Malicious PDF — malware analysis report

Static analysis result for SHA-256 33903349e6226432…

MALICIOUS

PDF

73.8 KB Created: 2021-09-02 00:05:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 3ec84cdf3fa73e04bf72bcb0712d86de SHA-1: eda6071b80f8077d031731b32a3d29496b112cf0 SHA-256: 33903349e6226432919ceff02a2910ad59469204e380c4efb52271465bc6ac18
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a link farm. It contains numerous URLs pointing to various websites, including those hosted on compromised CMS platforms, suggesting an attempt to redirect users to malicious content or phishing pages. The document's structure and the presence of multiple external links indicate a likely phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://philabc.ru/uplcv?utm_term=red+bumps+on+back+of+tongue+near+throat PDF link annotation
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/112a8fbac0f9ad2a0d37973005a6beda/beguxavi.pdfIn PDF document text
    • http://pericosrentcar.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1609835c947591---jawapoluvetibu.pdfIn PDF document text
    • http://vitalenzyme.com/uploads/fckupload/file/fosesoxodug.pdfIn PDF document text
    • http://gldbirdgel.com/user_img/files/delubinuboganazufitu.pdfIn PDF document text
    • https://appchecar.com/ckfinder/userfiles/files/63537976247.pdfIn PDF document text
    • http://mesamiesdallas.org/clients/e/ee/ee8f1390623de39be1ac2b47a321719d/File/21060495436.pdfIn PDF document text
    • http://villapellegrino.it/userfiles/files/jopufiwufitu.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/a8a20af4d1f0ba9b3094f519c4eff1f0/53536753272.pdfIn PDF document text
    • http://www.prieteniitehnicii.ro/documente/file/lififolarajirogi.pdfIn PDF document text
    • https://f1com.ge/wp-content/plugins/super-forms/uploads/php/files/99bb2019b6c1d2bda905de8c34d6f65c/vexoxewevuxixixinaxenin.pdfIn PDF document text
    • http://stallingreunion.com/clients/a/a3/a37dbb3dca22f8cb40f44de83fe48269/File/55846138250.pdfIn PDF document text
    • http://fitviewer.biz/files/file/35422197138.pdfIn PDF document text
    • http://officinedesign.it/userfiles/files/vijitewiwurezogopazer.pdfIn PDF document text
    • http://recamonde.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160713e3381e82---97678481680.pdfIn PDF document text
    • http://redfordunion70.com/clients/869360/File/zazax.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16104ca3d839c5---91166659041.pdfIn PDF document text
    • https://k-barrierfree.com/FileData/ckfinder/files/20210629_E8409093FF948C5F.pdfIn PDF document text
    • http://a1-automotivegroup.com/upload/files/89753525870.pdfIn PDF document text
    • https://imapcb.org/wp-content/plugins/super-forms/uploads/php/files/a98h59668h3lmccu30sl7v5387/47152757251.pdfIn PDF document text
    • https://www.blackandwhite-salon.com/wp-content/plugins/super-forms/uploads/php/files/2241b83bc15285492263fc4c03b5328d/vosarata.pdfIn PDF document text
    • http://studioprogettoarchitettura.eu/userfiles/files/15694168052.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_off0000be3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBE3F 16008 bytes
SHA-256: 43f23b370d331aed9149ee889cb55d095b99605a3638ce623ce28922f5d199b5
font_01_sfnt_off0000e715.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE715 11308 bytes
SHA-256: c1f74d51380d23523e947cf0208d768d4c60a24b58921b3084549cab883d5e50
font_02_sfnt_off00010114.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10114 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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