Malicious PDF — malware analysis report

Static analysis result for SHA-256 b28bf1807fd2b539…

MALICIOUS

PDF

88.1 KB Created: 2021-07-02 21:14:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 80a7dcf93406d5479fc9a215ca2dfdd8 SHA-1: 590dcb6f21221f3646f73d840cafc81d6f7bf24c SHA-256: b28bf1807fd2b53916f23fe67ed6f85f4b9d50ff716993ddf762fa5c4c11f2ff
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code within documents. It also features numerous external URLs, many pointing to compromised WordPress sites, suggesting a link farm designed to redirect users. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or distributing further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://medvor.ru/uplcv?utm_term=stay+with+me+my+dear PDF link annotation
    • http://pmdrecycling.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094d6e7f3b5d---44456294944.pdfIn PDF document text
    • https://apz-arte.com/ckfinder/userfiles/files/mosotovevulijebozaguvokax.pdfIn PDF document text
    • http://nesthomes.in/userfiles/file/vapoxudisekiwujumoxal.pdfIn PDF document text
    • https://vmwarts.com/ecovic/file/gagodotanegixafag.pdfIn PDF document text
    • https://rmdschoolandcollege.com/wp-content/plugins/super-forms/uploads/php/files/ti2pjv4k6pnjh94simsf1c1742/29517582046.pdfIn PDF document text
    • https://arvikabc.com/images/uploadedimages/file/68537141176.pdfIn PDF document text
    • https://www.azulejositurry.com/wp-content/plugins/super-forms/uploads/php/files/31g7fsmj3gh76o0u19ot4tv392/61498043712.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607b045f2ba57---64468283722.pdfIn PDF document text
    • http://www.hotel-margherita.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa8708e3c1a---lenisoretasifoku.pdfIn PDF document text
    • https://messianic.live/wp-content/plugins/super-forms/uploads/php/files/6010cc6968d074b8a57552168804655f/limizimimuvo.pdfIn PDF document text
    • https://absoluteanytime.com/media_file/files/files/zebozusi.pdfIn PDF document text
    • http://kimhoatra.com/upload/fckimagesfile/21890146020.pdfIn PDF document text
    • http://lafayetteconnections.com/clients/52818/File/90214139636.pdfIn PDF document text
    • http://www.lbf-cosmetics.com/website/wp-content/plugins/formcraft/file-upload/server/content/files/160b9469bb3085---tagoxukevenuso.pdfIn PDF document text
    • https://beribuket.ru/wp-content/plugins/super-forms/uploads/php/files/d9874cb59f3eda99333edd16a9a83ce0/23043035988.pdfIn PDF document text
    • https://ahha.az/userfiles/file/wozopejavuzisesuxumeto.pdfIn PDF document text
    • http://komputerzagrosze.pl/userfiles/file/73768309845.pdfIn PDF document text
    • http://maxtarget.by/ckfinder/userfiles/files/71752394931.pdfIn PDF document text
    • https://accuratesearch.com/userfiles/file/84875828870.pdfIn PDF document text
    • https://polskieplytki.com/wp-content/plugins/super-forms/uploads/php/files/469acebfb388630ca6467bced3458fe9/letora.pdfIn PDF document text
    • https://discoverthesky.it/file/kadedunaxanibap.pdfIn PDF document text
    • http://to-kajihan.net/js/upload/files/64504256152.pdfIn PDF document text
    • https://interesttour.com/wp-content/plugins/super-forms/uploads/php/files/c3f5baa4a119b3c4f7fd99f83672c485/49405724771.pdfIn PDF document text
    • http://0-50.ru/userfiles/file/81463852172.pdfIn PDF document text
    • http://limoride.net/gallery/file/73335884626.pdfIn PDF document text
    • http://montaze.org/democms/userfiles/file/rixusagisukidafaj.pdfIn PDF document text
    • https://namastehealth.in/wp-content/plugins/super-forms/uploads/php/files/5ct1o59kk15i4i2oapo4ktju1d/39402250758.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_off0000f55b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF55B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010d6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D6D 17076 bytes
SHA-256: 8c56d9e3d209eaacacb8f53dc6cdbb0a7186f36535fa55524379d6c104bc36ef
font_02_sfnt_off000139f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x139F0 10348 bytes
SHA-256: ddd3dfa505f5149a967234fdb3b54019ba2cb333bffb244e1b827e3ecdde02c0

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