairtools.com/ckfinder/userfiles/files/serotubiwiretofab.pdfIn PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/db482ba726547c9179e225970922c311/tikazeluna.pdfIn PDF document text
    • https://www.formwork.co.uk/wp-content/plugins/super-forms/uploads/php/files/c7qhqvnt5m3rms224pbv1ojohm/16899194604.pdfIn PDF document text
    • http://www.belladermeestetica.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606ef37a99f1e---wabegupuwonapawasitaz.pdfIn PDF document text
    • https://betonwerkendejonge.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160aab30d2c522---negetagefusulatikoduvo.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001b7a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B7A3 10860 bytes
SHA-256: 5b6e14b77f3597d1664e17cb7b4d04955887ecfda5b959210f17d5988be4802d
font_01_sfnt_off0001d0ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1D0CA 18164 bytes
SHA-256: 72f97dc5be0f407a2da268552196f8386d60e068028a87c0cce239b25e2cf2e0
font_02_sfnt_off000200d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x200D3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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