Malicious PDF — malware analysis report

Static analysis result for SHA-256 83b070a193288d39…

MALICIOUS

PDF

73.0 KB Created: 2021-07-31 10:48:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 3cb82e13797cc8bb6d69dbd7ffaa4f0d SHA-1: 5a261492eb263c3c8b6021e9448a800def3c5b09 SHA-256: 83b070a193288d395c5b19cdad8bfcc217cfc7b90c4b578ac65338b5526ccbc8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links, many pointing to compromised WordPress sites, indicating a link farm designed to lead users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://atrax.eu/userfiles/file/86656320632.pdf
    • https://monarchwinemerchants.com/wp-content/plugins/super-forms/uploads/php/files/517379b82ebc15c341e9156d53eabb5f/vazadojevakevipixi.pdf
    • http://nek.ua/wp-content/plugins/formcraft/file-upload/server/content/files/160aea8b464df7---tafepuwojasiju.pdf
    • https://www.albispanaderia.com/wp-content/plugins/super-forms/uploads/php/files/041a694a87eab3b0281dc210aad8ab2f/27464570404.pdf
    • http://www.champcaregivers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e7fc77eddb---noxepaj.pdf
    • http://palakkadtourism.in/ckfinder/userfiles/files/bukowudapasof.pdf
    • http://www.unidacardoso.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609ec4b60f2b9---37887630878.pdf
    • http://trenermichal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160fd2b8bb3c14---lugunudut.pdf
    • http://www.next-conseil.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16082cb626b520---gelade.pdf
    • https://hanedantoptan.com/upload/files/sojubekakilizexawebasa.pdf
    • http://contua.org/userfiles/file/58384198012.pdf
    • http://fairview58.org/clients/b/b5/b5cf5456a34e3fefef15e35162a7177a/File/30861594335.pdf
    • http://blesk-stroy.ru/userfiles/files/pojakixa.pdf
    • https://pluckywize.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073a336dab13---tixanusemesatu.pdf
    • http://rentbucharest.net/images/userfiles/narigowileregupivinupetez.pdf
    • https://www.lesson-online.org/wp-content/plugins/super-forms/uploads/php/files/2l7fhiafak6hkng3q560ki7tv1/46502242556.pdf
    • https://alate.org/admin/fckeditor/editorfile/34389637292.pdf
    • https://www.llgnjinc.com/wp-content/plugins/super-forms/uploads/php/files/cb0eccf922ce740e4001ac11c5f219f8/kobeg.pdf
    • https://youstore21.com/wp-content/plugins/super-forms/uploads/php/files/e12fd4af0c37a375bce4bd5a46aad82d/32972988670.pdf
    • https://www.medicalart.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160acb798e057b---40488970290.pdf
    • https://amenagementsoleil.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca8f639149---20081673470.pdf
    • https://mmszke.hu/files/file/34132302967.pdf
    • http://rusiuojigalvoji.lt/wp-content/plugins/formcraft/file-upload/server/content/files/160c6a60654b33---vijikuronu.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=where+is+the+serial+number+on+a+kenmore+refrigerator
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000bd86.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xBD86 16792 bytes
font_01_sfnt_off0000d598.bin
4c71794e0913cbaccf8e284b388d7d1ee807efa016002f527b3888d1ee2ed135
pdf-font-stream PDF embedded font (sfnt) at offset 0xD598 15448 bytes
font_02_sfnt_off0000fd1d.bin
90f611ad0732de74191db71c637fd730755216b1481546516260b5288cd43f6b
pdf-font-stream PDF embedded font (sfnt) at offset 0xFD1D 10984 bytes