Malicious PDF — malware analysis report

Static analysis result for SHA-256 4d3af8fb664a7481…

MALICIOUS

PDF

83.9 KB Created: 2021-09-20 04:09:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 93f8576a4e45987ee8b68990a3a83768 SHA-1: dd4172b1ab5d64922b203013438c4d5f0a3cc082 SHA-256: 4d3af8fb664a7481d31a34fd43a5374aeb401f7c7190e1570c271722b2c7f927
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links, many pointing to compromised WordPress sites and disposable hosting, suggesting it functions as a link farm. These links likely lead to phishing pages or further malware downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://garglob.ru/uplcv?utm_term=mi+mix+2s+android+11 PDF link annotation
    • https://www.tonygssoulfood.com/wp-content/plugins/super-forms/uploads/php/files/59492e6a9a3a732ddfd7f8a8780b7812/92529326773.pdfIn PDF document text
    • http://inciboya.com/resimler/site/files/kabaz.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/125b7e2hieie72meaf2ru2c7b2/zunekenoxixovoj.pdfIn PDF document text
    • https://stormester.no/files/file/jiwitusajiwuxulifesiwuf.pdfIn PDF document text
    • http://le-nora.com/userfiles/file/65724526349.pdfIn PDF document text
    • http://parentini.it/userfiles/files/katozubokodawutuj.pdfIn PDF document text
    • http://emilybarnes.com/DEVELOPMENT/VERSIONED/emilybarnes/trunk/sites/default/files/file/buwaduxuti.pdfIn PDF document text
    • http://speckletrack.com/update/editor/file/jiluwiga.pdfIn PDF document text
    • http://dasbluemchen.com/buniwetejuruwupusasakebib.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/16141c95452cec---wominokotowojodagabalo.pdfIn PDF document text
    • https://laneopx.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614390e89defd---lasajeronukuzadezujobe.pdfIn PDF document text
    • http://pet.nfe.go.th/m_site/ckfinder/userfiles/files/pukisisalazotozejinobap.pdfIn PDF document text
    • http://ahxxzx.com/userfiles/202109/file/jelujipuninewebidav.pdfIn PDF document text
    • http://saeronbio.com/userData/board/file/92256588657.pdfIn PDF document text
    • http://hzqljsj.com/images/upload/File/zefulimolate.pdfIn PDF document text
    • http://brighterhealthcare.co.uk/wp-content/plugins/super-forms/uploads/php/files/lj399dlvok1so2c5hmm9tavnb0/fokomupuja.pdfIn PDF document text
    • http://alexandersorokolaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/60442303533.pdfIn PDF document text
    • http://geometramaurotozzi.it/userfiles/files/25229264732.pdfIn PDF document text
    • http://psystems.gr/Administrator/uploads/userpics/OutPostImages/files/fimuxewobale.pdfIn PDF document text
    • https://atasuorganiktarim.com/upload/ckfinder/files/josep.pdfIn PDF document text
    • https://ecohort.biz/userfiles/files/90605467432.pdfIn PDF document text
    • http://rabotatver.ru/userfiles/admin/bakulinuzerilogefinot.pdfIn PDF document text
    • https://dipinkrishna.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141462538938---74276273845.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_off0000e5b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5B0 17264 bytes
SHA-256: 73f3a6e6f01f13c9300b776c99898c33f60a5dddc2eddf59b75625cd028645e8
font_01_sfnt_off0001126a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1126A 10400 bytes
SHA-256: b09b4ac522c6ae5c658ff831a3aca9c05b577c6360f9c682dfc1c9524ff69d38
font_02_sfnt_off000129f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129F9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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