Malicious PDF — malware analysis report

Static analysis result for SHA-256 3a116145e0e66554…

MALICIOUS

PDF

73.0 KB Created: 2021-09-08 06:47:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: c4df87233d7e0630b8ff3703ffabbc9c SHA-1: 80e119e09f218585b5178febedb9f007c152da74 SHA-256: 3a116145e0e665549b4aeb1b1b39fd0adbb62a9de0f98457da155cad9b9cf815
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous external links, many pointing to compromised WordPress sites, suggesting a phishing or redirection scheme. The presence of a link farm on disposable hosting further supports this, as it's a common tactic for distributing malicious content or leading users to phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://wastran.ru/uplcv?utm_term=the+devil%27s+deception+talbis+iblis+pdf PDF link annotation
    • http://www.fattyweng.com.sg/wp-content/plugins/formcraft/file-upload/server/content/files/160ee6645edcb5---33053274753.pdfIn PDF document text
    • https://electrabicycles.pl/app/webroot/uploads/file/16216973138411.pdfIn PDF document text
    • http://amghanoi.com/images/ckeditor/files/pifeluzenatozonev.pdfIn PDF document text
    • http://smartwealthhk.com/userfiles/vixodetipiral.pdfIn PDF document text
    • https://patc.fr/imagesfile/89226187074.pdfIn PDF document text
    • https://topjobsnepal.com/ckfinder/userfiles/files/41268290340.pdfIn PDF document text
    • http://www.pattyn360.com/upload/forum/files/gipimegidolosubo.pdfIn PDF document text
    • https://northstarexecutivesearch.com/wp-content/plugins/super-forms/uploads/php/files/b55a7e87de385d87742f1138f95890e7/fapuxibojiluvo.pdfIn PDF document text
    • http://snap-drone.com/userfiles/file/viwoxelupekuzuriripega.pdfIn PDF document text
    • http://77owship.netsociality.com/upload/files/tizebokat.pdfIn PDF document text
    • http://99hospitalitygroup.com/ckfinder/userfiles/files/mugesutewurabajad.pdfIn PDF document text
    • https://www.movingwithmagna.com/wp-content/plugins/super-forms/uploads/php/files/69cf27af5e5ea024b9d12fd7bbe43d17/24886098939.pdfIn PDF document text
    • https://himarco.ir/basefile/himarcoir/files/paguxow.pdfIn PDF document text
    • http://www.oschouston.com/osc/wp-content/plugins/formcraft/file-upload/server/content/files/1606c9d7fec8e8---62731183426.pdfIn PDF document text
    • https://advancedcheckcashadvance.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077baa70fce7---tosub.pdfIn PDF document text
    • http://biondiairsystem.it/userfiles/files/zuwalugigirano.pdfIn PDF document text
    • http://spoanalyze.com/wp-content/plugins/super-forms/uploads/php/files/0b763a8dbc382fe94d20d938847b7078/9634528022.pdfIn PDF document text
    • http://www.kevinbrooks.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160847e945337a---xixowinavuxeligufadir.pdfIn PDF document text
    • http://www.peopleoftheheath.com/wp-content/plugins/formcraft/file-upload/server/content/files/160836875c91e5---dufajava.pdfIn PDF document text
    • https://fitnessrev.net/wp-content/plugins/super-forms/uploads/php/files/097cj17cge2q3gi99eekddt6v0/83879416722.pdfIn PDF document text
    • https://icoachyou.biz/images/ckeditor/files/foxibesozavonaxiv.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_off0000ba84.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA84 17148 bytes
SHA-256: dc0fa589d00f206f615980815ae2e36a32278e7a0e21d3555ef04129263f3dee
font_01_sfnt_off0000e5d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5D8 10820 bytes
SHA-256: 921b12d957178aa5b601d5f7e3a6160a3bcc5d1fa44abf7db065ec7de08340fd
font_02_sfnt_off0000fe94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE94 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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