Malicious PDF — malware analysis report

Static analysis result for SHA-256 31336bd0ee5efcf1…

MALICIOUS

PDF

76.3 KB Created: 2021-09-02 12:57:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: 93046e90abfe0dce5087c61661be502c SHA-1: 38fb97147fb4f4f1beb4980ea7a9ead40c7c4d92 SHA-256: 31336bd0ee5efcf1b853ef0b68bf267737197f14b9d45188c5e8b77dfe01e191
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by a machine learning classifier and ClamAV. It contains a large number of links, many pointing to compromised WordPress upload directories and disposable hosting, indicating it functions as a link farm. The primary purpose appears to be redirecting users to malicious sites, likely for phishing or to download further malware, aligning with the characteristics of a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://keramann.ru/uploads/files/pududifiwexidigujedoxodep.pdf In PDF document text
    • https://sdyh.gr/wp-content/plugins/super-forms/uploads/php/files/ln2ea78ma0416eduvk3fr8ji11/naruxiponezulenopoturev.pdfIn PDF document text
    • https://best-turbos.com/wp-content/plugins/super-forms/uploads/php/files/34a93640bdb07517b417699bf4fd0c27/4544939190.pdfIn PDF document text
    • https://pet-fashion.ro/mm/file/17140521470.pdfIn PDF document text
    • http://cadeco.com/testingsites/advantage_aviation/assets/media/file/9359696233.pdfIn PDF document text
    • https://evenimentecastel.ro/wp-content/plugins/super-forms/uploads/php/files/b8jkk2nbq8n8kvirro80t1jiur/3546645541.pdfIn PDF document text
    • https://phase1acoustics.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8617636b9a---lipaforemureberowef.pdfIn PDF document text
    • http://csc0351.com/userfiles/file/20210714034945_pdi4vj.pdfIn PDF document text
    • http://www.cbs-emballages.com/upload/file/lafususoko.pdfIn PDF document text
    • http://18554080.com/userfiles/file/ruzasinotorosaraf.pdfIn PDF document text
    • https://1sis.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c06d354441---rinikelupaf.pdfIn PDF document text
    • http://blog.crowdly.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077dc89596a0---terejobum.pdfIn PDF document text
    • https://thewentworthco.com/wp-content/plugins/super-forms/uploads/php/files/a013ddn9kljd9040g3d9t8jesm/zuribalalumikem.pdfIn PDF document text
    • http://interno-kazan.ru/upload/files/xiroxosilozaxijosumipup.pdfIn PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/63534c237b45c8fa9f17fabf96a395d6/wavureluxepepizigagulud.pdfIn PDF document text
    • http://ranaghatpchsschool.org/userfiles/file/vesivazinafa.pdfIn PDF document text
    • https://vivekanandbawwa.com/userfiles/file/fevituvefoxopoxizu.pdfIn PDF document text
    • http://fabtur.ru/upload/files/49407669295.pdfIn PDF document text
    • http://ketnoikienthuc.com/upload/files/92431418867.pdfIn PDF document text
    • http://ahcxdq.com/uploads/file/030601473153.pdfIn PDF document text
    • http://bebsulmare.com/userfiles/files/30718989443.pdfIn PDF document text
    • http://www.danvillern.com/wp-content/plugins/super-forms/uploads/php/files/sc0qqgok8v60qd8se7om9ceqi6/rewowerunomox.pdfIn PDF document text
    • http://slmj8.com/data/userfiles/files/63318797782.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=t+lymphocytes+types+pdfPDF 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c93b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC93B 16512 bytes
SHA-256: 396d218010eddc873376b855213b04b94aeebc6a3ec65c0f7b28bcaa434927f9
font_01_sfnt_off0000f379.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF379 10504 bytes
SHA-256: 73cba0ddf9a89944323ae2b7abe5ac8ea4d9039c86e07ff5109071be259af6d3
font_02_sfnt_off00010b70.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B70 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.