Malicious PDF — malware analysis report

Static analysis result for SHA-256 67b2cdd2a6ffc275…

MALICIOUS

PDF

78.9 KB Created: 2021-09-14 07:05:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: e55b78361799e8f01e87ba7316abc625 SHA-1: f2ce4880b6a12a6d23334278432e020cee036e5f SHA-256: 67b2cdd2a6ffc275167c90aa5e2a33db4542458384c653f3c7d0cb94f982896f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links to external websites, many of which are hosted on compromised or disposable domains, indicating a link farm designed to lead users to malicious content. The ClamAV detection and ML classifier strongly suggest this PDF is a phishing trojan. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 http://arkystudio.eu/userfiles/files/godegus.pdf In PDF document text
    • http://nuraski.pl/wsg/userfiles/samaduxuwupur.pdfIn PDF document text
    • https://www.allterra.group/wp-content/plugins/super-forms/uploads/php/files/33cf7a5352b48c7f7dc05f59a5b758ea/lozosusisifobovedopis.pdfIn PDF document text
    • https://eduinfinite.com/wp-content/plugins/super-forms/uploads/php/files/800ae0417056ddcc7cd6fc4bc6977518/83473185597.pdfIn PDF document text
    • http://leeandrewdavison.com/download/51457406838.pdfIn PDF document text
    • http://kyochonbuenapark.iorderfoods.com/uploads/files/24743416586.pdfIn PDF document text
    • http://ardennes.proximeo.com/ckfinder/userfiles/files/66621033228.pdfIn PDF document text
    • https://tonerihned.cz/userfiles/file/97682221058.pdfIn PDF document text
    • https://samsungklima.net/upload/ckfinder/files/sudejibamorodefaduto.pdfIn PDF document text
    • https://immo-cjeanpaul.lu/userfiles/files/xidiwojojele.pdfIn PDF document text
    • http://jindi2010.com/uploadfile/files/vujizuvowogiw.pdfIn PDF document text
    • https://renetravel.ro/images/files/72316578334.pdfIn PDF document text
    • http://www.majorisinvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16138c33db1c70---95679493890.pdfIn PDF document text
    • http://elcampoeco.org/FCKeditor/file/47895778618.pdfIn PDF document text
    • http://salonorganica.ru/upload/files/17149643835.pdfIn PDF document text
    • https://spacio.hk/attachment/file/jofubozasog.pdfIn PDF document text
    • https://asaptransfers.co.uk/wp-content/plugins/super-forms/uploads/php/files/67a2cd2c5610d50279fc4f78e4315c91/41186213085.pdfIn PDF document text
    • http://otworz-biuro-podrozy.pl/userfiles/file/kazope.pdfIn PDF document text
    • https://gamma-electronics-eg.com/userfiles/files/29275679415.pdfIn PDF document text
    • https://k-kompany.ru/wp-content/plugins/super-forms/uploads/php/files/2b0312aa9effa754d983a7e6e9a38222/21785177139.pdfIn PDF document text
    • https://jgranit.pl/userfiles/file/rovatozisogaviwerixilaluk.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=sdcard+android+dataPDF link annotation
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000bab1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBAB1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d2c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2C2 17828 bytes
SHA-256: 9bd840e38ca724e0f7add454c8dc7fb71ec8708ddb0d9b64c91e59f29ffb0f91
font_02_sfnt_off0000ee2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE2F 10092 bytes
SHA-256: 0bdf4e1f00c32218c6a4391c56eef9743a5bc22e27c9ee600fb5abf3eb38ff4d
font_03_sfnt_off000104c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104C0 15940 bytes
SHA-256: 36a03d6b8851c3541dfa2bd2fe61367861b591abfa1a008d715a4363709e5979