Malicious PDF — malware analysis report

Static analysis result for SHA-256 e892857d744175f6…

MALICIOUS

PDF

92.5 KB Created: 2021-07-29 18:22:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 8d194aab66ead410aea6f9da6aaad2ae SHA-1: daaea4d42cc61aadbbeb2752d397b578b38c2601 SHA-256: e892857d744175f6c2b81a227bd9de2ca88c99248fa32355c97d5ca2d2a648ac
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1553.005 Security Software Installation

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV detecting it as a phishing trojan. The document contains numerous links, many pointing to compromised CMS uploads or disposable hosting, suggesting a link farm designed to distribute malicious content or phish users. Notably, it includes an instruction to disable security software, a high-risk indicator for malicious documents.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Security software disable instruction high SE_SECURITY_BYPASS
    Document instructs the user to disable antivirus or security software — unusual for ordinary documents and high-risk in an unsolicited file
  • 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://fiumevivo.it/userfiles/files/nofozurojetamil.pdf In PDF document text
    • http://ontheedgeofnow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a7eb1069f6---fivilajunezegaxodurex.pdfIn PDF document text
    • http://palenice.net/obrazky_clanky/file/41235293608.pdfIn PDF document text
    • http://turagent007.ru/userfiles/file/26459340057.pdfIn PDF document text
    • https://jgmurphy.com/wp-content/plugins/super-forms/uploads/php/files/df5539b88d9e70cec301e4886d1718b0/zekepunutum.pdfIn PDF document text
    • http://baanpowertrain.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aff142ebdf3---44547733562.pdfIn PDF document text
    • https://sellerflows.com/wp-content/plugins/super-forms/uploads/php/files/cc46c09bb5638c2749d21413dcb9b6ad/tebavipaz.pdfIn PDF document text
    • https://diedacorporation.net/freesiafiles/file/pujibezetawowetodamolu.pdfIn PDF document text
    • http://harasim.cz/uploaded/files/beturileda.pdfIn PDF document text
    • https://advancedbusiness.co/wp-content/plugins/super-forms/uploads/php/files/d5613f33ff51fcab9bdc265a20cdc402/26426895584.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/r32valail09f31mem8uevpjcg5/rubikivekufe.pdfIn PDF document text
    • https://gaseg.com/wp-content/plugins/super-forms/uploads/php/files/lbdg7tu3kmp0tcv803nq0u2ct5/75935282443.pdfIn PDF document text
    • http://njuhome.pl/ckfinder/userfiles/files/28653482592.pdfIn PDF document text
    • http://feach.ie/images/uploads/file/vopiwafe.pdfIn PDF document text
    • https://www.schroedersales.com/wp-content/plugins/super-forms/uploads/php/files/3fb76106b3376f53b4a22027e4e10cde/videp.pdfIn PDF document text
    • http://plenar.hr/wp-content/plugins/formcraft/file-upload/server/content/files/16090ce41d14e5---84891982589.pdfIn PDF document text
    • http://atdawnwelift.com/userfiles/file/duvufoburawasepo.pdfIn PDF document text
    • http://nesemlak.com/test/images/uploads/files/49875611718.pdfIn PDF document text
    • http://grafiport.com/userfiles/file/zilutitetegakaje.pdfIn PDF document text
    • https://sv-fin.ru/wp-content/plugins/super-forms/uploads/php/files/c2284e5a9ca76d9fc7c48d46821bd349/47314867329.pdfIn PDF document text
    • https://digireg.se/upload/sozututexivukapepibusuwer.pdfIn PDF document text
    • https://cedarcreeksauce.com/wp-content/plugins/super-forms/uploads/php/files/bae47ca32d8602dfb016ead2eda61349/toguvugavoxikamedebad.pdfIn PDF document text
    • https://christembassyromford.org/wp-content/plugins/super-forms/uploads/php/files/888d82f19fae92194ee918ce338ebbac/56359471406.pdfIn PDF document text
    • https://aquaprosmart.com/userfiles/files/tanupevurat.pdfIn PDF document text
    • http://heryeryesil.com/resimlerfiles/zewevugaruzujababoli.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=free+download+coreldraw+x8+full+crack+64+bitPDF 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_off0000f342.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF342 29460 bytes
SHA-256: 04135cddbd150a718fdd794f86888202d8b264395058d2d6c51df9dff3fbcd71
font_01_sfnt_off00012df6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DF6 11252 bytes
SHA-256: 6e0bd08efcbd9197559d40456dc855db28b48bdd33ca8a469e2ae6a4187d4a1f
font_02_sfnt_off00014894.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14894 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1